Approaching Ohmic hole contact via a synergetic effect of a thin insulating layer and strong electron acceptors  

基于薄绝缘层和强电子受体的协同效应实现近似欧姆接触的高效空穴注入策略

作　　者：Ziyang Liu Pengcheng Wei Zhengyang Bin Xuewen Wang Dongdong Zhang Lian Duan 刘子扬;魏鹏程;宾正杨;王学文;张东东;段炼(Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education,Department of Chemistry,Tsinghua University,Beijing 100084,China;Center for Flexible Electronics Technology,Tsinghua University,Beijing 100084,China;College of Chemistry,Sichuan University,Chengdu 610064,China;Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,China)

机构地区：[1]Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education,Department of Chemistry,Tsinghua University,Beijing 100084,China [2]Center for Flexible Electronics Technology,Tsinghua University,Beijing 100084,China [3]College of Chemistry,Sichuan University,Chengdu 610064,China [4]Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory,Xianhu Hydrogen Valley,Foshan 528200,China

出　　处：《Science China Materials》2021年第12期3124-3130,共7页中国科学（材料科学（英文版）

基　　金：supported by the National Key Basic Research and Development Program of China (2017YFA0204501 and 2020YFA0715000);the National Natural Science Foundation of China (51903137 and 61890942);Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory (XHT2020-005);financial support from the Young Elite Scientist Sponsorship Program (2019QNRC001) by China Association for Science and Technology。

摘　　要：Organic light-emitting diodes(OLEDs)have drawn tremendous attention due to their widespread applications in flat-panel displays and solid-state lightings over the years[1-4].The charge injection is crucial for the performance of OLEDs featuring sandwiched p-i-n structures[5-9].For OLEDs,an indium tin oxide(ITO)electrode with a work function of 4.7 eV,and most holetransporting materials(HTMs)with the highest occupied molecular orbitals(HOMOs)close to-5.5 eV.有效的电荷注入是发展低电压、高效率有机发光二极管(OLEDs)的关键.然而,目前应用最广泛的空穴注入材料(HATCN)的注入效率仅约10%,无法满足高清显示和照明的需要.因此,我们基于薄绝缘层(特氟龙(Teflon))和强电子受体(HATCN)的协同效应设计了一种高效、通用的空穴注入技术.研究表明特氟龙诱导形成的纳米岛状结构有助于增强界面电场局域化,搭配HATCN可以实现高效的电荷产生和空穴注入.新型的注入层(Teflon/HATCN)可实现近似欧姆接触的高效空穴注入,其注入效率高达80%以上.基于该方法制备的红色磷光OLED的启亮电压仅为2.4 V,最大外量子效率高达33.1%.本文关于薄绝缘层和强电子受体的协同效应的研究为发展高性能电荷注入材料提供了新策略.

关 键 词：空穴注入 欧姆接触 注入效率 电荷注入 外量子效率 高清显示 绝缘层 电子受体 

分 类 号：TN383.1[电子电信—物理电子学] TB34[一般工业技术—材料科学与工程]