Facet Engineering for Stable and Efficient Perovskite Solar Cells

Since the first report on 9.7 percent efficient solid state perovskite solar cell in 2012 by our group, the record power conversion efficiency of 26.1 percent was reported in 2023. In addition, more than 33 percent was demonstrated from a tandem structure with silicone bottom cell in 2023. This underlines that commercialization of perovskite solar cells is just around the corner. However, long-term stability is still challenging. To achieve highly stable perovskite solar cells, several approaches have been proposed and tried. Among them, we report here the facet engineering approach to improve stability of perovskite solar cells. Dependence of photocurrent generation, moisture stability and passivation on perovskite facets will be discussed in detail.