期刊
MATERIALS
卷 15, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/ma15093293
关键词
conductive polymer; chemical doping; electrical conductivity; carrier mobility
类别
资金
- National Natural Science Foundation of China [21905294]
- Shanghai Sailing Program
The choice of solvent for film preparation has a significant impact on the film morphology, doping level, and charge transport behavior, and thus affects the electrical conductivity. Crystallinity plays a key role in charge transport properties.
The utility of a solvent is one of the key factors that impacts resultant film morphology. However, the effect of solvent-dependent morphology on the doping process and electrical conductivity has not been adequately elucidated. In this work, we compared the morphology of chloroform- and chlorobenzene-processed thiophene polymer films and investigated how the choice of solvent influences film morphology, doping level, charge transport properties, and thus electrical conductivity. It was found that the film drop-casted from chloroform exhibits better crystallinity than that drop-casted from chlorobenzene. The crystallinity has negligible impact on the doping level but significant impact on charge transport properties. As a result, the chloroform-processed film shows a higher electrical conductivity of up to 408 S cm(-1) due to a high carrier mobility related to the continuously crystalline domains in film. This finding indicates that the choice of solvent for preparation of film, which strongly correlated with molecular orientation, is a new strategy to optimize the electrical conductivity of doped polymers.
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