Cho Junsang, DuBose Jeffrey T, Mathew Preethi S, Kamat Prashant V
Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA.
Chem Commun (Camb). 2021 Jan 7;57(2):235-238. doi: 10.1039/d0cc06217k. Epub 2020 Dec 11.
The role of chloride in improving the stability of mixed halide perovskites (MAPbClBrI) is probed using spectroelectrochemistry. The injection of holes into mixed halide perovskite films through applied anodic bias results in the selective migration of iodine with ultimate expulsion into the electrolyte. Increasing the Cl content (x = 0 to 0.1) in the mixed halide perovskite suppresses the iodine mobility and thus decreases the rate of its expulsion into the solution. Implications of iodine mobility induced by hole accumulation and its impact on overall stability is discussed.
利用光谱电化学研究了氯离子在提高混合卤化物钙钛矿（MAPbClBrI）稳定性方面的作用。通过施加阳极偏压将空穴注入混合卤化物钙钛矿薄膜中，会导致碘的选择性迁移，最终排入电解质中。增加混合卤化物钙钛矿中的氯含量（x = 0至0.1）可抑制碘的迁移率，从而降低其排入溶液的速率。讨论了空穴积累引起的碘迁移及其对整体稳定性的影响。
