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Efficient and Stable 2D@3D/2D Perovskite Solar Cells Based on Dual Optimization of Grain Boundary and Interface
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-20 , DOI: 10.1021/acsenergylett.1c01649 Guodong Li 1 , Jing Song 1 , Jihuai Wu 1 , Zeyu Song 1 , Xiaobing Wang 1 , Weihai Sun 1 , Leqing Fan 1 , Jianming Lin 1 , Miaoliang Huang 1 , Zhang Lan 1 , Peng Gao 2
ACS Energy Letters ( IF 19.3 ) Pub Date : 2021-09-20 , DOI: 10.1021/acsenergylett.1c01649 Guodong Li 1 , Jing Song 1 , Jihuai Wu 1 , Zeyu Song 1 , Xiaobing Wang 1 , Weihai Sun 1 , Leqing Fan 1 , Jianming Lin 1 , Miaoliang Huang 1 , Zhang Lan 1 , Peng Gao 2
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The development of perovskite solar cells has been faster than that of other photovoltaic cells, but their practical application is limited by further improvements in their performance and stability. A 3D/2D hybrid perovskite, combining the high efficiency of a 3D perovskite and the prominent stability of a 2D perovskite, is very promising. Herein, a strategy is designed by introducing 2-(2-pyridyl)ethylamine (2-PyEA) molecules with 2D structure and N atoms with a lone electron pair into perovskite. As an additive, 2-PyEA promotes the generation of 2D@3D perovskite; as a post-treated modifier, 2-PyEA facilitates the formation of 2D@3D/2D perovskite. The grain boundary and interface thus are dual-optimized in 2D@3D/2D perovskite by 2-PyEA. It is verified that defect density is reduced, residual stress is relieved, gradient energy is generated, charge transfer is improved, and carrier life is extended. Consequently, the dual-optimized PSC achieves a maximum power conversion efficiency of 23.2% with a negligible hysteresis and satisfactory stability, demonstrating a wonderful effect of 2-PyEA in forming efficient and stable PSCs.
中文翻译：
基于晶界和界面双重优化的高效稳定2D@3D/2D钙钛矿太阳能电池
钙钛矿太阳能电池的发展速度比其他光伏电池快，但其实际应用受到性能和稳定性进一步提高的限制。3D/2D 混合钙钛矿结合了 3D 钙钛矿的高效率和 2D 钙钛矿的突出稳定性，非常有前途。在此，通过将具有 2D 结构和具有孤电子对的 N 原子的 2-(2-吡啶基) 乙胺 (2-PyEA) 分子引入钙钛矿，设计了一种策略。作为添加剂，2-PyEA 促进了 2D@3D 钙钛矿的生成；作为后处理改性剂，2-PyEA 促进了 2D@3D/2D 钙钛矿的形成。因此，2-PyEA 在 2D@3D/2D 钙钛矿中对晶界和界面进行了双重优化。验证了缺陷密度降低，残余应力释放，产生梯度能量，改善电荷转移，延长载流子寿命。因此，双重优化的 PSC 实现了 23.2% 的最大功率转换效率，具有可忽略的滞后和令人满意的稳定性，证明了 2-PyEA 在形成高效稳定的 PSC 方面的出色效果。
更新日期：2021-10-08
中文翻译：
基于晶界和界面双重优化的高效稳定2D@3D/2D钙钛矿太阳能电池
钙钛矿太阳能电池的发展速度比其他光伏电池快，但其实际应用受到性能和稳定性进一步提高的限制。3D/2D 混合钙钛矿结合了 3D 钙钛矿的高效率和 2D 钙钛矿的突出稳定性，非常有前途。在此，通过将具有 2D 结构和具有孤电子对的 N 原子的 2-(2-吡啶基) 乙胺 (2-PyEA) 分子引入钙钛矿，设计了一种策略。作为添加剂，2-PyEA 促进了 2D@3D 钙钛矿的生成；作为后处理改性剂，2-PyEA 促进了 2D@3D/2D 钙钛矿的形成。因此，2-PyEA 在 2D@3D/2D 钙钛矿中对晶界和界面进行了双重优化。验证了缺陷密度降低，残余应力释放，产生梯度能量，改善电荷转移，延长载流子寿命。因此，双重优化的 PSC 实现了 23.2% 的最大功率转换效率，具有可忽略的滞后和令人满意的稳定性，证明了 2-PyEA 在形成高效稳定的 PSC 方面的出色效果。
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