Guo Jingwei, Wang Yulong, Guo Haikuo, Ren Xiaoqi, Ning Xuli, Wei Jiali, Yang Haoran, Li Tiantian, Zhu Chengjun, Hou Fuhua
Opt Express. 2024 May 20;32(11):19645-19654. doi: 10.1364/OE.519251.
Over the past decade, perovskite solar cells (PSCs) have attracted enormous attention due to their high performance. One key to fabricating high-quality perovskite films lies in controlling the volatilization rate of residual solvents during the annealing process. This study systematically investigates how different protective substrates affect the volatilization rate of residual solvent in perovskite films. By adjusting the direction and rate of evaporation, the supersaturation time of the solution was precisely controlled, leading to effective recrystallization of the grains. Concurrently, the annealing time was optimized to enhance film quality further. This optimization aimed to increase crystallinity, reduce defects, and thereby minimize non-radiative recombination centers. Implementing these methodologies, particularly the use of filter paper as a protective substrate during a 2-minute annealing process, significantly improved the fill factor (FF) and open-circuit voltage (V) of the PSCs. This led to a remarkable 5.26% improvement in power conversion efficiency (PCE) compared to control devices. The strategies employed in this work demonstrate significant potential in improving PSC film quality. This approach not only advances our understanding of film formation dynamics but also provides a practical guideline for future PSC fabrication.
在过去十年中，钙钛矿太阳能电池（PSCs）因其高性能而备受关注。制备高质量钙钛矿薄膜的一个关键在于控制退火过程中残留溶剂的挥发速率。本研究系统地研究了不同的保护衬底如何影响钙钛矿薄膜中残留溶剂的挥发速率。通过调整蒸发方向和速率，精确控制了溶液的过饱和时间，从而实现了晶粒的有效重结晶。同时，对退火时间进行了优化，以进一步提高薄膜质量。这种优化旨在提高结晶度、减少缺陷，从而最大限度地减少非辐射复合中心。采用这些方法，特别是在2分钟退火过程中使用滤纸作为保护衬底，显著提高了PSCs的填充因子（FF）和开路电压（V）。与对照器件相比，功率转换效率（PCE）显著提高了5.26%。本工作中采用的策略在提高PSC薄膜质量方面显示出巨大潜力。这种方法不仅增进了我们对成膜动力学的理解，还为未来PSC的制备提供了实用指南。
