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Superior Self‐Powered Room‐Temperature Chemical Sensing with Light‐Activated Inorganic Halides Perovskites
Author(s) -
Chen Hongjun,
Zhang Meng,
Bo Renheng,
Barugkin Chog,
Zheng Jianghui,
Ma Qingshan,
Huang Shujuan,
HoBaillie Anita W. Y.,
Catchpole Kylie R.,
Tricoli Antonio
Publication year - 2018
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201702571
Subject(s) - halide , perovskite (structure) , materials science , oxidizing agent , passivation , optoelectronics , nanotechnology , layer (electronics) , chemical engineering , photochemistry , inorganic chemistry , chemistry , organic chemistry , engineering
Abstract Hybrid halide perovskite is one of the promising light absorber and is intensively investigated for many optoelectronic applications. Here, the first prototype of a self‐powered inorganic halides perovskite for chemical gas sensing at room temperature under visible‐light irradiation is presented. These devices consist of porous network of CsPbBr 3 (CPB) and can generate an open‐circuit voltage of 0.87 V under visible‐light irradiation, which can be used to detect various concentrations of O 2 and parts per million concentrations of medically relevant volatile organic compounds such as acetone and ethanol with very quick response and recovery time. It is observed that O 2 gas can passivate the surface trap sites in CPB and the ambipolar charge transport in the perovskite layer results in a distinct sensing mechanism compared with established semiconductors with symmetric electrical response to both oxidizing and reducing gases. The platform of CPB‐based gas sensor provides new insights for the emerging area of wearable sensors for personalized and preventive medicine.