期刊
SOLAR RRL
卷 2, 期 10, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.201800141
关键词
electrodes buffer layer; light management; optical electric field distribution; polymer solar cells; solution processing
资金
- National Natural Science Foundation of China [51573042, 51602102]
- Opening Project of Key Laboratory of Optoelectronic Chemical Materials and Devices, Ministry of Education, Jianghan University [JDGD-201801]
- Fundamental Research Funds for the Central Universities in China [2016YQ06, 2018MS032, 2016MS50, 2017MS027, 2018ZD07, 2017XS084]
Light management is important for improving light absorption within active layers in polymer solar cells (PSCs). Electrode buffer layers play an important role in modulating the distribution of optical electric filed within the photoactive layer. Herein, the authors employ solution-processed WOx or ReOx to substitute the acidic poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as the anode buffer layer and ZrAcac or HfAcac to replace Mg as the cathode buffer layer. Optical transfer matrix formalism simulation is used to model the absorption spectra, exciton generation rate, and optical electric field distribution of devices. Simulated results shows that stronger absorption, quicker exciton generation rate, and more reasonable photoelectric field distribution can be achieved in the photoactive layer with solution-processed buffer layer modification, which results in a higher short-circuit current density (J(sc)). Under the guidance of theoretical simulation, the device with architecture of ITO/WOx/PTB7-Th:PC71BM/HfAcac/Al is optimized. Compared with the traditional PEDOT:PSS-Mg based device, the J(sc) is increased from 16.60 to 18.61mAcm(-2) and the best power conversion efficiency (PCE) is increased from 9.02% to 10.60% for the device with WOx-HfAcac modification, which is among the best values reported for fullerene-based PSCs. The good agreement between simulated and experimental results indicates that optical model is a useful tool for device design and optimization.
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