FA/MA Cation Exchange for Efficient and Reproducible Tin-Based Perovskite Solar Cells,ACS Applied Materials & Interfaces

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FA/MA Cation Exchange for Efficient and Reproducible Tin-Based Perovskite Solar Cells
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-08-18 , DOI: 10.1021/acsami.1c11751
Fangjie Li _{1,

2,

3} , Xiaoyi Hou _{1,

2} , Zhen Wang ₁ , Xiaxia Cui ₁ , Guohua Xie ₄ , Feng Yan ₃ , Xing-Zhong Zhao ₂ , Qidong Tai ₁

Affiliation

Nontoxic tin-based perovskite solar cells (Sn-PSCs) as a promising alternative to toxic Pb-PSCs have drawn great attention in recent years for their environmental friendliness and unique optoelectronic properties. However, both the efficiency and long-term stability of Sn-PSCs are considerably inferior to those of Pb-based ones. One of the main reasons is the difficulty in obtaining high-quality Sn-perovskite films due to the rapid crystallization of Sn-perovskites, which also results in poor device reproducibility. Here, we report a novel cation exchange strategy to prepare high-quality formamidinium tin triiodide (FASnI₃) perovskite films with a better controlled crystallization process and improved reproducibility, which allows easy access to smooth and pinhole-free perovskite films with oriented crystal growth, enlarged grain size, and reduced trap-state density. The corresponding Sn-PSCs show excellent photovoltaic performance with a champion efficiency of 9.11%, comparable to the best results reported for FASnI₃-PSCs, and the devices also demonstrate outstanding long-term stability without encapsulation. Our results offer a practical strategy for fabricating Sn-PSCs with superb performance and stability.

中文翻译：

用于高效且可重复的锡基钙钛矿太阳能电池的 FA/MA 阳离子交换

无毒锡基钙钛矿太阳能电池 (Sn-PSCs) 作为有毒 Pb-PSCs 的有前途的替代品，近年来因其环境友好性和独特的光电特性而备受关注。然而，Sn-PSCs 的效率和长期稳定性都远不如 Pb 基的。主要原因之一是由于 Sn-钙钛矿快速结晶，难以获得高质量的 Sn-钙钛矿薄膜，这也导致器件再现性差。在这里，我们报告了一种新的阳离子交换策略来制备高质量的三碘化甲脒锡 (FASnI ₃) 钙钛矿薄膜具有更好的结晶过程可控性和更高的可重复性，可以轻松获得具有定向晶体生长、晶粒尺寸增大和陷阱态密度降低的光滑且无针孔的钙钛矿薄膜。相应的 Sn-PSC 显示出优异的光伏性能，最高效率为 9.11%，可与 FASnI ₃ -PSC报告的最佳结果相媲美，并且该器件还表现出出色的长期稳定性，无需封装。我们的结果为制造具有卓越性能和稳定性的 Sn-PSC 提供了实用的策略。

更新日期：2021-09-01

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