Nonlinear Photocurrent Spectroscopy of Layered 2D Perovskite Quantum Wells
Nonlinear Photocurrent Spectroscopy of Layered 2D Perovskite Quantum Wells
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层状二维钙钛矿量子阱的非线性光电流光谱
DOI：
10.1021/acs.jpclett.9b02959
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Moran, Andrew M.
中科院分区：
文献类型：
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作者：
Zhou, Ninghao;Hu, Jun;Ouyang, Zhenyu;Williams, Olivia F.;Yan, Liang;You, Wei;Moran, Andrew M.
二维相干光电流光谱直接探测与光伏器件性能相关的电子状态和过程。在这篇论文中，我们将双脉冲非线性光电流光谱应用于基于层状钙钛矿量子阱的光伏器件。该方法有效地将光伏响应分解为来自单独量子阱和激发态种（即单激子或双激子）的贡献。我们的实验表明，光电流的产生效率随着量子阱的大小而增加。总的来说，结果表明，层状钙钛矿中的能量漏斗过程，在瞬态吸收光谱中最为突出，在很大程度上与光伏电池的功能无关。
Two-dimensional coherent photocurrent spectroscopies directly probe the electronic states and processes that are relevant to the performance of a photovoltaic device. In this Letter, we apply two-pulse nonlinear photocurrent spectroscopy to a photovoltaic device based on layered perovskite quantum wells. The method effectively decomposes the photovoltaic response into contributions from separate quantum wells and excited-state species (i.e., either single excitons or biexcitons). Our experiments show that the efficiency of photocurrent generation increases with the size of the quantum well. Overall, the results suggest that energy funneling processes in layered perovskites, which are most prominent in transient absorption spectroscopies, are largely irrelevant to the function of a photovoltaic cell.