Future Research Directions in Perovskite Solar Cells: Exquisite Photon Management and Thermodynamic Phase Stability,Advanced Materials

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Future Research Directions in Perovskite Solar Cells: Exquisite Photon Management and Thermodynamic Phase Stability
Advanced Materials ( IF 27.4 ) Pub Date : 2022-07-15 , DOI: 10.1002/adma.202204807
Hui-Seon Kim ₁ , Nam-Gyu Park _{2,

3}

Affiliation

As power conversion efficiency (PCE) of perovskite solar cells (PSCs) has rapidly increased up to 25.7% in 2022, a curiosity about the achievable limit of the PCE has prevailed and demands understanding about the underlying fundamentals to step forward. Meanwhile, outstanding long-term stability of PSCs over 1000 h has been reported at operating conditions or under damp heat test with 85 °C/85% relative humidity. Herein comes the question as to whether the phase stability issue of perovskite crystal is completely resolved in the most recent state-of-the-art perovskite film or if it deceives everyone into believing so by significantly slowing the kinetics. On the one hand, the fundamental origins of a discrepancy between reported values and the theoretical limit are thoroughly examined, where the importance of light management is greatly emphasized with the introduction of external luminescence as a key parameter to narrow the gap. On the other hand, the phase stability of a perovskite film is understood from thermodynamic point of view to address viable approaches to lower the Gibbs free energy, distinguishing the kinetically trapped condition from the thermodynamically stable phase.

中文翻译：

钙钛矿太阳能电池的未来研究方向：精致的光子管理和热力学相稳定性

随着钙钛矿太阳能电池 (PSC) 的功率转换效率 (PCE) 在 2022 年迅速提高至 25.7%，人们对 PCE 可实现的极限感到好奇，并需要了解潜在的基本原理才能向前迈进。同时，PSC 在操作条件下或在 85 °C/85% 相对湿度的湿热测试下具有超过 1000 小时的出色长期稳定性。这里出现的问题是，钙钛矿晶体的相稳定性问题是否在最新的最先进的钙钛矿薄膜中得到了完全解决，或者它是否通过显着减慢动力学来欺骗所有人相信这一点。一方面，深入研究了报告值与理论极限之间差异的根本根源，其中通过引入外部发光作为缩小差距的关键参数，极大地强调了光管理的重要性。另一方面，从热力学角度理解钙钛矿薄膜的相稳定性，以找到降低吉布斯自由能的可行方法，区分动力学捕获条件和热力学稳定相。

更新日期：2022-07-15

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