材料科学
噻吩
位阻效应
电子迁移率
堆积
有机半导体
轨道能级差
共轭体系
半导体
有机场效应晶体管
场效应晶体管
晶体管
结晶学
光电子学
作者
Arulmozhi Velusamy,Yung-Chi Yang,Chia Chi Lin,Shakil N. Afraj,Kexing Jiang,Peng-Sheng Chen,Shuehlin Yau,Itaru Osaka,Shih-Huang Tung,Ming-Chou Chen,Cheng-Liang Liu
标识
DOI:10.1002/aelm.202100648
摘要
Two solution-processable organic semiconductors, DFPT-DTTR (1) and DFPbT-DTTR (2), composed of pentafluorophenyl (FP) end-capped 3,5-dialkyl dithienothiophene (DTTR) core with thiophene (T) or bithiophene (bT) as π-bridged spacers are developed and investigated for their optical, electrochemical, microstructural, and electrical properties. With more conjugated bithiophene units, compound 2 exhibits a red-shifted UV–vis absorption band and upshifted HOMO/downshifted LUMO energy levels. According to the density functional theory, compound 2 features a more twisted molecular structure due to the intrinsic non-coplanar blocks in the π-backbones. Compound 1-based organic field effect transistors exhibit efficient hole transport with mobility up to 0.48 cm2 V−1 s−1. This is one of the high mobility organic semiconductors exhibiting p-channel characteristics based on solution-processable small molecular FP end-capped fused/oligothiophenes. With large and interconnected crystalline morphologies, decreased π–π stacking distance, and less steric hindrance, compound 1 exhibits two orders of magnitude higher mobility than the more distorted 2, which exhibits lower hole mobility of 1.82 × 10−3 cm2 V−1 s−1.
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