Qi Shuwen, Ge Chenghao, Wang Peng, Wu Bin, Zhao Yuping, Zhao Rongjun, Shafian Shafidah, Hua Yong, Xie Lin
School of Materials and Energy, Yunnan University, Kunming 650091, China.
Department of Physics, Center for Optoelectronics Engineering Research, Yunnan University, Kunming 650091, China.
ACS Appl Mater Interfaces. 2024 Sep 25;16(38):51037-51045. doi: 10.1021/acsami.4c08538. Epub 2024 Sep 11.
The latest development in perovskite solar cell (PSC) technology has been significantly influenced by advanced techniques aimed at passivating surface defects. This work presents a new approach called thermal imprinting-assisted ion exchange passivation (TIAIEP), which delivers a different approach to conventional solution-based methods. TIAIEP focuses on addressing surface imperfections in solid-state films by using a passivator that promotes ion exchange specifically at the defect sites within the perovskite layer. By adjusting the time and temperature of the TIAIEP process, we achieve substantial enhancement in the creation of a compositional gradient within the films. This optimization slows the cooling rate of hot carriers, leading to minimizing charge recombination and improving the device performance. Remarkably, devices treated with TIAIEP achieve a 22.29% power conversion efficiency and show outstanding stability, with unencapsulated PSCs maintaining 91% of their original efficiency after over 2000 h of storage and 90% efficiency after 1200 h of constant illumination. These results highlight TIAIEP's effectiveness in mitigating surface defects, improving both the photoelectric and stability performance of PSCs, and indicating significant potential for large-scale application in perovskite film passivation, promoting the widespread adoption of this technology.
钙钛矿太阳能电池（PSC）技术的最新进展受到旨在钝化表面缺陷的先进技术的显著影响。这项工作提出了一种称为热压印辅助离子交换钝化（TIAIEP）的新方法，它为传统的基于溶液的方法提供了一种不同的途径。TIAIEP专注于通过使用一种钝化剂来解决固态薄膜中的表面缺陷，这种钝化剂能促进钙钛矿层内缺陷部位的离子交换。通过调整TIAIEP工艺的时间和温度，我们在薄膜中实现了成分梯度的大幅增强。这种优化减缓了热载流子的冷却速率，从而最大限度地减少电荷复合并提高器件性能。值得注意的是，经过TIAIEP处理的器件实现了22.29%的功率转换效率，并表现出出色的稳定性，未封装的PSC在储存超过2000小时后保持其原始效率的91%，在持续光照1200小时后保持90%的效率。这些结果突出了TIAIEP在减轻表面缺陷、提高PSC的光电和稳定性性能方面的有效性，并表明其在钙钛矿薄膜钝化的大规模应用中具有巨大潜力，促进了该技术的广泛采用。
