Simultaneous and distinguishable detection of external stimuli such as light and temperature is of great interest for a variety of scientific and industrial applications.Theoretically,an organic semiconductor with low exciton binding energy,low thermal activation energy and good charge transporting property produces thermally enhanced photo-electric response in organic phototransistors (OPTs),which thus provides an ideal and effective way to realize the simultaneous and distinguishable detection of temperature and light.However,there is no report on such a kind of organic semiconductor until now.Herein,we designed and synthesized a narrow band gap organic small molecule semiconductor 2,5-bis(2-butyloctyl)-3,6-bis(5-(4-(diphenylamino)phe-nyl)thiophen-2-yl)-2,5-dihydropyrrolo[3,4-c]pyrrole-1,4-dione (DPP-T-TPA) with low exciton binding energy (about 37 meV)and small activation energy (about 61 meV) for distinct thermal-dependence of charge carrier and exciton.The low exciton binding energy enables the semiconductor to exhibit strong thermal dependence of exciton dissociation,which contributes to the thermally-enhanced photo-electric response.Furthermore,the low thermal activation energy produces the weak thermal de-pendence of charge transport,which avoids the disturbance of thermally-modulated charge transport on photo-electric response.Benefiting from these two features,phototransistors based on DPP-T-TPA show great potential in simultaneous and distin-guishable detection of light and temperature,which represents a novel and efficient way for bifunctional detection.

Yongxu Hu;Li Yu;Yinan Huang;Zhongwu Wang;Shuguang Wang;Xiaosong Chen;Deyang Ji;Huanli Dong;Jie Li;Yajing Sun;Liqiang Li;Wenping Hu

Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,Institute of Molecular Aggregation Science,Tianjin University,Tianjin 300072,China;Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Fuzhou 350207,China

中国科学:化学（英文版）

[1]Yongxu Hu;Li Yu;Yinan Huang;Zhongwu Wang;Shuguang Wang;Xiaosong Chen;Deyang Ji;Huanli Dong;Jie Li;Yajing Sun;Liqiang Li;Wenping Hu-.Thermally-enhanced photo-electric response of an organic semiconductor with low exciton binding energy for simultaneous and distinguishable detection of light and temperature)[J].中国科学:化学（英文版）,2022(01):145-152

OPTs,butyloctyl,diphenylamino,thiophen,dihydropyrrolo,guishable

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