Relevant bibliographies by topics / Ultrafast charge dynamics

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Ultrafast charge dynamics'

Author: Grafiati
Published: 4 June 2021
Last updated: 4 February 2022

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Journal articles on the topic "Ultrafast charge dynamics"

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KIM, Kyungwan. "Investigation of Ultrafast Charge Carrier and Lattice Dynamics." Physics and High Technology 29, no. 9 (September 30, 2020): 7–10. http://dx.doi.org/10.3938/phit.29.030.

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When a material is driven out of an equilibrium state, fundamental interactions governing the material properties play roles in returning to the equilibrium state. The microscopic process of this recovery takes place on an ultrafast time scale far beyond the usual time resolution of usual detection methods. Thanks to the recent development of the ultrashort pulsed lasers, various ultrafast techniques are now available to investigate the ultrafast dynamics of materials. In this article, I briefly review the experiment techniques used to investigate ultrafast electronic and lattice dynamics.
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Ayuso, David, Alicia Palacios, Piero Decleva, and Fernando Martín. "Ultrafast charge dynamics in glycine induced by attosecond pulses." Physical Chemistry Chemical Physics 19, no. 30 (2017): 19767–76. http://dx.doi.org/10.1039/c7cp01856h.

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Photoionization of biomolecules upon interaction with an attosecond pulse leads to ultrafast charge fluctuations in the sub-femtosecond time scale. The ultrafast charge migration process in glycine, resulting from the coherent superposition of cationic states, is described using the time-dependent static-exchange DFT method.
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Chábera, Pavel, Lisa A. Fredin, Kasper S. Kjær, Nils W. Rosemann, Linnea Lindh, Om Prakash, Yizhu Liu, et al. "Band-selective dynamics in charge-transfer excited iron carbene complexes." Faraday Discussions 216 (2019): 191–210. http://dx.doi.org/10.1039/c8fd00232k.

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Grigioni, Ivan, Annalisa Polo, Maria Vittoria Dozzi, Lucia Ganzer, Benedetto Bozzini, Giulio Cerullo, and Elena Selli. "Ultrafast Charge Carrier Dynamics in CuWO4 Photoanodes." Journal of Physical Chemistry C 125, no. 10 (March 4, 2021): 5692–99. http://dx.doi.org/10.1021/acs.jpcc.0c11607.

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Pattengale, Brian, and Jier Huang. "Photoinduced interfacial charge separation dynamics in zeolitic imidazolate framework." Physical Chemistry Chemical Physics 20, no. 21 (2018): 14884–88. http://dx.doi.org/10.1039/c8cp02078g.

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Xiang, Tian, Liang Cheng, and Jing-Bo Qi. "Ultrafast charge and spin dynamics on topological insulators." Acta Physica Sinica 68, no. 22 (2019): 227202. http://dx.doi.org/10.7498/aps.68.20191433.

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Born, Brandon, Jeffrey D. A. Krupa, Simon Geoffroy-Gagnon, Ilija R. Hristovski, Christopher M. Collier, and Jonathan F. Holzman. "Ultrafast Charge-Carrier Dynamics of Copper Oxide Nanocrystals." ACS Photonics 3, no. 12 (December 8, 2016): 2475–81. http://dx.doi.org/10.1021/acsphotonics.6b00717.

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Lanzafame, Joseph M., R. J. Dwayne Miller, Annabel A. Muenter, and Bruce A. Parkinson. "Ultrafast charge-transfer dynamics at tin disulfide surfaces." Journal of Physical Chemistry 96, no. 7 (April 1992): 2820–26. http://dx.doi.org/10.1021/j100186a008.

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Kime, Georgia, Marina A. Leontiadou, Jack R. Brent, Nicky Savjani, Paul O’Brien, and David Binks. "Ultrafast Charge Dynamics in Dispersions of Monolayer MoS2Nanosheets." Journal of Physical Chemistry C 121, no. 40 (September 28, 2017): 22415–21. http://dx.doi.org/10.1021/acs.jpcc.7b05631.

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10

Köhler, Juliane, Tatjana Quast, Johannes Buback, Ingo Fischer, Tobias Brixner, Patrick Nuernberger, Barbara Geiß, Julian Mager, and Christoph Lambert. "Ultrafast charge-transfer dynamics of donor-substituted truxenones." Physical Chemistry Chemical Physics 14, no. 31 (2012): 11081. http://dx.doi.org/10.1039/c2cp41061c.

