Temperature-dependent photoluminescence spectra and decay dynamics or MAPbBr3 and MAPbI3 thin films
Temperature-dependent photoluminescence spectra and decay dynamics or MAPbBr3 and MAPbI3 thin films
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MAPbBr3 和 MAPbI3 薄膜的温度依赖性光致发光光谱和衰变动力学
DOI：
10.1063/1.5042489
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发表时间：
2018-09-01
期刊：
影响因子：
1.6
通讯作者：
Zheng, Lirong
中科院分区：
文献类型：
--
作者：
Liu, Yiting;Lu, Haizhou;Zheng, Lirong
在真空下，通过稳定控制样品温度，研究了甲基溴化铅碘(CH3NH3PbBr3或MAPbBr3)和CH3NH3PbI3(MAPbI(3))薄膜的稳态光谱和荧光寿命。根据结构的相变，光谱特征和寿命组分对温度非常敏感。我们的工作表明，卤化物阴离子I-和Br-导致了显著的光学性质差异。由于激子、电子-空穴对和自由载流子在衰变通道中的不同行为，MAPbI(3)比MAPbBr3具有更长的寿命和更高的低温荧光效率。这一发现为某些钙钛矿在各种环境温度条件下显示光伏或发光优势提供了可能的选择。(C)2018年作者(S)。
The steady-state spectra and fluorescence lifetimes are investigated under vacuum for methylammonium lead bromide and iodide (CH3NH3PbBr3 or MAPbBr(3), and CH3NH3PbI3 or MAPbI(3)) 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, MAPbI(3) has much longer lifetime and higher low-temperature fluorescence efficiency than those of MAPbBr(3). The findings provide possible choices for certain perovskites under various ambient temperature conditions to display photovoltaic or luminescent advantage. (C) 2018 Author(s).