Unveiling the role of Cs ion in perovskite phase formation during solid–vapor reactions - Shenghan Hu; Peiran Hou; Changyu Duan; Shuang Zeng; Yichen Dou; Xinyu Deng; Yuxi Zhang; Jianfeng Lu; Yi-Bing Cheng; Yong Peng; Zhiliang Ku (Chemical Engineering Journal, 2024)