All-inorganic cesium (Cs)-based perovskites have been considered as one of the most popular research directions in the community of perovskite photovoltaic devices over the recent years because of their more competitive environmental stability in comparison with the traditional organic-inorganic hybrid perovskite candidates. Since the first attempt for the all-inorganic photovoltaic solar cell in 2014, the recently stabilized device efficiency has exceeded 20% and a large number of relevant researches have been reported. Different optimization strategies, including component replacement, addit...
