期刊
ACS NANO
卷 5, 期 1, 页码 376-384出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn1017632
关键词
block copoly(3-alkylthiophene) nanowire; nanowire aspect ratio; polymer solar cell; charge transport; block copolymer semiconductor; photovoltaic properties; solution-phase self-assembly
类别
资金
- U.S. DOE, Basic Energy Sciences, Division of Materials Science [DE-FG02-07ER46467]
- NSF [DMR-0805259, DMR-0120967]
- ONR [N00014-1-1148]
- Center for Nanotechnology
The solution-phase self-assembly of nanowires (NWs) from diblock copolymer semiconductors, poly(3-butylthiophine)-block-poly(3-octylthiophene); of different block compositions gave crystalline NWs of similar width (13-16 nm) but a tunable average aspect ratio (length/width) of 50-260. The power conversion efficiency of bulk heterojunction solar cells comprising the diblock copolythiophene NWs and PC71BM was found to Increase with increasing aspect ratio, reaching 3.4% at the highest average aspect ratio of 260. The space charge limited current mobility of holes in,neat films of the copolymer NWs and in copolymer NWs/PC71BM films (similar to 1.0 X 10(-4) cm(2)/(V s)) was invariant with aspect ratio, reflecting the parallel orientation of the NWS to the substrate. The enhancement of photovoltaic efficiency with increasing aspect ratio Of NWs was explained in terms of increased exciton And charge photogeneration and collection in the bulk heterojunction solar cells.
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