基于CsPbBr_(3)量子点/有机半导体/SnO_(2)异质结的自供电型探测器用于弱光检测

Self-powered photodetectors based on CsPbBr_(3)quantum dots/organic semiconductors/SnO_(2)heterojunction for weak light detection

全无机卤化铅钙钛矿量子点由于其优异的光电性能在光电探测器的发展中展示出巨大的潜力.然而,基于纯钙钛矿量子点的光电探测器光响应性能通常受到钙钛矿量子点薄膜电荷传输效率差的限制.本工作报道了基于钙钛矿量子点和有机半导体PQT-12(聚3,3′′′-二十二烷基四噻吩)的高性能自供电光电探测器.即使在自供电模式下,该器件仍然可以对光信号展示出稳定的光响应性质,并实现了优异的光探测性能,包括5.8×10^(12)Jones的探测率和高达105的光暗电流比.更重要的是,器件对于强度低至3 nW cm^(-2)的弱光具有明显的光响应.据我们所知,该器件的自供电弱光探测能力优于大多数报道的基于钙钛矿量子点的光电探测器.此外,器件还可以制备成柔性探测器,在不同的弯曲角度下器件的光电流几乎保持不变.相比于已报道的自供电光电探测器,我们的器件综合性能十分优异.本工作可以为基于钙钛矿量子点开发高性能弱光探测自供电光电探测器提供借鉴.

All-inorganic lead halide perovskite quantum dots(QDs)show great potential in the development of photodetectors(PDs)due to their excellent photoelectric properties.However,the photoresponse performance of the pure perovskite QDs-based PDs is usually limited by the poor charge transport efficiency of the perovskite QDs films.Here,high-performance self-powered PDs based on perovskite QDs and organic semiconductor PQT-12(poly(3,3′′′-didodecyl quarterthiophene))are reported.Even in a self-powered mode,the devices can still show stable photoresponse to light signals and achieve excellent photodetection performance,including a detectivity up to 5.8×10^(12)Jones,and I_(light)/I_(dark)ratio up to 10^(5).More importantly,the devices exhibit obvious photoresponse to weak light with intensity as low as 3 nW cm^(-2).To the best of our knowledge,the weak light detection ability of the device is better than most reported PDs based on perovskite QDs.In addition,the devices can be fabricated into flexible PDs with almost unchanged photocurrent under different bending angles.The overall performances of our devices are excellent among the reported self-powered PDs.This method utilized here provides new guides for developing high-performance self-powered PDs based on perovskite QDs for weak light detection.