Microstructure control of organic semiconductors via UV-ozone for high-sensitivity NO2 detection  

作　　者：HOU SiHui FAN HuiDong WU MengGe YU XinGe YU JunSheng 

机构地区：[1]State Key Laboratory of Electronic Thin Films and Integrated Devices,School of Optoelectronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 610054,China [2]Department of Biomedical Engineering,City University of Hong Kong,Hong Kong,China

出　　处：《Science China(Technological Sciences)》2021年第5期1057-1064,共8页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.61421002,61675041,51703019&31771079);the National Key R&D Program of China(Grant No.2018YFB0407102);the Project of Science and Technology of Sichuan Province(Grant Nos.2020YFG0281,2019YFG0121&2020YFG0279);City University of Hong Kong(Grant No.9610423);sponsored by Sichuan Province Key Laboratory of Display Science and Technology。

摘　　要：Developing high sensitive organic semiconductors(OSCs)in organic thin-film transistors(OTFTs)is the key for OTFT based gas sensors.Herein,we report a simple processing route of highly sensitive OSCs for high performance OTFT based nitrogen dioxide(NO2)sensors,where the active OSC layer is based on ultraviolet-ozone(UVO)treated poly(3-hexylthiophene-2,5-diyl)(P3HT).Compared to conventional P3HT based OTFT sensors,the reported device exhibits a remarkable improvement of the gas response from 350%to 30000%.The studies in morphologies,chemical compositions and microstructures of the UVOtreated films reveal that a large number of carrier traps generated in the P3HT films is the decisive reason for the enhancement of sensing performance.Moreover,the optimized device shows great potential of practical applications on the stand points of sensitivity,selectivity,reusability and the ability of recovery,as well as limit of detection of~7.3 ppb.This simple method provides an innovative understanding for the role of the carrier traps in sensing performance and demonstrates a bright future for developing high performance OTFT gas sensors.

关 键 词：ultraviolet-ozone organic thin-film transistors gas sensors carrier traps nitrogen dioxide 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TN321.5[电子电信—物理电子学] TP212[自动化与计算机技术—检测技术与自动化装置]