期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 3, 页码 956-960出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201408882
关键词
crystal growth; heterojunctions; organic field-effect transistors; organic photovoltaics; semiconductors
资金
- 973 Program [2014CB643503]
- National Natural Science Foundation of China [51222302, 51373150, 51461165301, 91233114]
- Zhejiang Province Natural Science Foundation [LZ13E030002]
- Fundamental Research Funds for the Central Universities
- Center for Functional Nanomaterials, Brookhaven National Laboratory
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
Organic single crystals are ideal candidates for high-performance photovoltaics due to their high charge mobility and long exciton diffusion length; however, they have not been largely considered for photovoltaics due to the practical difficulty in making a heterojunction between donor and acceptor single crystals. Here, we demonstrate that extended single-crystalline heterojunctions with a consistent donor-top and acceptor-bottom structure throughout the substrate can be simply obtained from a mixed solution of C-60 (acceptor) and 3,6-bis(5-(4-n-butylphenyl)thiophene-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c] pyrrole-1,4-dione (donor). 46 photovoltaic devices were studied with the power conversion efficiency of (0.255 +/- 0.095)% under 1 sun, which is significantly higher than the previously reported value for a vapor-grown organic single-crystalline donor-acceptor heterojunction (0.007%). As such, this work opens a practical avenue for the study of organic photovoltaics based on single crystals.
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