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Dissertations / Theses on the topic "Ultrafast charge dynamics"

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Al, Otaify Ali Abdullah. "Ultrafast charge dynamics in novel nanoparticles." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/ultrafast-charge-dynamics-in-novel-nanoparticles(ec75ab4e-71cd-4051-8683-be3c724746c5).html.

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The ultrafast charge dynamics in a number of nanostructured materials relevant to the production of renewable energy are investigated using ultrafast transient absorption spectroscopy. The materials include mercury telluride and cadmium mercury telluride quantum dots, and gold nanoparticles loaded on titanium dioxide colloidal spheres. The analysis of the resultant pump-induced transmittance change spectra and transients allow the determination of charge relaxation routes including multiple exciton generation, trion formation and direct-surface trapping. The investigation of HgTe QDs passivated with thioglycerol, mercaptopropionic acid and dodecanethiol ligands suggests that mercaptopropionic acid ligand results in better passivation of HgTe QDs due to its carboxylic acid group. It allows more electron density donation to the QD surface to passivate the traps related with unsaturated Hg bonds and hence supresses the associated non-radiative processes. The decay lifetimes of the thioglycerol/dodecanethiol-capped QDs in addition to the photo-induced absorption feature in their spectra, are found to be consistent with surface charge trapping observed in CdSe QDs. In comparison, the transients obtained for mercaptopropionic acid passivated QDs coupled with the pump-induced transmittance change spectrum show no sign of any surface-related processes. Therefore, our analyses allow the determination of multiple exciton generation for the first time in these QDs with a quantum yield of 1.36 ± 0.04 when photo-exciting with photons of energy 3.1 times the band gap. Such result should turn researchers’ attention to those ligands which could improve the QD solar cell field. The study of exciton dynamics in CdxHg(1-x)Te alloy QDs is also presented here. Their pump-induced transmittance change spectrum show two bleaches: at the shoulder position of the steady state absorption and at the PL peak. The exciton dynamics of these materials are studied using four different wavelengths, two of them are above the MEG threshold. The resultant transmittance transients and the pump-induced transmittance change spectrum are free of any photo-induced absorption or long-lived surface trapping. Hence, the decay of the transients obtained above the MEG threshold for well-stirred samples at low pump fluences is attributed to biexciton recombination. The assessment of multiple exciton generation reveals a quantum yield value of 1.12 ± 0.01 when photo-exciting with 2.6 times the band gap. Finally, the investigation of the recovery of the plasmon bleach in TiO2 colloidal spheres decorated with different sizes of Au NPs is presented in this thesis. The pump-induced transmittance change spectra obtained for two different wavelengths show bleaches at the plasmon band maximum superimposed with two wings of absorption features at shorter and longer wavelengths. The resultant transmittance transients for these samples are well-described by bi-exponential decay with a very quick decline of a few ps associated with electron–phonon scattering, followed by a slower decay over a few 10s of ps associated with heat dissipation. Only the heat dissipation rate is found to be dependent on the size of the Au NPs as it rises from 49 ± 3 ps to 128 ± 6 ps when the diameter of the Au NPs is increased from 12.2 ± 2.2 nm to 24.5 ± 2.8 nm, respectively.
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Lambright, Scott. "Ultrafast Charge Carrier Dynamics in Au/Semiconductor Nanoheterostructures." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1404741549.

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3

Cadirci, Musa. "Ultrafast charge dynamics in novel colloidal quantum dots." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/ultrafast-charge-dynamics-in-novel-colloidal-quantum-dots(865aba90-9d60-478d-8f49-ad4785516688).html.

