A photoelectric synapse based on optimized perovskite CH3NH3PbBr3 quantum dot film detectors

In this work, we report a high-performance photodetector based on perovskite CH3NH3PbBr3 quantum dots (QDs) films with a configuration of Au/CH3NH3PbBr3 QDs-Al2O3-indium tin oxide/Au as a bioinspired photoelectric synapse. The uniform CH3NH3PbBr3 QDs thin film is fabricated by a electrodepositing QD...

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Bibliographic Details
Published in:Applied physics letters 2022-06, Vol.120 (26)
Main Authors: Xia, Liping, Huang, Jianning, Zhou, E, Chen, Yunkai, Wen, Weikun, Zhang, Xiaonan, Gao, Fangliang, Wu, Jiang, Zhang, Yong, Khisro, Said Nasir, Zha, Qingbing, Ma, Xuefeng, Chen, Xinman
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied physics
Biomimetics
Dark current
Indium tin oxides
Perovskites
Photoelectricity
Photometers
Plastic properties
Quantum dots
Synapses
Thin films
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Summary:In this work, we report a high-performance photodetector based on perovskite CH3NH3PbBr3 quantum dots (QDs) films with a configuration of Au/CH3NH3PbBr3 QDs-Al2O3-indium tin oxide/Au as a bioinspired photoelectric synapse. The uniform CH3NH3PbBr3 QDs thin film is fabricated by a electrodepositing QDs solution and exhibits favorable long-term stability at ambient. By inserting an Al2O3 film, the dark current of the QDs film photodetectors is significantly suppressed as a result of the blocking effect, accompanied by the enhanced ON/OFF ratio. Furthermore, the optimal photodetector is utilized as a photoelectric synapse. Through modulating the light pulse stimuli, some underlying synaptic functions, including paired-pulse facilitation, axon-multi-synapses network function, and the transformation from short-term plasticity to long-term plasticity, are flexibly emulated on a single photoelectric synapse. These remarkable results are promising for building hardware units with neuromorphic architecture to mimic the human brain functionalities.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0096692