Smooth and Compact FASnI3 Films for Lead-Free Perovskite Solar Cells with over 14% Efficiency,ACS Energy Letters

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Smooth and Compact FASnI3 Films for Lead-Free Perovskite Solar Cells with over 14% Efficiency
ACS Energy Letters ( IF 19.3 ) Pub Date : 2022-05-24 , DOI: 10.1021/acsenergylett.2c00776
Zihao Zhu ₁ , Xianyuan Jiang ₁ , Danni Yu ₁ , Na Yu ₁ , Zhijun Ning ₁ , Qixi Mi ₁

Affiliation

Currently, the highest-performing lead-free perovskite solar cells utilize the element tin. Tin halide perovskites, typically FASnI₃, resemble their lead-based counterparts in optoelectronic properties but possess dissimilar crystallization kinetics. To tackle the usually poor film quality, we introduced trimethylthiourea (3T) to the spin coating of FASnI₃ films. This bifunctional ligand greatly improved the morphology and texture of FASnI₃ films by spreading and joining individual crystal grains. Accordingly, the charge-carrier lifetime of 3T-treated films reached a record high of 123 ns, and the open-circuit voltage at 0.92 V was only 0.2 V short of the theoretical limit, both approaching those of lead halide perovskites. The certified power conversion efficiency at 14.0% and the stability against humid air are also among the best for FASnI₃ solar cells. Possible reasons for the efficacy of 3T through H-bonding are discussed. These findings emphasize film deposition control for tin halide perovskites and give direction to future developments.

中文翻译：

用于无铅钙钛矿太阳能电池的光滑紧凑的 FASnI3 薄膜，效率超过 14%

目前，性能最高的无铅钙钛矿太阳能电池使用锡元素。卤化锡钙钛矿，通常是 FASnI ₃，在光电特性方面类似于它们的铅基对应物，但具有不同的结晶动力学。为了解决通常较差的薄膜质量，我们将三甲基硫脲 (3T) 引入到 FASnI ₃薄膜的旋涂中。这种双功能配体极大地改善了 FASnI _{3的形态和质地}通过散布和连接单个晶粒来形成薄膜。因此，3T处理薄膜的电荷载流子寿命达到创纪录的123 ns，0.92 V的开路电压仅比理论极限低0.2 V，均接近卤化铅钙钛矿。经认证的 14.0% 的功率转换效率和对潮湿空气的稳定性也是 FASnI ₃太阳能电池中最好的。讨论了通过氢键实现 3T 功效的可能原因。这些发现强调了对卤化锡钙钛矿的薄膜沉积控制，并为未来的发展指明了方向。

更新日期：2022-05-24

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