期刊
ORGANIC ELECTRONICS
卷 31, 期 -, 页码 266-272出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.01.040
关键词
Transient photocurrent; Oxide/organic hetero-interface; Charge collection efficiency; Interfacial exciton dissociation; Absorption enhancement
资金
- Research Grants Council of Hong Kong Special Administrative Region, China [T23-713/11, GRF12303114]
- National Natural Science Foundation of China [61275037]
- Shenzhen Peacock Project [KQTD20140630110339343]
- Hong Kong Baptist University [FRG2/14-15/081]
A comprehensive study of the effect of oxide interlayer on the performance of bulk-heterojunction organic solar cells (OSCs), based on poly[[4,8-bis[(2-ethylhexyl)oxy] benzo [1,2-b:4,5-b'] dithiophene-2,6- diyl] [3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno [3,4-b] thiophenediyl]] (PTB7):[6,6]-phenyl C71 butyric acid methyl ester (PC70BM) blend system, is carried out by optical simulation, interfacial exciton dissociation and charge collection analyses. It is found that a PTB7: PC70BM blend layer thickness optimized for maximum light absorption in OSCs does not generally give rise to the highest power conversion efficiency (PCE). OSCs, e.g., based on PTB7: PC70BM blend system, can benefit from the oxide interlayer in two ways, (1) to enhance the built-in potential for reducing recombination loss of the photo-generated charges, and (2) to improve charge collection by removal of unfavorable interfacial exciton dissociation. The combined effects result in similar to 20% improvement in PCE over an optimized control cell, having an identical layer configuration without an oxide interlayer. (C) 2016 Elsevier B.V. All rights reserved.
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