期刊
ORGANIC ELECTRONICS
卷 34, 期 -, 页码 246-253出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.04.005
关键词
Hybrid solar cell; Heterojunction; Interface engineering; Charge transport; Surface recombination
资金
- Ministry of Science and Technology and Academia Sinica in Taiwan [103-2221-E-009-166-MY3, 102-2221-E-009 -073-MY3, 104-2112-M-009-009-MY3, 104-2119-M-009 -012, AS-105-SS-A01]
The solution p-type doping of various conjugated polymers and small molecules via blending with tetrafluorotetracyano-quinodimethane (F4-TCNQ) is investigated to facilitate hole transport for hybrid organic-silicon-nanowire solar cells. Among all, the highly-fluorescent conjugated polymers such as poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) demonstrate superior transport characteristics, where both the device fill-factor and power conversion efficiency (PCE) are positively correlated with the doping concentration. The best PCE achieves 13.66% from the device with 30% p-doped PFO, compared to the reference at 12.50%. The enhancement is ascribed to the efficient interfacial charge-carrier recombination with minimal energy losses. A vertically graded doping profile is further revealed with F4-TCNQ molecules preferentially accumulated near the silicon surface. (C) 2016 Elsevier B.V. All rights reserved.
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