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Effect of Ion Migration-Induced Electrode Degradation on the Operational Stability of Perovskite Solar Cells
ACS Omega ( IF 3.7 ) Pub Date : 2018-08-28 00:00:00 , DOI: 10.1021/acsomega.8b01626 Boris Rivkin 1, 2 , Paul Fassl 1, 2 , Qing Sun 1, 2 , Alexander D. Taylor 1, 2 , Zhuoying Chen 3 , Yana Vaynzof 1, 2
ACS Omega ( IF 3.7 ) Pub Date : 2018-08-28 00:00:00 , DOI: 10.1021/acsomega.8b01626 Boris Rivkin 1, 2 , Paul Fassl 1, 2 , Qing Sun 1, 2 , Alexander D. Taylor 1, 2 , Zhuoying Chen 3 , Yana Vaynzof 1, 2
Affiliation
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Perovskite-based solar cells are promising because of their rapidly improving efficiencies but suffer from instability issues. Recently, it has been claimed that one of the key contributors to the instability of perovskite solar cells is ion migration-induced electrode degradation, which can be avoided by incorporating inorganic hole-blocking layers (HBLs) in the device architecture. In this work, we investigate the operational environmental stability of methylammonium lead iodide perovskite solar cells that contain either an inorganic or organic HBL, with only the former effectively blocking ions from migrating to the metal electrode. This is confirmed by X-ray photoemission spectroscopy measured on the electrodes of degraded devices, where only electrodes of devices with an organic HBL show a significant iodine signal. Despite this, we show that when these devices are degraded under realistic operational conditions (i.e., constant illumination in a variety of atmospheric conditions), both types of devices exhibit nearly identical degradation behavior. These results demonstrate that contrary to prior suggestions, ion-induced electrode degradation is not the dominant factor in perovskite environmental instability under operational conditions.
中文翻译：
离子迁移诱导的电极降解对钙钛矿太阳能电池运行稳定性的影响
基于钙钛矿的太阳能电池因其效率的快速提高而前景广阔，但存在不稳定问题。最近，有人声称，钙钛矿太阳能电池不稳定性的关键因素之一是离子迁移引起的电极退化，这可以通过在器件架构中加入无机空穴阻挡层（HBL）来避免。在这项工作中，我们研究了含有无机或有机HBL的甲基铵碘化铅钙钛矿型太阳能电池的运行环境稳定性，只有前者有效地阻止了离子迁移到金属电极。通过在降解器件的电极上测量的X射线光发射光谱法可以证实这一点，其中只有具有有机HBL的器件的电极才会显示出明显的碘信号。尽管如此，我们表明，当这些设备在实际操作条件下（即在各种大气条件下持续照明）退化时，两种类型的设备都表现出几乎相同的退化行为。这些结果表明，与先前的建议相反，离子诱导的电极降解不是操作条件下钙钛矿环境不稳定性的主要因素。
更新日期：2018-08-28
中文翻译：
离子迁移诱导的电极降解对钙钛矿太阳能电池运行稳定性的影响
基于钙钛矿的太阳能电池因其效率的快速提高而前景广阔，但存在不稳定问题。最近，有人声称，钙钛矿太阳能电池不稳定性的关键因素之一是离子迁移引起的电极退化，这可以通过在器件架构中加入无机空穴阻挡层（HBL）来避免。在这项工作中，我们研究了含有无机或有机HBL的甲基铵碘化铅钙钛矿型太阳能电池的运行环境稳定性，只有前者有效地阻止了离子迁移到金属电极。通过在降解器件的电极上测量的X射线光发射光谱法可以证实这一点，其中只有具有有机HBL的器件的电极才会显示出明显的碘信号。尽管如此，我们表明，当这些设备在实际操作条件下（即在各种大气条件下持续照明）退化时，两种类型的设备都表现出几乎相同的退化行为。这些结果表明，与先前的建议相反，离子诱导的电极降解不是操作条件下钙钛矿环境不稳定性的主要因素。
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