支化(高分子化学)
材料科学
聚合物
侧链
化学物理
薄膜
板层(表面解剖学)
微晶
共轭体系
链条(单位)
形态学(生物学)
纹理(宇宙学)
薄膜晶体管
纳米技术
复合材料
化学
物理
计算机科学
冶金
生物
人工智能
遗传学
天文
图层(电子)
图像(数学)
作者
Xuncheng Liu,Bo He,Andrés Garzón-Ruíz,Amparo Navarro,Teresa L. Chen,Matthew A. Kolaczkowski,Shizhen Feng,Lianjie Zhang,Christopher L. Anderson,Junwu Chen,Yi Liu
标识
DOI:10.1002/adfm.201801874
摘要
Abstract Three series of low‐bandgap polymers based on a novel quinoidal para ‐azaquinodimethane ( p ‐AQM) unit are devised and synthesized, enabling an in‐depth study of the impact of structural factors such as polymer main chain, branching point of the side chain, and the length of the branch chains on the thin film morphologies and charge transport properties. Morphological studies reveal that the polymers composed of larger repeating units exhibit a stronger tendency to form edge‐on lamella. On the other hand, altering the side chain structures of polymers with the same main chain configuration indicates that the branching point position has a more deterministic impact than the branch chain length on the interchain interactions and the crystallite orientation. These results demonstrate a compound odd‐even effect of the branching point on the chain packing and morphology, which correlates well with the corresponding field effect transistor performances. The polymer with the branching point at the fourth carbon displays the highest charge carrier mobility over 1.0 cm 2 V −1 s −1 , concurrent with a bimodal texture. This study provides a comprehensive description of the correlations between polymer structures, thin film morphology, and device performances, providing a clear path to desirable bimodal thin film texture for charge transport.
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