电子迁移率
材料科学
聚合物
二亚胺
电子
电子受体
化学物理
共聚物
电子传输链
高分子化学
化学
光化学
分子
光电子学
物理
有机化学
复合材料
苝
量子力学
生物化学
作者
Duyen K. Tran,Amélie Robitaille,I Jo Hai,Chiu‐Chu Lin,Daiki Kuzuhara,Tomoyuki Koganezawa,Yu‐Cheng Chiu,Mario Leclerc,Samson A. Jenekhe
标识
DOI:10.1021/acs.chemmater.2c02357
摘要
Electron transport is critical to the use of n-type semiconducting polymers in diverse electronic and optoelectronic devices. Herein, we combine measurements of field-effect electron mobility and bulk electron mobility with thin-film microstructure characterization to elucidate the polymer chain length dependence of electron transport in n-type semiconducting polymers, exemplified by a naphthalene diimide-biselenophene copolymer, PNDIBS. Both bulk electron mobility measured by the space–charge limited current method and field-effect electron mobility of PNDIBS and other n-type semiconducting copolymers exhibit a peak at a critical degree of polymerization (DPc) of 45–60 repeat units. The decreased electron mobility below DPc is shown to originate from reduced intercrystallite connectivity while above DPc, intrachain twisting/folding, interchain entanglements, and intracrystallite limitations dominate electron transport. These findings provide a unified picture of the effects of polymer molecular weight on electron transport in naphthalene diimide-based polymers and offer a more quantitative design rule for high-mobility n-type polymers with donor–acceptor architecture.
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