Short-wave infrared organic phototransistors with strong infrared-absorbing polytriarylamine by electron-transfer doping  

作　　者：Chulyeon Lee Hwajeong Kim Youngkyoo Kim 

机构地区：[1]Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications(KINPA),Department of Chemical Engineering,School of Applied Chemical Engineering,Kyungpook National University,Daegu,Republic of Korea [2]Priority Research Center,Research Institute of Environmental Science&Technology,Kyungpook National University,Daegu,Republic of Korea.

出　　处：《npj Flexible Electronics》2021年第1期59-67,共9页npj-柔性电子（英文）

基　　金：supported by the National Research Foundation(NRF)of Korea(NRF_2018R1D1A3B07046214,NRF_2018R1D1A1B07051075,Basic Science Research Program_2018R1A6A1A03024962);the International Cooperative R&D program funded by the Ministry of Trade,Industry and Energy(MOTIE)and Korea Institute for Advancement of Technology(KIAT,Project No.P0011262).

摘　　要：Short-wavelength infrared(SWIR)sensors have attracted keen attention due to the increasing necessity in a variety of scientific and industrial applications,including biomedical and information technology fields.Because conventional SWIR sensors are made of inorganic materials with rigid and brittle characteristics,organic materials with a discrete SWIR absorption are required for flexible SWIR sensors in the flexible electronics era.Here,we demonstrate that a polytriarylamine,poly[N,N′-bis(4-butylphenyl)-N,N′-bis(phenyl)benzidine](PolyTPD),can absorb almost full range of SWIR wavelength(λ=1000–3200 nm)after 48 h doping with tris(pentafluorophenyl)borane(BCF).The spectroscopic characterization disclosed that an electron transfer from PolyTPD to BCF created a new low energy level(gap)state leading to the SWIR absorption in the BCF-doped PolyTPD complexes.Organic phototransistors(OPTRs)with the BCF-doped PolyTPD films as a gate-sensing layer could detect the SWIR light with a reasonable photoresponsivity of~538 mAW^(−1)(λ=1500 nm),~541 mAW^(−1)(λ=2000 nm),and~222 mAW^(−1)(λ=3000 nm).The present breakthrough SWIR-OPTR technology can pave a way for further advances in SWIR-absorbing organic materials and flexible SWIR sensors.

关 键 词：DOPING absorbing TRANSFER 

分 类 号：O62[理学—有机化学]