期刊
APPLIED PHYSICS LETTERS
卷 99, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3651752
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资金
- Dutch Polymer Institute (DPI) [678]
In organic bulk heterojunction solar cells, a deviation of the ideality factor of the dark current from unity is commonly put forward as evidence for the presence of trap-assisted recombination. We demonstrate that the non-ideality of the dark characteristics is determined by deeply trapped carriers in the transport-dominating constituent of the donor:acceptor blend, rather than a trap-assisted recombination mechanism. The light-intensity dependence of the open-circuit voltage confirms the absence of trap-assisted recombination and demonstrates that the dominant recombination mechanism in the investigated polymer:fullerene solar cells is bimolecular. (C) 2011 American Institute of Physics. [doi:10.1063/1.3651752]
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