电偏置条件下干法钙钛矿太阳能电池电荷积累和离子迁移的电化学和光谱学分析

IF 4.8 2区 化学 Q2 CHEMISTRY, PHYSICAL
Haeyeon Jun, Denis Tondelier, Bernard Geffroy, Ileana Florea, Jean-Eric Bouree, Pilar Lopez-Varo, Philip Schulz, Yvan Bonnassieux, Sufal Swaraj
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引用次数: 0

摘要

我们通过电化学阻抗谱(EIS)和扫描透射 X 射线显微镜(STXM)技术,研究了电偏压对改变过氧化物太阳能电池(PSCs)化学成分和电性能的影响。EIS 揭示了界面上电荷积累的形成以及电阻和电容特性的变化。在长时间施加强电场偏压后对 PSC 进行的 STXM 研究表明,甲基铵(MA+)阳离子被击穿,促使碘离子迁移并在界面上形成缺陷。通过这项 EIS 和 STXM 互补研究,我们提出了一种降解机制,其中包括碘离子迁移导致界面缺陷,进而导致太阳能电池性能下降。此外,我们还研究了 PSC 在空气中的性能演变。我们观察到,随着在空气中老化,包晶体太阳能电池的电流-电压曲线上的滞后指数增加,填充因子降低。EIS 测量结果表明,碘离子的积累通过改变移动离子浓度和离子迁移率形成了电容层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Electrochemical and Spectro-Microscopic Analyses of Charge Accumulation and Ion Migration in Dry Processed Perovskite Solar Cells under Electrical Biasing

Electrochemical and Spectro-Microscopic Analyses of Charge Accumulation and Ion Migration in Dry Processed Perovskite Solar Cells under Electrical Biasing
We study the influence of electrical biasing on the modification of the chemical composition and electrical performance of perovskite solar cells (PSCs) by coupling electrochemical impedance spectroscopy (EIS) and scanning transmission X-ray microscopy (STXM) techniques. EIS reveals the formation of charge accumulation at the interfaces and changes in the resistive and capacitive properties. STXM study on PSCs after applying a strong electric field for a long biasing time indicates the breakdown of methylammonium (MA+) cation, promoting iodide ions to migrate and create defects at the interface. This complementary EIS and STXM study allows the suggestion of a degradation mechanism that includes the migration of iodide ions that leads to interface defects and subsequent degradation of solar cell performance. In addition, we study the evolution of the performance of PSCs under air. We observe an increased hysteresis index on current–voltage curves and fill factor reduction of the perovskite solar cells with aging in air. EIS measurements show the formation of a capacitive layer resulting from the accumulation of iodide ions through modification of the mobile ion concentration and ion mobility.
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来源期刊
The Journal of Physical Chemistry Letters
The Journal of Physical Chemistry Letters CHEMISTRY, PHYSICAL-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
9.60
自引率
7.00%
发文量
1519
审稿时长
1.6 months
期刊介绍: The Journal of Physical Chemistry (JPC) Letters is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, chemical physicists, physicists, material scientists, and engineers. An important criterion for acceptance is that the paper reports a significant scientific advance and/or physical insight such that rapid publication is essential. Two issues of JPC Letters are published each month.
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