Perovskite grain wrapping by converting interfaces and grain boundaries into robust and water-insoluble low-dimensional perovskites
Perovskite grain wrapping by converting interfaces and grain boundaries into robust and water-insoluble low-dimensional perovskites
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DOI：
10.1126/sciadv.abq4524
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发表时间：
2022-12-02
期刊：
影响因子：
13.6
通讯作者：
Huang, Jinsong
中科院分区：
文献类型：
--
作者：
Jiao, Haoyang;Ni, Zhenyi;Huang, Jinsong
稳定钙钛矿太阳能电池需要考虑器件中的所有缺陷部位。大量的努力已经投入到界面，而稳定的晶界得到较少的关注。在这里，我们报告了一种分子三丁基（甲基）碘化鏻（TPI），它可以将钙钛矿转化为机械坚固且不溶于水的宽带隙一维（1D）钙钛矿。TPI与钙钛矿前体混合导致钙钛矿晶粒的包裹，其中晶粒表面和晶界在晶粒形成过程中转化为几个纳米厚的1D钙钛矿，如通过直接映射观察到的。晶粒包裹钝化了晶界，增强了它们的防潮性，并减少了光浸泡过程中释放的碘。具有包裹颗粒的钙钛矿薄膜在热和光下更稳定。在55 ℃开路条件下，在1个太阳光照下光浸泡1900小时后，包裹颗粒的最佳器件保持其最高效率的92.2%。
Stabilizing perovskite solar cells requires consideration of all defective sites in the devices. Substantial efforts have been devoted to interfaces, while stabilization of grain boundaries received less attention. Here, we report on a molecule tributyl(methyl)phosphonium iodide (TPI), which can convert perovskite into a wide bandgap one-dimensional (1D) perovskite that is mechanically robust and water insoluble. Mixing TPI with perovskite precursor results in a wrapping of perovskite grains with both grain surfaces and grain boundaries converted into several nanometer-thick 1D perovskites during the grain formation process as observed by direct mapping. The grain wrapping passivates the grain boundaries, enhances their resistance to moisture, and reduces the iodine released during light soaking. The perovskite films with wrapped grains are more stable under heat and light. The best device with wrapped grains maintained 92.2% of its highest efficiency after light soaking under 1-sun illumination for 1900 hours at 55 degrees C open-circuit condition.