Chiang Chien-Hung, Wu Chun-Guey
ACS Nano. 2018 Oct 23;12(10):10355-10364. doi: 10.1021/acsnano.8b05731. Epub 2018 Oct 8.
The quality of the perovskite absorber is known to be the most crucial parameter for the photovoltaic performance of perovskite solar cells. By combining the one-step anti-solvent engineering method followed by gas blowing, MAPbI film containing highly oriented multi-crystalline nanograins (150∼500 nm) was made first. A user-friendly, simple, large-throughput, and reproducible post-solvent annealing (made by treating the film with anti-solvent containing HO under spinning) was used to enlarge the perovskite grains up to 1.5 μm. Inverted (p-i-n) perovskite solar cells based on this highly ordered, large-grain MAPbI film achieve the highest efficiency of 21% with an extremely high fill factor (FF) of 86%. The high-efficiency cell shows almost no current hysteresis and is stable under 1 sun illustration in a glovebox or standing in the ambient atmosphere (20∼25 °C, ca. 30% humidity) under room lighting (T5 lamp, 500 lux). A creative method combining the gas blowing with quick and simple post-treatment to prepare a highly oriented MAPbI film with large multi-crystalline grains to achieve excellent photovoltaic performance was demonstrated. This creative film-preparation method was also successfully applied to fabricate large area MAPbI film for high-efficiency perovskite mini-modules. Being able to control the crystallization and growth of perovskite crystallites definitely makes the fabrication of perovskite solar cells more reproducible.
已知钙钛矿吸收层的质量是钙钛矿太阳能电池光伏性能的最关键参数。通过结合一步反溶剂工程方法并随后进行吹气，首先制备了含有高度取向的多晶纳米颗粒（150∼500 nm）的MAPbI薄膜。采用一种用户友好、简单、高通量且可重复的后溶剂退火方法（通过在旋转下用含HO的反溶剂处理薄膜制成）将钙钛矿晶粒扩大至1.5μm。基于这种高度有序的大晶粒MAPbI薄膜的倒置（p-i-n）钙钛矿太阳能电池实现了21%的最高效率以及86%的极高填充因子（FF）。这种高效电池几乎没有电流滞后现象，并且在手套箱中1个太阳光照下或在室内照明（T5灯，500勒克斯）下置于环境大气（20∼25°C，约30%湿度）中时保持稳定。展示了一种将吹气与快速简单的后处理相结合的创新方法，以制备具有大的多晶晶粒的高度取向MAPbI薄膜，从而实现优异的光伏性能。这种创新的薄膜制备方法也成功应用于制造用于高效钙钛矿微型模块的大面积MAPbI薄膜。能够控制钙钛矿微晶的结晶和生长无疑使钙钛矿太阳能电池的制造更具可重复性。
