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Journal articles on the topic 'Gradient Bulk-heterojunction'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

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1

Zhao, Ling, Suling Zhao, Zheng Xu, Qianqian Yang, Di Huang, and Xurong Xu. "A simple method to adjust the morphology of gradient three-dimensional PTB7-Th:PC71BM polymer solar cells." Nanoscale 7, no. 12 (2015): 5537–44. http://dx.doi.org/10.1039/c5nr00148j.

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Multiple interfaces are necessary for exciton separation in bulk heterojunction (BHJ) solar cells and continuous pathways for carrier transportation in donor : acceptor blend films, especially along the vertical direction, for efficient charge collection.
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2

Wang, Jin-Liang, Chengmei Zhong, Zheng-Ming Tang, Hongbin Wu, Yuguo Ma, Yong Cao, and Jian Pei. "Solution-Processed Bulk Heterojunction Photovoltaic Cells from Gradient π-Conjugated Thienylene Vinylene Dendrimers." Chemistry - An Asian Journal 5, no. 1 (January 4, 2010): 105–13. http://dx.doi.org/10.1002/asia.200900245.

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3

Lu, Shudi, Kong Liu, Dan Chi, Shizhong Yue, Yanpei Li, Yanlei Kou, Xuechun Lin, Zhijie Wang, Shengchun Qu, and Zhanguo Wang. "Constructing bulk heterojunction with componential gradient for enhancing the efficiency of polymer solar cells." Journal of Power Sources 300 (December 2015): 238–44. http://dx.doi.org/10.1016/j.jpowsour.2015.09.079.

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4

Palermo, Edmund F., Seth B. Darling, and Anne J. McNeil. "π-Conjugated gradient copolymers suppress phase separation and improve stability in bulk heterojunction solar cells." Journal of Materials Chemistry C 2, no. 17 (2014): 3401. http://dx.doi.org/10.1039/c3tc32512a.

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5

ZHOU, SHUAI, and JIU-XUN SUN. "MOBILITY DEPENDENT EFFICIENCIES OF ORGANIC BULK-HETEROJUNCTION SOLAR CELLS WITH RECOMBINATION VIA TAIL." International Journal of Modern Physics B 27, no. 28 (October 15, 2013): 1350167. http://dx.doi.org/10.1142/s0217979213501671.

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As a suitable recombination process, recombination via tail state in organic bulk-heterojunction solar cells (OBHJs) is capable of reproducing both dark and illuminated current–voltage curves. The characteristic parameters of OBHJs based on recombination via tail are governed by transportation and extraction efficiency, and both processes are strongly dependent on the charge carrier mobility. Using a macroscopic simulation, we calculate the mobility dependent power conversion efficiency, open-circuit voltage, short-circuit current and fill factor. The open-circuit voltage is determined by not only carrier density n(p), but also by carrier density gradient. Furthermore, open-circuit voltage is more affected by majority charge carriers and less affected by minority ones.
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6

Nam, Young Min, June Huh, and Won Ho Jo. "Effect of the vertical composition gradient of active layer on the performance of bulk-heterojunction organic photovoltaic cell." Journal of Applied Physics 110, no. 11 (December 2011): 114521. http://dx.doi.org/10.1063/1.3666061.

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7

Cheng, Hao-Wen, Anisha Mohapatra, Yi-Ming Chang, Chuang-Yi Liao, Yu-Tang Hsiao, Chung-Hao Chen, Yu-Che Lin, et al. "High-Performance Organic Solar Cells Featuring Double Bulk Heterojunction Structures with Vertical-Gradient Selenium Heterocyclic Nonfullerene Acceptor Concentrations." ACS Applied Materials & Interfaces 13, no. 23 (June 6, 2021): 27227–36. http://dx.doi.org/10.1021/acsami.1c06762.

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8

Trzciński, Konrad, Mariusz Szkoda, Maria Gazda, Jakub Karczewski, Adam Cenian, Galina M. Grigorian, and Mirosław Sawczak. "Pulsed Laser Deposition of Bismuth Vanadate Thin Films—The Effect of Oxygen Pressure on the Morphology, Composition, and Photoelectrochemical Performance." Materials 13, no. 6 (March 17, 2020): 1360. http://dx.doi.org/10.3390/ma13061360.

