TY - JOUR
T1 - Light-activated inorganic CsPbBr2I perovskite for room-temperature self-powered chemical sensing
AU - Chen, Hongjun
AU - Zhang, Meng
AU - Fu, Xiao
AU - Fusco, Zelio
AU - Bo, Renheng
AU - Xing, Bobo
AU - Nguyen, Hieu T.
AU - Barugkin, Chog
AU - Zheng, Jianghui
AU - Lau, Cho Fai Jonathan
AU - Huang, Shujuan
AU - Ho-Baillie, Anita W. Y.
AU - Catchpole, Kylie R.
AU - Tricoli, Antonio
PY - 2019/11/21
Y1 - 2019/11/21
N2 - Halide perovskite materials are excellent light harvesters that have generated enormous interest for photovoltaic technology and an increasing number of other optoelectronic applications. Very recently, their use for miniaturized chemical sensors has shown a promising room-temperature response. Here, we present some insights on the use of CsPbBr2I (CPBI) perovskites for self-powered room-temperature sensing of several environmentally and medically relevant compounds demonstrating rapid detection of down to concentrations of 1 ppm. Notably, the photocurrent of these self-powered CPBI-based devices increases under exposure to both reducing (e.g. acetone, propane) and oxidizing (e.g. NO2, O2) gas molecules and decreases rapidly upon reverting to an inert atmosphere. In situ photoluminescence (PL) analysis of the CPBI during exposure to oxidizing molecules reveals a strongly increased PL intensity and longer lifetime indicating a prevalent role of CPBI trap states in the sensing mechanism. These findings provide new insights for the engineering of perovskite-based materials for their future chemical sensing applications.
AB - Halide perovskite materials are excellent light harvesters that have generated enormous interest for photovoltaic technology and an increasing number of other optoelectronic applications. Very recently, their use for miniaturized chemical sensors has shown a promising room-temperature response. Here, we present some insights on the use of CsPbBr2I (CPBI) perovskites for self-powered room-temperature sensing of several environmentally and medically relevant compounds demonstrating rapid detection of down to concentrations of 1 ppm. Notably, the photocurrent of these self-powered CPBI-based devices increases under exposure to both reducing (e.g. acetone, propane) and oxidizing (e.g. NO2, O2) gas molecules and decreases rapidly upon reverting to an inert atmosphere. In situ photoluminescence (PL) analysis of the CPBI during exposure to oxidizing molecules reveals a strongly increased PL intensity and longer lifetime indicating a prevalent role of CPBI trap states in the sensing mechanism. These findings provide new insights for the engineering of perovskite-based materials for their future chemical sensing applications.
UR - http://www.scopus.com/inward/record.url?scp=85074676094&partnerID=8YFLogxK
UR - http://purl.org/au-research/grants/arc/DP150101939
UR - http://purl.org/au-research/grants/arc/DE160100569
UR - http://purl.org/au-research/grants/arc/DP160102955
U2 - 10.1039/c9cp03059j
DO - 10.1039/c9cp03059j
M3 - Article
C2 - 31658307
AN - SCOPUS:85074676094
SN - 1463-9076
VL - 21
SP - 24187
EP - 24193
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
IS - 43
ER -