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Photoresponsive Transistors Based on Lead‐Free Perovskite and Carbon Nanotubes
Author(s) -
Liu Zhen,
Dai Shilei,
Wang Yan,
Yang Ben,
Hao Dandan,
Liu Dapeng,
Zhao Yiwei,
Fang Lu,
Ou Qingqing,
Jin Shu,
Zhao Jianwen,
Huang Jia
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201906335
Subject(s) - materials science , photodetection , perovskite (structure) , optoelectronics , photodetector , photoelectric effect , carbon nanotube , transistor , nanotechnology , chemical engineering , electrical engineering , voltage , engineering
Lead‐free perovskite materials are exhibiting bright application prospects in photodetectors (PDs) owing to their low toxicity compared with traditional lead perovskites. Unfortunately, their photoelectric performance is constrained by the relatively low charge conductivity and poor stability. In this work, photoresponsive transistors based on stable lead‐free bismuth perovskites CsBi 3 I 10 and single‐walled carbon nanotubes (SWCNTs) are first reported. The SWCNTs significantly strengthen the dissociation and transportation of the photogenerated charge carriers, which lead to dramatically improved photoresponsivity, while a decent I light / I dark ratio over 10 2 can be maintained with gate modulation. The devices exhibit high photoresponsivity (6.0 × 10 4 A W −1 ), photodetectivity (2.46 × 10 14 jones), and external quantum efficiency (1.66 × 10 5 %), which are among the best reported results in lead‐free perovskite PDs. Furthermore, the excellent stability over many other lead‐free perovskite PDs is demonstrated over 500 h of testing. More interestingly, the device also shows the application potential as a light‐stimulated synapse and its synaptic behaviors are demonstrated. In summary, the lead‐free bismuth perovskite‐based hybrid phototransistors with multifunctional performance of photodetection and light‐stimulated synapse are first demonstrated in this work.