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

초록

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 (lambda = 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 similar to 538 mA W-1 (lambda = 1500 nm), similar to 541 mA W-1 (lambda = 2000 nm), and similar to 222 mA W-1 (lambda = 3000 nm). The present breakthrough SWIR-OPTR technology can pave a way for further advances in SWIR-absorbing organic materials and flexible SWIR sensors.

키워드