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In this thesis ultrafast exciton dynamics of several colloidal quantum dots have been studied using visible transient absorption spectroscopy. The resultant transient decays and differential transmission spectra were analysed to determine the ultrafast relaxation channels, multiple exciton generation (MEG) efficiency and multi-exciton interactions in the observed materials. All QDs were preliminarily optically characterized using steady state absorption and photoluminescence spectroscopies. In addition, a high repetition infrared femtosecond pump probe experiment was designed and built to detect the picosecond intraband carrier relaxations in quantum dots. Picosecond carrier dynamics of type-II ZnTe/ZnSe and of CuInSe2 and CuInS2 type-I quantum dots were investigated. The common feature of these materials is that they are eco-friendly materials, being alternatives to the toxic Cd- and Pb- based materials. It was found that surface trapping occurred in both cases for electrons in the hot states, and in the minimum of the conduction band for ZnTe/ZnSe core/shell materials. Trion formation was observed in ZnTe/ZnSe core/shell dots at high power and unstirred conditions. The hot and cold electron trapping processes in type-II dots and CuInS2 and CuInSe2 dots shifted, distorted and moderately cancelled the bleach features. In addition, intra-gap hole trapping was observed in CuInS2 and CuInSe2 dots which results in a long decay feature in the recorded transients. MEG competes with Auger cooling, surface mediated relaxation and phonon emission. To enhance the MEG quantum yield, the rival mechanisms were suppressed in well-engineered CdSe/CdTe/CdS and CdTe/CdSe/CdS core/shell/shell and CdTe/CdS core/shell type-II quantum dots. The MEG slope efficiency and threshold for a range of different core size and shell thickness were found to be (142±9)%/Eg and (2.59±0.16)Eg, respectively. The observed threshold was consistent with the literature, whereas, the obtained slope efficiency was about three times higher than the previously reported values. The biexciton interaction energy of the dots stated in the previous paragraph was also studied. To date, time-resolved photoluminescence (TRPL) has been employed to study exciton interactions in type-II quantum dots and large repulsive biexciton interaction energy values between 50-100 meV have been reported. However, unlike the TRPL method, the TA experiment ensures that only two excitons remain in the band edge of the dot. Using this method, large attractive biexciton interaction energies up to ~-60 meV was observed. These results have promising implications regarding enhancing the MEG quantum yield.
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Peckus, Domantas. "Ultrafast exciton and charge carrier dynamics in nanostructured molecular layers." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2013. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2013~D_20131220_150447-81409.

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Due to their unique properties organic semiconductors may be used for various applications in organic optoelectronic devices: light emitting devices, lasers, field-effect transistors, photovoltaic cells and etc. Despite high perspectives of organic semiconductors they are still upstaged by their inorganic counterparts. Development of organic electronics requires better understanding of electrooptical properties of organic semiconductors and relationships between their structure and functions. The main goal of this thesis is a detailed investigation of ultrafast exciton and charge carrier processes in pure organic semiconductors and their blends with fullerene derivatives. Investigated organic or silicon organic semiconductors were poly-di-n-hexylsilane (PDHS), polyfluorenes F8BT and PSF-BT, merocyanine MD376. C60 fullerene and its derivative PCBM were used in blends. Ultrafast transient absorption, fluorescence, and integral mode photocurrent measurements were used for investigations. The investigation of PDHS nanocomposites revealed that PDHS incorporation into nanopores can be used for improvement of fluorescence properties. Formation of intramolecular charge transfer state was proposed for PSF-BT neat films. Charge transfer scheme of the formation of long-lived charge pair state in PSF-BT/PCBM blend was presented. The charge pair and free charge carrier generation scheme in merocyanine blends with fullerene derivatives were discussed in detail. Analysis of measurement... [to full text]
Dėl savo unikalių savybių organiniai puslaidininkiai gali būti plačiai pritaikyti įvairiuose optoelektroniniuose prietaisuose: organiniuose šviestukuose, organiniuose lazeriuose, organiniuose tranzistoriuose ir organiniuose šviesos elementuose. Visi šie pritaikymai yra galimi dėl organinių molekulių laidumo. Nepaisant didelių organinių puslaidininkių perspektyvų, jie vis dar yra nukonkuruojami neorganinių puslaidininkių. Pagrindinis šių tezių tikslas yra detaliai ištirti eksitonų ir krūvininkų dinamikos procesus grynuose organiniuose puslaidininkiuose ir jų mišiniuose su fulereno dariniais. Buvo matuoti organiniai ir silicio organiniai puslaidininkiai: poli-di-n-heksilsilanas (PDHS), polifluoreno dariniai F8BT ir PSF-BT, merocianinas MD376. Mišiniuose naudoti fulerenai buvo C60 ir jo darinys PCBM. Tyrimams buvo naudoti ultraspartūs skirtuminės sugerties, fluorescencijos ir integralinės fotosrovės matavimai. PDHS tyrimai atskleidė, kad neorganinės matricos sumažina nespindulinį relaksacijos kanalą. PDHS nanokompozitai gali būti naudojami polimero fluorescencijos savybių: stabilumo, kvantinio našumo pagerinimui. Polifluorenų F8BT ir PSF-BT grynų plėvelių tyrimų metu nustatyti eksitonų-eksitonų anihiliacijos ir eksitonų migracijos skirtumai. Vidumolekulinės krūvio pernašos būsenos formavimasis buvo pasiūlytas PSF-BT grynoms plėvelėms. Pristatyta ilgi gyvuojančių krūvininkų porų formavimosi schema PSF-BT/PCBM mišiniuose. Krūvio pernašos būsenų formavimasis buvo ištirtas... [toliau žr. visą tekstą]
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Rivett, Jasmine Pamela Helen. "Charge carrier dynamics of lead halide perovskites probed with ultrafast spectroscopy." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/275095.

