Ahmad Zubair, Mishra Arti, Abdulrahim Sumayya M, Taguchi D, Sanghyun Paek, Aziz Fakhra, Iwamoto M, Manaka T, Bhadra Jolly, Al-Thani Noora J, Nazeeruddin Mohammad Khaja, Touati Farid, Belaidi Abdelhak, Al-Muhtaseb Shaheen A
Center for Advanced Materials (CAM), Qatar University, 2713, Doha, Qatar.
Qatar University Young Scientists Center (YSC), Qatar University, 2713, Doha, Qatar.
Sci Rep. 2021 Jan 8;11(1):33. doi: 10.1038/s41598-020-79659-3.
Perovskite solar cells (PSCs) expressed great potentials for offering a feasible alternative to conventional photovoltaic technologies. 2D/3D hybrid PSCs, where a 2D capping layer is used over the 3D film to avoid the instability issues associated with perovskite film, have been reported with improved stabilities and high power conversion efficiencies (PCE). However, the profound analysis of the PSCs with prolonged operational lifetime still needs to be described further. Heading towards efficient and long-life PSCs, in-depth insight into the complicated degradation processes and charge dynamics occurring at PSCs' interfaces is vital. In particular, the Au/HTM/perovskite interface got a substantial consideration due to the quest for better charge transfer; and this interface is debatably the trickiest to explain and analyze. In this study, multiple characterization techniques were put together to understand thoroughly the processes that occur at the Au/HTM/perovskite interface. Inquest analysis using current-voltage (I-V), electric field induced second harmonic generation (EFISHG), and impedance spectroscopy (IS) was performed. These techniques showed that the degradation at the Au/HTM/perovskite interface significantly contribute to the increase of charge accumulation and change in impedance value of the PSCs, hence resulting in efficiency fading. The 3D and 2D/3D hybrid cells, with PCEs of 18.87% and 20.21%, respectively, were used in this study, and the analysis was performed over the aging time of 5000 h. Our findings propose that the Au/HTM/perovskite interface engineering is exclusively essential for attaining a reliable performance of the PSCs and provides a new perspective towards the stability enhancement for the perovskite-based future emerging photovoltaic technology.
钙钛矿太阳能电池（PSCs）在为传统光伏技术提供可行替代方案方面展现出巨大潜力。二维/三维混合PSCs，即在三维薄膜上使用二维覆盖层以避免与钙钛矿薄膜相关的稳定性问题，已被报道具有更高的稳定性和功率转换效率（PCE）。然而，对于具有延长使用寿命的PSCs的深入分析仍需进一步阐述。为了实现高效和长寿命的PSCs，深入了解PSCs界面处发生的复杂降解过程和电荷动力学至关重要。特别是，由于对更好的电荷转移的追求，金/空穴传输层/钙钛矿界面受到了大量关注；并且这个界面可以说是最难解释和分析的。在本研究中，综合运用了多种表征技术，以全面了解金/空穴传输层/钙钛矿界面处发生的过程。使用电流 - 电压（I - V）、电场诱导二次谐波产生（EFISHG）和阻抗谱（IS）进行了探究分析。这些技术表明，金/空穴传输层/钙钛矿界面处的降解显著导致了PSCs电荷积累的增加和阻抗值的变化，从而导致效率衰减。本研究使用了三维和二维/三维混合电池，其PCE分别为18.87%和20.21%，并在5000小时的老化时间内进行了分析。我们的研究结果表明，金/空穴传输层/钙钛矿界面工程对于实现PSCs的可靠性能至关重要，并为基于钙钛矿的未来新兴光伏技术的稳定性增强提供了新的视角。
