期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 4, 期 12, 页码 5077-5083出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ee02181h
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资金
- FFG (Die Osterreichische Forschungsforderungsgesellschaft) [818046]
Organic semiconductor blends yielding efficient charge generation and transport are key components for the development of high performance organic bulk-heterojunction solar cells. In this paper the effect of the processing additive octane-dithiol on the charge transfer emission in poly[2,6-(4,4-bis-(2-ethylhexyl)- 4H-cyclopenta[2,1-b; 3,4-b']-dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) and [6,6]-phenyl-C-61-butyric acid methyl ester (PCBM) is investigated. Despite the fact that blends processed with and without additive show a ground state charge transfer optical absorption only the blend processed without additive shows a corresponding charge transfer emission. The presented experimental data show that the nano-morphology of the bulk-heterojunction blends plays an important role for the formation of emissive charge transfer excitons, and that it is a loss channel in the studied solar cells.
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