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In this thesis, we investigate the nature of charge carrier generation, relaxation and recombination in a range of lead halide perovskites. We focus on understanding whether the photophysical behaviour of these perovskite materials is like that of highly-ordered inorganic crystalline semiconductors (exhibiting ballistic charge transport) or disordered molecular semiconductors (exhibiting strong electron-phonon coupling and highly localised excited states) and how we can tune these photophysical properties with inorganic and organic additives. We find that the fundamental photophysical properties of lead halide perovskites, such as charge carrier relaxation and recombination, arise from the lead halide lattice rather than the choice of A-site cation. We show that while the choice of A-site cation does not affect these photophysical properties directly, it can have a significant impact on the structure of the lead halide lattice and therefore affect these photophysical properties indirectly. We demonstrate that lead halide perovskites fabricated from particular inorganic and organic A-site cation combinations exhibit low parasitic trap densities and enhanced carrier interactions. Furthering our understanding of how the photophysical properties of these materials can be controlled through chemical composition is extremely important for the future design of highly efficient solar cells and light emitting diodes.
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Tiwana, Priti. "Ultrafast charge dynamics in mesoporous materials used in dye-sensitized solar cells." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:ba3cbbce-3119-4043-a499-c0ca74287d42.

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This thesis is concerned with measuring ultrafast electron dynamics taking place in dye-sensitized mesoporous semiconductor films employed as working electrodes in dye-sensitized solar cells (DSCs). An understanding of these ultrafast charge transfer mechanisms is essential for designing efficient photovoltaic (PV) devices with high photon-to-current conversion efficiency. Optical-pump terahertz-probe (OPTP) spectroscopy is a sub-picosecond resolution, non-contact, photoconductivity measurement technique which can be used to directly measure charge carrier dynamics within nanostructured materials without the need for invoking complex modelling schemes. A combination of OPTP and photovoltaic measurements on mesoporous TiO2 films show an early-time intra-particle electron mobility of 0.1 cm2/(Vs). This value is an order of magnitude lower than that measured in bulk TiO2 and can be partly explained by the restricted electron movement because of geometrical constraints and increased trap sites in the nanostructured material. In addition, the mesoporous film behaves like a nanostructured composite material, with the TiO2 nanoparticles embedded in a low dielectric medium (air or vacuum), leading to lower apparent electron mobility. THz mobility measured in similar mesoporous ZnO and SnO2 films sensitized with the same dye is calculated to be 0.17 cm2/(Vs) for ZnO and 1.01 cm2/(Vs) for SnO2. Possible reasons for the deviation from mobilities reported in literature for the respective bulk materials have been discussed. The conclusion of this study is that while electron mobility values for nanoporous TiO2 films are approaching theoretical maximum values, both intra- and inter-particle electron mobility in mesoporous ZnO and SnO2 films offer considerable scope for improvement. OPTP has also been used to measure electron injection rates in dye-sensitized TiO2, ZnO and SnO2 nanostructured films. They are seen to proceed in the order TiO2 >SnO2 >ZnO. While the process is complete within a few picoseconds in TiO2/Z907, it is seen to extend beyond a nanosecond in case of ZnO. These measurements correlate well with injection efficiencies determined from DSCs fabricated from identical mesoporous films, suggesting that the slow injection components limit the overall solar cell photocurrent. The reasons for this observed difference in charge injection rates have been explored within. It is now fairly common practice in the photovoltaic community to apply a coating of a wide band-gap material over the metal-oxide nanoparticles in DSCs to improve device performance. However, the underlying reasons for the improvement are not fully understood. With this motivation, OPTP spectroscopy has been used to study how the conformal coating affects early-time mechanisms, such as electron injection, trapping or diffusion length. The electron injection process is unaffected in case of TiCl4-treated TiO2 and MgO-treated ZnO, while it becomes much slower in case of MgO-treated SnO2. Finally, a light-soaking effect observed in SnO2-based solid-state DSCs has been examined in detail using THz spectroscopy and transient PV measurement techniques. It is concluded that continued exposure to light results in a rearrangement of charged species at the metal-oxide surface. This leads to an increase in the density of acceptor states or a lowering of the SnO2 conduction band edge with respect to the dye excited state energy level, ultimately leading to faster electron transport and higher device photocurrents.
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Prince, Beth Marie. "Vibrational dynamics of excited states probed by fs/ps CARS simulations and applications to ultrafast charge transfer dynamics /." [Ames, Iowa : Iowa State University], 2008.

