Enhanced Performances of Photodetectors by Reducing Light Reflection Based on Two-Dimensional CsPbBr3 Composite Structures
Source abstract
Abstract
Two-dimensional (2D) perovskites have been widely applied in photoelectric devices due to their excellent optical and electrical properties. However, the low optical absorption of their ultrathin thickness inhibits photoelectron generation and thus limits their performances. Herein, we constructed 2D CsPbBr 3 devices of composite structures by combining them with g-C 3 N 4 (CN) and graphene oxide (GO). As compared to CsPbBr 3 devices, the photocurrents of GO/CsPbBr 3 and CN/CsPbBr 3 devices increase by 68 and 114%, respectively. Based on experimental spectra in combination with the finite-element method (FEM), the reflectivity values of GO/CsPbBr 3 and CN/CsPbBr 3 devices are, respectively, reduced by 21 and 33%, and therefore absorption coefficients are increased by 18 and 28%, respectively, and the corresponding internal quantum efficiencies are increased by 63 and 96%, respectively, in comparison to the CsPbBr 3 devices. Furthermore, we have quantitatively determined the linear relationship between the absorption coefficient and the photocurrent based on the diffusion theory of semiconductors. A general approach for improving the optoelectronic performance can be extended to other devices by constructing composite structures with strong photon absorption and low reflection.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Perovskite Materials and Applications · 2D Materials and Applications · Ga2O3 and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical Engineering and Mechanics, Engineering Research Center of Complex Tracks Processing Technology and Equipment of MoE, Xiangtan University, Xiangtan 411105, China
Key Laboratory of Welding Robot and Application Technology of Hunan Province, Xiangtan University, Xiangtan 411105, China
Department of Applied Physics, Hong Kong Polytechnic University, Hung Hom, Kowloon 999077, Hong Kong, P. R. China
Funding
Natural Science Foundation of Hunan Province · China Postdoctoral Science Foundation · Jiangsu Provincial Key Laboratory of Advanced Micro and Nano Materials and Technology · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · Hunan innovative province construction special major landmark innovation demonstration project and Excellent Postdoctoral Innovative Talents Project of Hunan Province · Xiangtan science and technology project · Changsha Zhuzhou Xiangtan landmark engineering technology project · Key Laboratory of MEMS of Ministry of Education Southeast University
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