Electrochemical characterization of halide perovskites: Stability & doping
Electrochemical characterization of halide perovskites: Stability & doping
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DOI：
10.1016/j.mtadv.2022.100213
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发表时间：
2022-02-01
影响因子：
10
通讯作者：
Slinker, Jason D.
中科院分区：
文献类型：
--
作者：
Jha, Sauraj;Hasan, Mehedhi;Slinker, Jason D.
由于卤化物钙钛矿材料已经出现在光电子学发展的最前沿，因此需要不断了解其基础物理并控制其涌现特性。电化学显示出通过掺杂获得钙钛矿的基本参数和提高其性能的希望。然而，卤化物钙钛矿对基于溶液的电化学提出了重大挑战，因为水溶液和有机溶剂通常对这些材料的薄膜具有破坏性。这项工作提供了一个视角，最近的电化学测量方法和卤化物钙钛矿的改性，特别关注稳定性和掺杂。我们还报告了电化学甲基铵碘化铅（MAPbI 3）薄膜相关的太阳能应用与溶剂工具包的基础上氢氟醚。从电化学表征中揭示了氧化和还原峰，表现出特征HOMO/LUMO能级和附加特征。发现这种电化学驱动对薄膜的光致发光或底层形态几乎没有影响。最后，电化学锂盐掺杂这种溶剂工具包提高了近两个数量级的薄膜器件的导电性，证明了这种方法的光电应用的实用性。(c)2022作者由爱思唯尔有限公司出版。这是一篇开放获取的文章，使用CC BY许可证（http：//creativecommons.org/licenses/by/4.0/）。
As halide perovskite materials have emerged at the forefront of optoelectronics development, there is an ongoing need to understand their underlying physics and control their emergent properties. Electrochemistry shows promise to both access fundamental parameters of perovskites and to enhance their performance through doping. However, halide perovskites pose a significant challenge to solution-based electrochemistry, as both aqueous solutions and organic solvents are often destructive to thin films of these materials. This work provides a perspective of recent approaches to electrochemical measurements and modifications of halide perovskites with a specific focus on stability and doping. We also report the electrochemistry of methylammonium lead iodide (MAPbI3) thin films relevant for solar applications with a solvent toolkit based on hydrofluoroethers. Both oxidation and reduction peaks are revealed from electrochemical characterization exhibiting the characteristic HOMO/LUMO levels and additional features. This electrochemical driving is found to have little impact on the photoluminescence or underlying morphology of the thin films. Finally, electrochemical lithium salt doping with this solvent toolkit enhanced the conductivity of a thin film device by nearly two orders of magnitude, demonstrating the utility of this approach for optoelectronic applications. (c) 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).