论文标题
Shockley-Read-thall和ABC模型对铅卤化物钙钛矿有效吗？
Are Shockley-Read-Hall and ABC models valid for lead halide perovskites?
论文作者
论文摘要
金属卤化物钙钛矿是一类新兴的半导体类别。由于缺陷物理学和电荷重组机制知识有限，他们的电荷动态知之甚少。然而，经典的ABC和Shockley-Read-hall（SRH）模型无处不在地应用于perovskites，而无需考虑它们的有效性。在此，开发和使用了一种先进的技术映射光致发光量子量产率（PLQY）作为激发脉冲能量和重复频率的函数，以检查这些模型的有效性。尽管ABC和SRH无法解释在广泛条件下的电荷动力学，但增加螺旋钻重组并捕获到SRH模型中可以实现PLQY映射和低功率PL衰减动力学的定量拟合，并提取陷阱浓度和效率。高功率PL动力学需要包括其他非线性过程。本文开发的PLQY映射适用于对理论的全面测试，适用于任何半导体。
Metal halide perovskites are an important class of emerging semiconductors. Their charge dynamics is poorly understood due to limited knowledge of defect physics and charge recombination mechanisms. Nevertheless, classical ABC and Shockley-Read-Hall (SRH) models are ubiquitously applied to perovskites without considering their validity. Herein, an advanced technique mapping photoluminescence quantum yield (PLQY) as a function of both the excitation pulse energy and repetition frequency is developed and employed to examine the validity of these models. While ABC and SRH fail to explain the charge dynamics in a broad range of conditions, the addition of Auger recombination and trapping to the SRH model enables a quantitative fitting of PLQY maps and low-power PL decay kinetics, and extracting trap concentrations and efficacies. Higher-power PL kinetics requires the inclusion of additional non-linear processes. The PLQY mapping developed herein is suitable for a comprehensive testing of theories and is applicable to any semiconductor.
