TY - JOUR
T1 - Effects of cesium content on the triple-cation lead halide perovskite photodetectors with enhanced detectivity and response time
AU - Hsiao, Yuan Wen
AU - Song, Jyun You
AU - Wu, Hsuan Ta
AU - Hong, Kung Tung
AU - Leu, Ching Chich
AU - Shih, Chuan Feng
N1 - Funding Information:
The authors are grateful for the support of the Ministry of Science and Technology of the Republic of China under Contract No. 109-2221-E-006-137 , Taiwan. The authors gratefully acknowledge of HR-SEM (HAITACHI SU8000) belonging to the Core Facility Center of National Cheng Kung University, Taiwan. This work was financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education ( MOE ) and the Ministry of Science and Technology (MOST 110-2634-F-006-017 ) in Taiwan.
Funding Information:
The authors are grateful for the support of the Ministry of Science and Technology of the Republic of China under Contract No. 109-2221-E-006-137, Taiwan. The authors gratefully acknowledge of HR-SEM (HAITACHI SU8000) belonging to the Core Facility Center of National Cheng Kung University, Taiwan. This work was financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and the Ministry of Science and Technology (MOST 110-2634-F-006-017) in Taiwan.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2022/1/5
Y1 - 2022/1/5
N2 - This research reports on the effects of Cs doping in the Csx(FA0.75MA0.25PbI3)1−x based perovskites and photodetectors (PDs) with various Cs contents from 0% to 7.5%. The incorporation of 2.5–5% Cs markedly improved the crystal quality of perovskite films that in turns increased, the photoluminescence, absorbance, and quantum efficiency. Over-doping Cs upto 7.5% degraded the devices. X-ray photoemission spectroscopy shows that the binding energies of the Cs, Pb and I core levels shifted to high-energy side, indicating the Cs enter the lattice sites and improved the stability of the film. For PD applications, the influence of Cs doping in the perovskite was mostly on the reduction of rise time, causing by increase of the generation rate of carriers and reduction of trap densities of carriers. The 5% Cs-doped sample showed the best performance, because of the optimization of the grain size, crystal quality and trap density. As a result, the self-powered perovskite demonstrated an impressive performance with ~70% external quantum efficiency, 0.36 A W−1 responsivity, 1.15 × 1012 Jones, and rapid rise and decay time of 1.5 μs and 21 μs, respectively.
AB - This research reports on the effects of Cs doping in the Csx(FA0.75MA0.25PbI3)1−x based perovskites and photodetectors (PDs) with various Cs contents from 0% to 7.5%. The incorporation of 2.5–5% Cs markedly improved the crystal quality of perovskite films that in turns increased, the photoluminescence, absorbance, and quantum efficiency. Over-doping Cs upto 7.5% degraded the devices. X-ray photoemission spectroscopy shows that the binding energies of the Cs, Pb and I core levels shifted to high-energy side, indicating the Cs enter the lattice sites and improved the stability of the film. For PD applications, the influence of Cs doping in the perovskite was mostly on the reduction of rise time, causing by increase of the generation rate of carriers and reduction of trap densities of carriers. The 5% Cs-doped sample showed the best performance, because of the optimization of the grain size, crystal quality and trap density. As a result, the self-powered perovskite demonstrated an impressive performance with ~70% external quantum efficiency, 0.36 A W−1 responsivity, 1.15 × 1012 Jones, and rapid rise and decay time of 1.5 μs and 21 μs, respectively.
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U2 - 10.1016/j.jallcom.2021.161621
DO - 10.1016/j.jallcom.2021.161621
M3 - Article
AN - SCOPUS:85114104771
SN - 0925-8388
VL - 889
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
M1 - 161621
ER -