Hou Yanna, Zheng Fei, Yang Liu, Qi Xiaorong, Ma Guohua, Luo Zhenwang, Zhao Zhenfu, Wang Xu, Zhao Ziqi, Hu Ziyang
Department of Microelectronic Science and Engineering, School of Physical Science and Technology, Ningbo University, Ningbo 315211, China.
ACS Appl Mater Interfaces. 2025 Jan 15;17(2):3806-3817. doi: 10.1021/acsami.4c19544. Epub 2025 Jan 4.
Two-dimensional (2D) Ruddlesden-Popper perovskites (RPPs) have garnered significant attention due to their enhanced stability compared with their three-dimensional counterparts. However, the power conversion efficiency (PCE) of 2D perovskite solar cells (2D-PSCs) remains lower than that of 3D-PSCs. Understanding the microstructural evolution of 2D perovskite films during fabrication is essential for improving their performance. This study demonstrates that exposing bare 2D perovskite films to the atmosphere during device fabrication can significantly enhance the PCE of 2D-PSCs. The performance improvement is primarily attributed to the gradual evaporation of organic butylammonium (BA) spacer cations from the film as butylamine (BA) gas. This evaporation refines the film's composition and structure, leading to the spontaneous formation of larger- phase RPPs, which exhibit superior carrier mobility. Consequently, the PCE of 2D-PSCs is enhanced. This work offers new insights into the structural evolution of 2D RPP films under ambient conditions and provides a feasible strategy for optimizing the performance of 2D-PSCs and other optoelectronic devices.
二维（2D）Ruddlesden-Popper钙钛矿（RPPs）因其与三维钙钛矿相比具有更高的稳定性而备受关注。然而，二维钙钛矿太阳能电池（2D-PSCs）的功率转换效率（PCE）仍低于三维钙钛矿太阳能电池。了解二维钙钛矿薄膜在制备过程中的微观结构演变对于提高其性能至关重要。本研究表明，在器件制备过程中将裸露的二维钙钛矿薄膜暴露于大气中可以显著提高二维钙钛矿太阳能电池的功率转换效率。性能的提高主要归因于有机丁基铵（BA）间隔阳离子作为丁胺（BA）气体从薄膜中逐渐蒸发。这种蒸发改善了薄膜的组成和结构，导致自发形成更大相的RPPs，其表现出优异的载流子迁移率。因此，二维钙钛矿太阳能电池的功率转换效率得到提高。这项工作为二维RPP薄膜在环境条件下的结构演变提供了新的见解，并为优化二维钙钛矿太阳能电池和其他光电器件的性能提供了一种可行的策略。