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8

Erasmus, Nicolas. "Ultrafast structural dynamics in 4Hb-TaSe2 observed by femtosecond electron diffraction." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/79934.

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Thesis (PhD)--Stellenbosch University, 2013.
ENGLISH ABSTRACT: In this thesis the structural dynamics, upon photo-excitation, of the charge-densitywave (CDW) material 4Hb-TaSe2 is investigated on the time-scale of atomic motion and simultaneously on the spatial-scale of atomic dimensions. CDW materials have been of interest since their discovery in the 1970’s because of their remarkable non-linear and anisotropic electrical properties, gigantic dielectric constants, unusual elastic properties and rich dynamical behaviour. Some of these exotic properties were extensively investigated in thermal equilibrium soon after their discovery but only recently have ultrafast techniques like femtosecond spectroscopy become available to study their out-of-equilibrium behaviour on the time-scale of atomic motion. By studying their behaviour on this time-scale a more in-depth understanding of their macroscopic properties can be gained. However, to do investigations on the atomic time-scale and simultaneously directly observe the evolution of the atomic arrangements is another challenge. One approach is through the previously mentioned technique of femtosecond pump-probe spectroscopy but converting the usual ultrashort optical probing source to an ultrashort electron or x-ray source that can diffract off the sample and reveal structural detail on the atomic level. Here, the femto-to-picosecond out-of-equilibrium behaviour upon photo-excitation in 4Hb-TaSe2 is investigated using an ultrashort electron probe source. Two variations of using an electron probe source are used: conventional scanning Femtosecond Electron Diffraction (FED) and a new approach namely Femtosecond Streaked Electron Diffraction (FSED). The more established FED technique, based on femtosecond pumpprobe spectroscopy, is used as the major investigating tool while the FSED technique, based on ultrafast streak camera technology, is an attempt at broadening the scope of available techniques to study structural dynamics in crystalline material on the subpicosecond time-scale. With these two techniques, the structural dynamics during the phase transition from the commensurate- to incommensurate-CDW phase in 4Hb-TaSe2 is observed through diffraction patterns with a temporal resolution of under 500 fs. The study reveals strong coupling between the electronic and lattice systems of the material and several time-constants of under and above a picosecond are extracted from the data. Using these time-constants, the structural evolution during the phase transition is better understood and with the newly gained knowledge, a model of all the processes involved after photo-excitation is proposed.
AFRIKAANSE OPSOMMING: In hierdie tesis word die strukturele dinamika van die lading-digtheid-golf (LDG) materiaal 4Hb-TaSe2 ondersoek op die tydskaal van atomiese bewegings en gelyktydig op die ruimtelikeskaal van atomiese dimensies. LDG materie is al van belang sedert hul ontdekking in die 1970’s as gevolg van hul merkwaardige nie-lineêre en anisotrope elektriese eienskappe, reuse diëlektriese konstantes, ongewone elastiese eienskappe en ryk dinamiese gedrag. Sommige van hierdie eksotiese eienskappe is omvattend ondersoek in termiese ewewig kort na hul ontdekking, maar eers onlangs is dit moontlik deur middle van ultravinnige tegnieke soos femtosekonde spektroskopie om hulle uit-ewewigs gedrag te bestudeer op die tydskaal van atomiese beweging. Deur die gedrag op hierdie tydskaal te bestudeer kan ’n meer insiggewende begrip van hul makroskopiese eienskappe verkry word. Om ondersoeke in te stel op die atomiese tydskaal en gelyktydig direk die evolusie van die atoom posisie te waarneem is egter ’n moeilike taak. Een benadering is deur middle van femtosekonde “pump-probe” spektroskopie maar dan die gewone optiese “probe” puls om te skakel na ’n electron of x-straal puls wat van die materiaal kan diffrak en dus strukturele inligting op die atomiese vlak kan onthul. Hier word die femto-tot-pico sekonde uit-ewewig gedrag in 4Hb-TaSe2 ondersoek met behulp van elektron pulse. Twee variasies van die gebruik van ’n elektron bron word gebruik: konvensionele “Femtosecond Electron Diffraction” (FED) en ’n nuwe benadering, naamlik, “Femtosecond Streaked Electron Diffraction” (FSED). Die meer gevestigde FED tegniek, wat gebaseer is op femtosekonde “pump-probe” spektroskopie, word gebruik as die hoof ondersoek metode terwyl die FSED tegniek, wat gebaseer is op die ultra vinnige “streak camera” tegnologie, ’n poging is om beskikbare tegnieke uit te brei wat gebruik kan word om strukturele dinamika in materie te bestudeer op die sub-picosekonde tydskaal. Met behulp van hierdie twee tegnieke, word die strukturele dinamika tydens die fase oorgang van die ooreenkomstige tot nie-ooreenkomstige LDG fase in 4Hb-TaSe2 deur diffraksie patrone met ’n tydresolusie van minder as 500 fs waargeneem. Die studie toon ’n sterk korrelasie tussen die elektroniese sisteem en kristalrooster. Verskeie tydkonstantes van onder en bo ’n picosekonde kon ook uit die data onttrek word en gebruik word om die strukturele veranderinge beter te verstaan. Hierdie nuwe kennis het ons in staat gestel om ’n model van al die betrokke prosesse voor te stel.
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Aytac, Yigit. "Time-resolved measurements of charge carrier dynamics in Mwir to Lwir InAs/InAsSb superlattices." Diss., University of Iowa, 2016. https://ir.uiowa.edu/etd/2039.

