材料科学
掺杂剂
场效应晶体管
电子迁移率
兴奋剂
并五苯
有机场效应晶体管
纳米技术
晶体管
结晶度
半导体
有机半导体
化学物理
光电子学
薄膜晶体管
化学
电气工程
电压
复合材料
工程类
图层(电子)
作者
Zongrui Wang,Ye Zou,Wangqiao Chen,Yinjuan Huang,Chang‐Jiang Yao,Qichun Zhang
标识
DOI:10.1002/aelm.201800547
摘要
Abstract Molecular doping is an effective method to enhance the charge carrier density for reducing the contact resistance and improving the charge mobility in organic field‐effect transistors (OFETs). Previous reports mainly focus on the strong dopants with the EA dopant > IE OSC (p‐type) or IE dopant < EA OSC (n‐type) to enable the efficient charge transfer (EA: electron affinity; IE: ionization energy; OSC: organic semiconductor). However, the effects of weak dopants on the OFET performance of OSC are rarely investigated. Thus, in this study, it is demonstrated that two new fluorinated compounds (Tetrafluorophthalonitrile (TFP) and Octafluoronaphthalene (OFN)) can act as weak dopants in thin film of TIPS‐Pentacene (TIPS). Although they exhibit unmatched EAs (3.45 eV for TFP and 3.44 eV for OFN) compared to the IE (5.17 eV) of the host TIPS, they still can fulfill the p‐type doping with the OSC matrix. Systematic structural and electrical characterization reveals the important role of the formed charge‐transfer interaction and the improved crystallinity in enhancing the carrier mobility. The doped poly(3‐hexylthiophene) is also investigated to confirm the universality of the weak dopants. The study should provide a new thought for the exploitation of novel planar soluble weak dopants in OFETs.
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