Center for Advanced Materials (CAM), Qatar University, Doha 2713, Qatar.
Qatar University Young Scientists Center (YSC), Qatar University, Doha 2713, Qatar.
Molecules. 2020 Dec 8;25(24):5794. doi: 10.3390/molecules25245794.
Despite the remarkable progress in perovskite solar cells (PSCs), their instability and rapid degradation over time still restrict their commercialization. A 2D capping layer has been proved to overcome the stability issues; however, an in-depth understanding of the complex degradation processes over a prolonged time at PSC interfaces is crucial for improving their stability. In the current work, we investigated the stability of a triple cation 3D ([(FAMA)Cs]Pb(IBr)) and 2D/3D PSC fabricated by a layer-by-layer deposition technique (PEAI-based 2D layer over triple cation 3D perovskite) using a state-of-art characterization technique: electrochemical impedance spectroscopy (EIS). A long-term stability test over 24 months was performed on the 3D and 2D/3D PSCs with an initial PCE of 18.87% and 20.21%, respectively, to suggest a more practical scenario. The current-voltage (J-V) and EIS results showed degradation in both the solar cell types; however, a slower degradation rate was observed in 2D/3D PSCs. Finally, the quantitative analysis of the key EIS parameters affected by the degradation in 3D and 2D/3D PSCs were discussed.
尽管钙钛矿太阳能电池 (PSCs) 取得了显著的进展，但它们的不稳定性和随时间快速降解仍然限制了它们的商业化。二维 (2D) 盖帽层已被证明可以克服稳定性问题；然而，深入了解长时间在 PSC 界面上的复杂降解过程对于提高其稳定性至关重要。在当前工作中，我们使用最先进的表征技术——电化学阻抗谱 (EIS)，研究了通过层层沉积技术 (PEAI 二维层覆盖三阳离子 3D 钙钛矿) 制备的三重阳离子 3D([(FAMA)Cs]Pb(IBr))和 2D/3D PSC 的稳定性。对初始光电转换效率 (PCE) 分别为 18.87%和 20.21%的 3D 和 2D/3D PSC 进行了长达 24 个月的长期稳定性测试，以模拟更实际的情况。电流-电压 (J-V) 和 EIS 结果表明两种类型的太阳能电池都存在降解现象；然而，在 2D/3D PSC 中观察到降解速度较慢。最后，讨论了 3D 和 2D/3D PSC 降解对关键 EIS 参数的定量分析。