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All-optical time-resolved measurement techniques provide a powerful tool for investigating critical parameters that determine the performance of infrared photodetector and emitter semiconductor materials. Narrow-bandgap InAs/GaSb type-II superlattices (T2SLs) have shown great promise as next generation materials, due to superior intrinsic properties and versatility. Unfortunately, InAs/GaSb T2SLs are plagued by parasitic Shockley-Read-Hall recombination centers that shorten the carrier lifetime and limit device performance. Ultrafast pump-probe techniques and time-resolved differential-transmission measurements are used here to demonstrate that "Ga-free" InAs/InAs₁₋xSbx T2SLs and InAsSb alloys do not have this same limitation and thus have significantly longer carrier lifetimes. Measurements of unintentionally doped MWIR and LWIR InAs/InAs₁₋xSbx T2SLs demonstrate minority carrier (MC) lifetimes of 18.4 µs and 4.5 µs at 77 K, respectively. This represents a more than two order of magnitude increase compared to the 90 ns MC lifetime measured in a comparable MWIR and LWIR InAs/GaSb T2SL. Through temperature-dependent differential-transmission measurements, the various carrier recombination processes are differentiated and the dominant recombination mechanisms identified for InAs/InAs₁₋xSbx T2SLs. These results demonstrate that these Ga-free materials are viable options over InAs/GaSb T2SLs and potentially bulk Hg₁₋xCdxTe photodetectors. In addition to carrier lifetimes, the drift and diusion of excited charge carriers through the superlattice layers (i.e. in-plane transport) directly aects the performance of photo-detectors and emitters. All-optical ultrafast techniques were successfully used for a direct measure of in-plane diffusion coeffcients in MWIR InAs/InAsSb T2SLs using a photo-generated transient grating technique at various temperatures. Ambipolar diffusion coefficients of approximately 60 cm²/s were reported for MWIR InAs/InAs₁₋xSbxT2SLs at 293 K.
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Yong, Chaw Keong. "Ultrafast carrier dynamics in organic-inorganic semiconductor nanostructures." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:b2efdc6a-1531-4d3f-8af1-e3094747434c.

