An asymmetric A-D-π-A type non-fullerene acceptor enables high-detectivity near-infrared organic photodiodes  

作　　者：Ziping Zhong Xin Liu Ling Li Zeyao Han Yin He Xiaobao Xu Jiefeng Hai Rihong Zhu Jiangsheng Yu 

机构地区：[1]School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China [2]College of Chemistry and Bioengineering,Guilin University of Technology,Guilin 541004,China [3]School of Material Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Science China Chemistry》2023年第1期242-250,共9页中国科学（化学英文版）

基　　金：supported by the National Natural Science Foundation of China(21905137);the Basic Ability Improvement Project for Young and Middle-aged University Teachers of Guangxi(2022KY0256)。

摘　　要：Narrow bandgap non-fullerene acceptors(NFAs)are relevant as key materials components for the fabrication of near-infrared(NIR)organic solar cells(OSCs)and organic photodiodes(OPDs)thanks to their complementary absorption,tunable energy levels,and enhanced stability.However,high-performance NIR photodetectors are still scarce due to the absence of narrow bandgap NFAs.Herein,an asymmetric A-D-π-A type NFA,named ABTPV-S,with a broad optical absorption approaching 1,000 nm is designed and synthesized through integrating alkylthio side chains and a vinyleneπ-bridge.The optimal inverted OPD device exhibits an excellent performance with a photoresponsivity of 0.39 AW-1,a noise current of 2.25×10^(-14)A Hz^(-0.5),a specific detectivity(D*)of 3.43×10^(12)Jones at 840 nm,and linear dynamic range(LDR)of 140 d B.In addition,the rise and fall times for ABTPV-S-based OPDs also reach 1.07 and 0.71μs,respectively.ABTPV-S-based OPDs exhibit a high D*over 1012Jones at 950 nm,which is a competitive result for the self-powered photodiode-type NIR OPDs.These findings highlight the outstanding potential of asymmetric A-D-π-A type NIR NFAs for high-performance OPDs competing with their silicon counterparts.

关 键 词：asymmetric non-fullerene acceptor high-detectivity NEAR-INFRARED organic solar cells organic photodiodes 

分 类 号：TB34[一般工业技术—材料科学与工程]