Time-resolved photoluminescence studies of perovskite chalcogenides
Time-resolved photoluminescence studies of perovskite chalcogenides
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钙钛矿硫属化物的时间分辨光致发光研究
DOI：
10.1039/d2fd00047d
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发表时间：
2022
影响因子：
3.4
通讯作者：
Jaramillo, R.
中科院分区：
文献类型：
--
作者：
Ye, Kevin;Zhao, Boyang;Diroll, Benjamin T.;Ravichandran, Jayakanth;Jaramillo, R.
钙钛矿和相关晶体结构中的硫属化物（简称“硫属化物钙钛矿”）可用于未来的光电和能量转换技术，因为它们具有良好的激发态双极传输性质。近年来，一些研究表明Ba-Zr-S系统中的半导体具有缓慢的非辐射复合速率。在这里，我们提出了一个时间分辨的光致发光（TRPL）研究的激发态载流子迁移率和复合率的钙钛矿结构的材料BaZrS 3，和相关的Ruddlesden-Popper相Ba 3 Zr 2S 7。我们测量最先进的单晶样品，以确定不受第二相和随机晶界影响的性能。我们使用半导体物理模拟对数据进行建模和拟合，以便比经验数据建模更直接地确定关键材料参数。我们发现这两种材料在室温下具有约50 ns的Shockley-Read-Hall复合寿命和约5 μm的激发态扩散长度，这预示着包括薄膜太阳能电池在内的光电技术中的双极器件性能良好。
Chalcogenides in the perovskite and related crystal structures (“chalcogenide perovskites” for brevity) may be useful for future optoelectronic and energy-conversion technologies inasmuch as they have good excited-state, ambipolar transport properties. In recent years, several studies have suggested that semiconductors in the Ba–Zr–S system have slow non-radiative recombination rates. Here, we present a time-resolved photoluminescence (TRPL) study of excited-state carrier mobility and recombination rates in the perovskite-structured material BaZrS3, and the related Ruddlesden–Popper phase Ba3Zr2S7. We measure state-of-the-art single crystal samples, to identify properties free from the influence of secondary phases and random grain boundaries. We model and fit the data using a semiconductor physics simulation, to enable more direct determination of key material parameters than is possible with empirical data modeling. We find that both materials have Shockley–Read–Hall recombination lifetimes on the order of 50 ns and excited-state diffusion lengths on the order of 5 μm at room temperature, which bodes well for ambipolar device performance in optoelectronic technologies including thin-film solar cells.