Academic literature on the topic 'Ladungsträgerdynamik'
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Dissertations / Theses on the topic "Ladungsträgerdynamik":
Mauser, Christian. "Ladungsträgerdynamik und Coulombeffekte in Halbleiter-Tetrapods." Diss., lmu, 2011. http://nbn-resolving.de/urn:nbn:de:bvb:19-126822.
Kulikovsky, Lazar. "Experimentelle Untersuchung der Ladungsträgerdynamik in photorefraktiven Polymeren." Phd thesis, Universität Potsdam, 2003. http://opus.kobv.de/ubp/volltexte/2005/130/.
The ongoing development of information processing requires new materials that are capable of effective light modulation, processing or storage. Photorefractive (PR) materials characterized by a reversible light-induced change of the refractive index have been effectively used for different optical applications. When a photorefractive medium is inhomogeneously irradiated, using for example an interference pattern, the generation, transport and trapping of the charge carriers results in the formation of a space charge field. The spatial modulation of the space charge field is transformed through the electro-optical effect into a modulation of the refractive index.
While photorefractive crystals are well known since the discovery of the PR effect in 1966, the photorefractive effect in polymers has only recently been demonstrated. The flexibility of material composition and thus its parameters along with easy processability of polymer materials essentially extends the range of possible applications of photorefractive materials. The response time of PR polymers is defined by the charge carrier dynamics including generation, transport, trapping etc. But a relation between the charge carriers dynamics and the response time of PR effect has not yet been proven experimentally. In this work a method for the experimental determination of all photo-physical parameters defining the formation of the space charge field in organic photorefractive materials has been proposed for the first time. It is based on the analysis of the photocurrent measured under different irradiation conditions such as continuous and pulse irradiation with different intensities, the variation of the pulse length, the number of pulses or the delay between pulses. Thus, the irradiation with single short pulses allowed to determine the mobility of free charge carriers as well as the characteristic parameters of shallow traps. In order to determine the density of deep traps, the intensity dependence of the steady-state photocurrent was investigated. The determining system of equations was analytically solved and it has been shown that the sublinear dependence of the photocurrent on intensity is primary correlated with the ratio of detrapping and trapping coefficients for deep traps. The detrapping coefficient of deep traps was independently determined from double-pulse experiments in which the delay between two pulses was varied. The dynamics of the space charge field formation has been numerically simulated, using the obtained photophysical parameters, and proven to coincide well with the experimentally determined dynamics of the PR effect. This allowed to relate the parameters of the individual processes participating in the formation of the space charge field to the dynamics of the PR effect in the investigated polymers. These results show that neither photogeneration nor transport of the charge carriers do limit the formation of the space charge field. It is demonstrated that in the investigated PR materials the dynamics of the space charge field is limited by the filling of deep traps with the photogenerated charge carriers.
Plötzing, Tobias Verfasser], Joachim [Akademischer Betreuer] [Knoch, and Andrei [Akademischer Betreuer] Vescan. "Ladungsträgerdynamik in Graphen / Tobias Plötzing ; Joachim Knoch, Andrei Vescan." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1171323719/34.
Plötzing, Tobias [Verfasser], Joachim [Akademischer Betreuer] Knoch, and Andrei [Akademischer Betreuer] Vescan. "Ladungsträgerdynamik in Graphen / Tobias Plötzing ; Joachim Knoch, Andrei Vescan." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/1171323719/34.
Budweg, Arne [Verfasser]. "Ultraschnelle Ladungsträgerdynamik in elektronischen Systemen mit eingeschränkter Geometrie / Arne Budweg." Konstanz : KOPS Universität Konstanz, 2019. http://d-nb.info/1198680008/34.
Lonnemann, Jan Gerrit [Verfasser]. "Einfluss der Ladungsträgerdynamik auf die Spinrelaxation in GaAs / Jan Gerrit Lonnemann." Hannover : Technische Informationsbibliothek (TIB), 2017. http://d-nb.info/1150537124/34.
Stich, Dominik [Verfasser], and Tobias [Akademischer Betreuer] Hertel. "Zur Exziton- und Ladungsträgerdynamik in einwandigen Kohlenstoffnanoröhren / Dominik Stich. Betreuer: Tobias Hertel." Würzburg : Universitätsbibliothek der Universität Würzburg, 2012. http://d-nb.info/1022061194/34.
Köster, Niko [Verfasser], and Sangam [Akademischer Betreuer] Chatterjee. "Kohärente optische Prozesse und inkohärente Ladungsträgerdynamik in Germanium / Niko Köster. Betreuer: Sangam Chatterjee." Marburg : Philipps-Universität Marburg, 2012. http://d-nb.info/1027183875/34.
Reimann, Johannes [Verfasser], and Ulrich [Akademischer Betreuer] Höfer. "Ladungsträgerdynamik und Photoströme im Dirac-Kegel topologischer Isolatoren / Johannes Reimann ; Betreuer: Ulrich Höfer." Marburg : Philipps-Universität Marburg, 2019. http://d-nb.info/118744359X/34.
Kinzel, Jörg Benjamin Verfasser], and Achim [Akademischer Betreuer] [Wixforth. "Akusto-elektrisch getriebene Modulation der Ladungsträgerdynamik in GaAs-Nanodrähten / Jörg Benjamin Kinzel. Betreuer: Achim Wixforth." Augsburg : Universität Augsburg, 2015. http://d-nb.info/1080479260/34.