Temperature-dependent photoluminescence spectra and decay dynamics of MAPbBr3 and MAPbI3 thin films
Source abstract
Abstract
The steady-state spectra and fluorescence lifetimes are investigated under vacuum for methylammonium lead bromide and iodide (CH3NH3PbBr3 or MAPbBr3, and CH3NH3PbI3 or MAPbI3) thin films by stably controlling the sample temperature in the range of 78 K to 320 K. The transformation of spectrum features and lifetime components are proved to be quite sensitive to the temperatures in accordance with the phase transition of structures. Our work demonstrates that the halide anions I- and Br- lead to remarkable differences on optical characteristics. Due to the distinct behaviors of excitons, electron-hole pairs and free carriers in decay channels, MAPbI3 has much longer lifetime and higher low-temperature fluorescence efficiency than those of MAPbBr3. The findings provide possible choices for certain perovskites under various ambient temperature conditions to display photovoltaic or luminescent advantage.
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Research context
OpenAlex topics: Perovskite Materials and Applications · Optical properties and cooling technologies in crystalline materials · Solid-state spectroscopy and crystallography
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
State Key Laboratory of Precision Spectroscopy, East China Normal University 1 , Shanghai 200062, China
Center of Micro-Nano System, SIST, Fudan University 2 , Shanghai 200433, China
State Key Laboratory of Surface Physics and Department of Physics, Fudan University 3 , Shanghai 200433, China
Collaborative Innovation Center of Extreme Optics, Shanxi University 4 , Taiyuan, Shanxi 030006, China
Department of Optical Science and Engineering, Fudan University 5 , Shanghai 200433, China
Funding
Open Project of the State Key Laboratory of Luminescence and Applications · the National Basic Research Program of China · the National Key R&D Program of China · the National Natural Science Foundation of China
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