光探测
材料科学
光电子学
带隙
光电探测器
红外线的
半导体
有机半导体
吸收(声学)
接受者
光学
物理
凝聚态物理
复合材料
作者
Yeye Wang,Mingqun Yang,Bingyan Yin,Baoqi Wu,Guoqiang Liu,Seonghun Jeong,Yue Zhang,Changduk Yang,Zhicai He,Fei Huang,Yong Cao,Chunhui Duan
标识
DOI:10.1021/acsami.3c15365
摘要
Near-infrared organic photodetectors possess great application potential in night vision, optical communication, and image sensing, but their development is limited by the lack of narrow bandgap organic semiconductors. A–D–A′–D–A-type molecules, featuring multiple intramolecular charge transfer effects, offer a robust framework for achieving near-infrared light absorption. Herein, we report a novel A–D–A′–D–A-type narrow bandgap electron acceptor named DPPSe-4Cl, which incorporates a selenophene-flanked diketopyrrolopyrrole (Se-DPP) unit as its central A′ component. This molecule demonstrates exceptional near-infrared absorption properties with an absorption onset reaching 1120 nm and a low optical bandgap of 1.11 eV, owing to the strong electron-withdrawing ability and quinoidal resonance effect induced by the Se-DPP unit. By implementing a doping compensation strategy assisted by Y6 to reduce the trap density in the photoactive layer, the optimized organic photodetector based on DPPSe-4Cl exhibited efficient spectral response and remarkable sensitivity in the range of 300–1100 nm. Particularly, a specific detectivity surpassing 1012 Jones in the wavelength range of 410–1030 nm is achieved. This work offers a promising approach for developing highly sensitive visible to near-infrared broadband photodetection technology using organic semiconductors.
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