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Thin layers of bismuth vanadate were deposited using the pulsed laser deposition technique on commercially available FTO (fluorine-doped tin oxide) substrates. Films were sputtered from a sintered, monoclinic BiVO4 pellet, acting as the target, under various oxygen pressures (from 0.1 to 2 mbar), while the laser beam was perpendicular to the target surface and parallel to the FTO substrate. The oxygen pressure strongly affects the morphology and the composition of films observed as a Bi:V ratio gradient along the layer deposited on the substrate. Despite BiVO4, two other phases were detected using XRD (X-ray diffraction) and Raman spectroscopy—V2O5 and Bi4V2O11. The V-rich region of the samples deposited under low and intermediate oxygen pressures was covered by V2O5 longitudinal structures protruding from BiVO4 film. Higher oxygen pressure leads to the formation of Bi4V2O11@BiVO4 bulk heterojunction. The presented results suggest that the ablation of the target leads to the plasma formation, where Bi and V containing ions can be spatially separated due to the interactions with oxygen molecules. In order to study the phenomenon more thoroughly, laser-induced breakdown spectroscopy measurements were performed. Then, obtained electrodes were used as photoanodes for photoelectrochemical water splitting. The highest photocurrent was achieved for films deposited under 1 mbar O2 pressure and reached 1 mA cm−2 at about 0.8 V vs Ag/AgCl (3 M KCl). It was shown that V2O5 on the top of BiVO4 decreases its photoactivity, while the presence of a bulk Bi4V2O11@BiVO4 heterojunction is beneficial in water photooxidation.
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9

Yamamoto, Shuhei, Daisuke Kitazawa, Jun Tsukamoto, Takahiro Shibamori, Hirofumi Seki, and Yoshitsugu Nakagawa. "Composition depth profile analysis of bulk heterojunction layer by time-of-flight secondary ion mass spectrometry with gradient shaving preparation." Thin Solid Films 518, no. 8 (February 2010): 2115–18. http://dx.doi.org/10.1016/j.tsf.2009.07.121.

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10

Han, Jianhua, Xuewen Yin, Yu Zhou, Hui Nan, Youchen Gu, Meiqian Tai, Jianbao Li, and Hong Lin. "Perovskite/Poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] Bulk Heterojunction for High-Efficient Carbon-Based Large-Area Solar Cells by Gradient Engineering." ACS Applied Materials & Interfaces 10, no. 49 (November 20, 2018): 42328–34. http://dx.doi.org/10.1021/acsami.8b15399.

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11

Dixit, Shiv Kumar, Shikha Madan, Devinder Madhwal, Jitender Kumar, Inderpreet Singh, C. S. Bhatia, P. K. Bhatnagar, and P. C. Mathur. "Bulk heterojunction formation with induced concentration gradient from a bilayer structure of P3HT:CdSe/ZnS quantum dots using inter-diffusion process for developing high efficiency solar cell." Organic Electronics 13, no. 4 (April 2012): 710–14. http://dx.doi.org/10.1016/j.orgel.2012.01.014.

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12

Susarova, Diana K., Pavel A. Troshin, Yuriy L. Moskvin, Sergey D. Babenko, and Vladimir F. Razumov. "Vertical concentration gradients in bulk heterojunction solar cells induced by differential material solubility." Thin Solid Films 519, no. 12 (April 2011): 4132–35. http://dx.doi.org/10.1016/j.tsf.2010.11.054.

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13

Nho, Sungho, Gyoelim Baek, Sujung Park, Bo Ram Lee, Myung Joo Cha, Dong Chan Lim, Jung Hwa Seo, Seung-Hwan Oh, Myoung Hoon Song, and Shinuk Cho. "Highly efficient inverted bulk-heterojunction solar cells with a gradiently-doped ZnO layer." Energy & Environmental Science 9, no. 1 (2016): 240–46. http://dx.doi.org/10.1039/c5ee03045e.

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Highly efficient inverted BHJ solar cells were demonstrated using a wet-chemically prepared doped ZnO layer with a self-organized ripple nanostructure. The solar cell based on PTB7 and PC71BM with Li2CO3-doped ZnO layer yielded a maximum efficiency of 10.08%.
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14

Balgley, Renata, Martin Drees, Tatyana Bendikov, Michal Lahav, Antonio Facchetti, and Milko E. van der Boom. "Polypyridyl complexes as electron transporting materials for inverted bulk heterojunction solar cells: the metal center effect." Journal of Materials Chemistry C 4, no. 21 (2016): 4634–39. http://dx.doi.org/10.1039/c6tc00578k.

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15

Savagatrup, Suchol, Adam D. Printz, Timothy F. O’Connor, Insik Kim, and Darren J. Lipomi. "Efficient Characterization of Bulk Heterojunction Films by Mapping Gradients by Reversible Contact with Liquid Metal Top Electrodes." Chemistry of Materials 29, no. 1 (November 15, 2016): 389–98. http://dx.doi.org/10.1021/acs.chemmater.6b04192.