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This thesis is concerned with the influence of nanoscale boundaries and interfaces upon the electronic processes that occur within the inorganic semiconductors. Inorganic semiconductor nanowires and their blends with semiconducting polymers have been investigated using state-of-the-art ultrafast optical techniques to provide information on the sub-picosecond to nanosecond photoexcitation dynamics in these systems. Chapters 1 and 2 introduce the theory and background behind the work and present a literature review of previous work utilising nanowires in hybrid organic photovoltaic devices, revealing the performances to date. The experimental methods used during the thesis are detailed in Chapter 3. Chapter 4 describes the crucial roles of surface passivation on the ultrafast dynamics of exciton formation in gallium arsenide (GaAs) nanowires. By passivating the surface states of nanowires, exciton formation via the bimolecular conversion of electron-hole plasma can observed over few hundred picoseconds, in-contrast to the fast carrier trapping in 10 ps observed in the uncoated nanowires. Chapter 5 presents a novel method to passivate the surface-states of GaAs nanowires using semiconducting polymer. The carrier lifetime in the nanowires can be strongly enhanced when the ionization potential of the overcoated semiconducting polymer is smaller than the work function of the nanowires and the surface native oxide layers of nanowires are removed. Finally, Chapter 6 shows that the carrier cooling in the type-II wurtzite-zincblend InP nanowires is reduced by order-of magnitude during the spatial charge-transfer across the type-II heterojunction. The works decribed in this thesis reveals the crucial role of surface-states and bulk defects on the carrier dynamics of semiconductor nanowires. In-addition, a novel approach to passivate the surface defect states of nanowires using semiconducting polymers was developed.
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Books on the topic "Ultrafast charge dynamics"

1

Villy, Sundström, ed. Femtochemistry and femtobiology: Ultrafast reaction dynamics at atomic-scale resolution : Nobel Symposium 101. London: Imperial College Press, 1997.

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2

Yann, Gauduel, and Rossky Peter J, eds. Ultrafast reaction dynamics and solvent effects: Royaumont, France 1993. New York: American Institute of Physics, 1994.

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(Editor), Y. Gauduel, and P. J. Rossky (Editor), eds. Ultrafast Reaction Dynamics and Solvent Effects: Proceedings of the international Research Workshop, France, August 1993 (AIP Conference Proceedings). American Institute of Physics, 1998.

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Book chapters on the topic "Ultrafast charge dynamics"

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Perfetti, Luca, Tobias Kampfrath, Martin Wolf, and Christian Frischkorn. "Ultrafast Charge-Carrier Dynamics in Low-Dimensional Solids." In Ultrafast Phenomena XV, 612–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_197.

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Hynes, James T. "Charge Transfer Reactions and Solvation Dynamics." In Ultrafast Dynamics of Chemical Systems, 345–81. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0916-1_13.

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Manoj, P., Chang-Ki Min, C. T. Aravindakumar, and Taiha Joo. "Ultrafast Charge Transfer Dynamics of a Modified Double Helical DNA." In Ultrafast Phenomena XV, 540–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_175.

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Nicolet, Olivier, and Eric Vauthey. "Non-Equilibrium Charge Recombination Dynamics of Excited Donor-Acceptor Complexes." In Ultrafast Phenomena XIII, 432–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59319-2_134.

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Tamura, Hiroyuki, Keith H. Hughes, Rocco Martinazzo, Jan Wahl, Robert Binder, and Irene Burghardt. "Chapter 11 Ultrafast Energy and Charge Transfer in Functional Molecular Nanoscale Aggregates." In Ultrafast Dynamics at the Nanoscale, 407–36. Penthouse Level, Suntec Tower 3, 8 Temasek Boulevard, Singapore 038988: Pan Stanford Publishing, 2017. http://dx.doi.org/10.1201/9781315364599-12.

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Kang, I., S. Johnson, A. Lindenberg, R. Falcone, Th Missalla, P. Heimann, K. H. Kim, T. Katsufuji, and S.-W. Cheong. "Time-resolved x-ray measurements of polaron dynamics of charge-ordered Nd1/2Sr1/2MnO3." In Ultrafast Phenomena XII, 287–89. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56546-5_83.

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Vauthey, Eric. "Investigation of the Ultrafast Dynamics of Charge Recombination of Ion Pairs Using Multiplex Transient Grating Spectroscopy." In Ultrafast Phenomena XII, 485–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56546-5_142.

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Soavi, Giancarlo, Francesco Scotognella, Daniele Viola, Timo Hefner, Tobias Hertel, Guglielmo Lanzani, and Giulio Cerullo. "Ultrafast Charge Photogeneration and Dynamics in Semiconducting Carbon Nanotubes." In Springer Proceedings in Physics, 360–62. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13242-6_88.

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Cerullo, G., M. Nisoli, S. Stagira, S. De Silvestri, G. Lanzani, W. Graupner, E. J. W. List, and G. Leising. "Ultrafast Dynamics of Field-Induced Charge Generation in Conducting Polymers." In Springer Series in Chemical Physics, 304–6. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/978-3-642-72289-9_92.

