期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 24, 页码 13137-13141出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b03073
关键词
pi-conjugated small molecules; organic photovoltaics; transport dynamics; charge mobility; time-of-flight; organic field-effect transistor
资金
- National Natural Science Foundation of China (NSFC) [51473036]
- NSFC [51373123, 21302142]
Efficient charge transport is a key step toward high efficiency in small-Molecule organic photovoltaics. Here we applied time-of-flight and organic field-effect transistor to complementarily study the influences of molecular structure, trap states, and molecular orientation on charge transport of small-molecule DRCN7T (D1) and its analogue DERHD7T (D2). It is revealed that, despite the subtle difference of the chemical structures, D1 exhibits higher charge mobility, the absence of shallow traps, and better photosensitivity than D2. Moreover, charge transport is favored in the out-of-plane structure within D1-based organic solar cells, while D2 prefers in-plane charge transport.
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