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Strong Band-Filling Induced Significant Excited State Absorption in MAPbI3 under High Pump Power
Materials Today Physics ( IF 11.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.mtphys.2020.100228
B.A. Chen , G.T. Pang , X.Q. Lan , Z.B. He , R. Chen

Abstract Perovskite has been considered as promising material for solar cell application. Understanding the carrier dynamics in perovskite material plays a vital role for further improvement of the power conversion efficiency of solar cells. In this article, carrier dynamics of MAPbI3 under different pump powers have been investigated by ultrafast pump-probe transient absorption spectroscopy. Complete processes of carrier cooling and recombination under different pump powers have been characterized and compared carefully. It is found that a significant carrier band filling happened during cooling process under high pump power, which results in a strong excited state absorption at the photon energy of 2.353 eV. High carrier density induced strong Auger effect appears not only in the band edge but also the higher conduction band. And subsequently, a large part of carriers keeps hot for more than 5 ns indicating that MAPbI3 is meaningful for hot carrier extraction in solar cells. A critical carrier concentration of 9.32 × 1017 cm−3 has been determined at which Auger effect starts to work. It could provide some guidance for perovskite solar cell application.

中文翻译:

在高泵浦功率下强带填充引起 MAPbI3 中的显着激发态吸收

摘要 钙钛矿被认为是太阳能电池应用的有前途的材料。了解钙钛矿材料中的载流子动力学对于进一步提高太阳能电池的功率转换效率起着至关重要的作用。在本文中,通过超快泵浦-探针瞬态吸收光谱研究了不同泵浦功率下 MAPbI3 的载流子动力学。对不同泵功率下载流子冷却和复合的完整过程进行了表征和比较。发现在高泵浦功率下的冷却过程中发生了显着的载流子带填充,导致在2.353 eV的光子能量下产生强烈的激发态吸收。高载流子密度引起的强俄歇效应不仅出现在能带边缘,而且出现在更高的导带。随后,大部分载流子保持热态超过 5 ns,表明 MAPbI3 对太阳能电池中的热载流子提取有意义。已经确定了 9.32 × 1017 cm - 3 的临界载流子浓度,俄歇效应开始起作用。它可以为钙钛矿太阳能电池的应用提供一些指导。
更新日期:2020-08-01
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