响应度
材料科学
光电探测器
红外线的
接受者
带隙
半导体
有机半导体
光电子学
硅
光学
凝聚态物理
物理
作者
H.W. Zhang,Rui Mao,Yuan Liu,Yang Wang,Wei Liu,Jiaqi Wang,Huiling Tai,Yadong Jiang
标识
DOI:10.1021/acsami.3c15902
摘要
The nonclassical ten-pi-electron 5,5-fused thieno[3,4-c]thiadiazole (TTD) unit is an excellent building block for constructing sub-silicon-band gap organic semiconductors. However, no small molecule acceptor (SMA) materials based on TTD have been reported despite the fact that high-sensitivity near-infrared organic photodetectors (OPDs) are generally achieved by using SMAs. In this work, we report a TTD-based narrow band gap (0.95 eV) SMA material TTD(DTC-2FIC)2 with strong near-infrared absorption. Employing PTB7-Th as a donor, OPDs based on TTD(DTC-2FIC)2 exhibit an optimized responsivity of 0.095 (±0.007) A W–1 at 1100 nm and sustain a decent responsivity of 0.074 (±0.008) A W–1 at 1200 nm. Moreover, a good specific detectivity over 1 × 1011 Jones is achieved at a wavelength of 1200 nm. Detailed characterizations imply that the performance of TTD(DTC-2FIC)2-based OPDs may be substantially improved by choosing lower-mixing donors with shallower energy levels. This work demonstrates that SMAs incorporating TTD as the core unit hold promise for constructing high-sensitivity sub-silicon-band gap OPDs.
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