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16

Chen, Liang Yan, and Chao Fang. "Investigation on Stability and Optical Properties of ZnnSen(n=1~13) Nanocluster in CIGS-ZnSe Heterojunction Interface." Advanced Materials Research 953-954 (June 2014): 991–94. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.991.

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ZnSe cluster is the main form of growth mechanism in CuInGaSe based solar cells as the buffer layer and the building blocks for larger bulk ZnSe materials as well. With the generalized gradient approximation in first principle all-electron calculations, a number of configurations and structural isomers of ZnnSen(n=1~13) nanoclusters has been geometrically optimized to get the lowest energy constructions of ZnnSen(n=1~13). Second-order energy difference were applied to investigate the stability of small ZnSe nanoclusters. And the nanocage Zn12Se12cluster has been identified to be in rather stable state and can be the building block of larger ZnSe nanoclusters materials. Energy gap between lowest unoccupied molecular orbital and the highest occupied molecular orbital, Infrared Spectroscopy have also been investigated for further study on size and optical properties through testing methods.
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17

Zhang, Ying, Kuan Liu, Jiaming Huang, Xinxin Xia, Jiupeng Cao, Guangming Zhao, Patrick W. K. Fong, et al. "Graded bulk-heterojunction enables 17% binary organic solar cells via nonhalogenated open air coating." Nature Communications 12, no. 1 (August 10, 2021). http://dx.doi.org/10.1038/s41467-021-25148-8.

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AbstractGraded bulk-heterojunction (G-BHJ) with well-defined vertical phase separation has potential to surpass classical BHJ in organic solar cells (OSCs). In this work, an effective G-BHJ strategy via nonhalogenated solvent sequential deposition is demonstrated using nonfullerene acceptor (NFA) OSCs. Spin-coated G-BHJ OSCs deliver an outstanding 17.48% power conversion efficiency (PCE). Depth-profiling X-ray photoelectron spectroscopy (DP-XPS) and angle-dependent grazing incidence X-ray diffraction (GI-XRD) techniques enable the visualization of polymer/NFA composition and crystallinity gradient distributions, which benefit charge transport, and enable outstanding thick OSC PCEs (16.25% for 300 nm, 14.37% for 500 nm), which are among the highest reported. Moreover, the nonhalogenated solvent enabled G-BHJ OSC via open-air blade coating and achieved a record 16.77% PCE. The blade-coated G-BHJ has drastically different D-A crystallization kinetics, which suppresses the excessive aggregation induced unfavorable phase separation in BHJ. All these make G-BHJ a feasible and promising strategy towards highly efficient, eco- and manufacture friendly OSCs.
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18

Drees, M., R. M. Davis, D. Marciu, K. Premaratne, W. Graupner, M. Miller, and J. R. Heflin. "Nanoscale Control of the Polymer-Fullerene Interface in Photovoltaic Devices by Thermally-Controlled Interdiffusion." MRS Proceedings 708 (2001). http://dx.doi.org/10.1557/proc-708-bb10.35.

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ABSTRACTUltrafast photoinduced charge transfer from conjugated polymers to fullerenes has led to extensive studies of these systems as photovoltaic devices. The charge transfer process prevents radiative electron-hole recombination, resulting in free, mobile charges. A limiting factor is the exciton diffusion distance, which is of the order of 10 nm. If the fullerene is not within this distance of the optical excitation site, no charge separation will take place. The simplest system for such devices is a bilayer system in which a film of C60 is sublimed onto a spin-cast film of MEH-PPV, for example. We describe studies in which the polymer is heated above the glass transition temperature in an inert environment, inducing an interdiffusion of the polymer and the fullerene layers. With this process, a controlled, bulk, gradient heterojunction is created. The photoluminescence and the short circuit currents of the devices show a dramatic decrease in photoluminescence and concomitant increase in short circuit currents, demonstrating the improved interface.
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19

Tress, Wolfgang, Karl Leo, and Moritz Riede. "Effect of concentration gradients in ZnPc:C60 bulk heterojunction organic solar cells." Solar Energy Materials and Solar Cells, July 2011. http://dx.doi.org/10.1016/j.solmat.2011.06.003.

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20

Oh, Chang-Mok, Soyeong Jang, Jihoon Lee, Sung Heum Park, and In-Wook Hwang. "Versatile control of concentration gradients in non-fullerene acceptor-based bulk heterojunction films using solvent rinse treatments." Green Energy & Environment, January 2021. http://dx.doi.org/10.1016/j.gee.2021.01.009.

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