Sensory Adaptation and Neuromorphic Phototransistors Based on CsPb(Br1-xIx)3 Perovskite and MoS2 Hybrid Structure
Sensory Adaptation and Neuromorphic Phototransistors Based on CsPb(Br1-xIx)3 Perovskite and MoS2 Hybrid Structure
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DOI：
10.1021/acsnano.0c01689
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发表时间：
2020-08-25
期刊：
影响因子：
17.1
通讯作者：
Kim, Sunkook
中科院分区：
文献类型：
--
作者：
Hong, Seongin;Choi, Seung Hee;Kim, Sunkook
感觉适应是维持人类生命的生物神经系统的重要组成部分。利用 CsPb(Br1-xIx)3 钙钛矿的光诱导卤化物相分离，我们引入了模拟人类感觉适应的神经形态光电晶体管。基于钙钛矿和过渡金属二硫族化物 (TMD) 混合结构的光电晶体管模拟响应连续光刺激的感觉适应，类似于神经系统。感觉适应的基本机制是混合卤化物钙钛矿的卤化物偏析。可见光照射下的相分离导致 I 和 Br 分离成单独的富含碘化物和溴化物的区域，从而显着改变光电晶体管中的光电流。该装置在去除光刺激后是可逆的，导致相分离之前的光敏度几乎完全恢复（5 分钟休息时间灵敏度恢复 96.65%）。所提出的基于钙钛矿-TMD混合结构的光电晶体管可应用于其他神经形态器件，例如神经形态光子器件、智能传感器和选择性光检测图像传感器。
Sensory adaptation is an essential part of biological neural systems for sustaining human life. Using the light-induced halide phase segregation of CsPb(Br1-xIx)3 perovskite, we introduce neuromorphic phototransistors that emulate human sensory adaptation. The phototransistor based on a hybrid structure of perovskite and transition-metal dichalcogenide (TMD) emulates the sensory adaptation in response to a continuous light stimulus, similar to the neural system. The underlying mechanism for the sensory adaptation is the halide segregation of the mixed halide perovskites. The phase separation under visible-light illumination leads to the segregation of I and Br into separate iodide- and bromide-rich domains, significantly changing the photocurrent in the phototransistors. The devices are reversible upon the removal of the light stimulation, resulting in near-complete recovery of the photosensitivity before the phase segregation (sensitivity recovery of 96.65% for 5 min rest time). The proposed phototransistor based on the perovskite-TMD hybrid structure can be applied to other neuromorphic devices such as neuromorphic photonic devices, intelligent sensors, and selective light-detecting image sensors.