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Bakulin, Artem A., Robert Lovrincic, Akshay Rao, Simon Gelinas, Yu Xi, Oleg Selig, Zhuoying Chen, Richard H. Friend, Huib J. Bakker, and David Cahen. "Ultrafast Optical Control of Charge Dynamics in Organic and Hybrid Electronic Nanodevices." In Springer Proceedings in Physics, 675–78. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-13242-6_166.

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Conference papers on the topic "Ultrafast charge dynamics"

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Mancal, Tomas, Niklas Christensson, Oliver Bixner, Vladimír Lukeš, Franz Milota, Harald F. Kauffmann, and Juergen Hauer. "Two-Dimensional Optical Spectroscopy of Charge Transfer." In International Conference on Ultrafast Structural Dynamics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/icusd.2012.im3d.3.

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Lange, Holger, Christian Strelow, Robert A. Barton, Octavi E. Semonin, Erik Busby, Matthew Sfeir, and Tony F. Heinz. "Charge Transfer Dynamics between Colloidal Nanocrystals and Graphene." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/up.2014.08.tue.e.2.

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Martin, Monique M., and Pascal Plaza. "Solvent controlled ultrafast intramolecular charge transfer and internal rotation." In Ultrafast reaction dynamics and solvent effects. AIP, 1994. http://dx.doi.org/10.1063/1.45396.

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Gessner, Julia Anthea, Florian Siegrist, Marcus Ossiander, Christian Denker, Yi-Ping Chang, Malte C. Schröder, Alexander Guggenmos, et al. "Ultrafast Charge and Spin Dynamics in Ferromagnets." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleo_qels.2020.ff1c.2.

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Sciaini, Germán, Maximilian Eichberger, Hanjo Schäfer, Marina Krumova, Markus Beyer, Helmuth Berger, Gustavo Moriena, Jure Demsar, and Dwayne Miller. "Femtosecond Electron Diffraction for the Study of Charge Density Waves." In International Conference on Ultrafast Structural Dynamics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/icusd.2012.it3d.2.

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Chandler, David, John N. Gehlen, and Massimo Marchi. "On the mechanism of the primary charge transfer in photosynthesis." In Ultrafast reaction dynamics and solvent effects. AIP, 1994. http://dx.doi.org/10.1063/1.45411.

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Soavi, Giancarlo, Francesco Scotognella, Daniele Viola, Timo Hefner, Tobias Hertel, Guglielmo Lanzani, and Giulio Cerullo. "Ultrafast charge photogeneration and dynamics in semiconducting carbon nanotubes." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2014. http://dx.doi.org/10.1364/up.2014.08.tue.p2.34.

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Völzer, Tim, Matthias Lütgens, Franziska Fennel, and Stefan Lochbrunner. "Ultrafast Charge Carrier Dynamics in Bulk MoS2 Following Optical Excitation." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/up.2016.uth4a.35.

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Manoj, P., Chang-Ki Min, Taiha Joo, and C. T. Aravindakumar. "Ultrafast Charge Transfer Dynamics of a Modified Double Helical DNA." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/up.2006.thd6.

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Nakashima, Satoru, Yutaka Nagasawa, Kazushige Seike, Tadashi Okada, Maki Sato, and Takamitsu Kohzuma. "Induced Coherent Protein Dynamics in Charge-Transfer Reaction of Plastocyanin." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2000. http://dx.doi.org/10.1364/up.2000.wb4.

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Reports on the topic "Ultrafast charge dynamics"

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Hupp, J. T. Dynamic structural effects and ultrafast biomolecular kinetics in photoinduced charge transfer reactions. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5714156.

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Klopf, John. Ultrafast Carrier Dynamics Measured by the Transient Change in the Reflectance of InP and GaAs Film. Office of Scientific and Technical Information (OSTI), October 2005. http://dx.doi.org/10.2172/920104.

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Hupp, J. T. Dynamic structural effects and ultrafast biomolecular kinetics in photoinduced charge transfer reactions. Progress report, September 15, 1990--March 14, 1992. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/10121185.

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Hupp, J. T. Dynamic structural effects and ultrafast biomolecular kinetics in photoinduced charge transfer reactions. Three year progress report, March 15, 1991--May 14, 1994. Office of Scientific and Technical Information (OSTI), April 1994. http://dx.doi.org/10.2172/10144260.

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