Rethinking the A cation in halide perovskites.
Jin-Wook LeeShaun TanSang Il SeokYang YangNam Gyu ParkPublished in: Science (New York, N.Y.) (2022)
The A cation in ABX 3 organic-inorganic lead halide perovskites (OLHPs) was conventionally believed to hardly affect their optoelectronic properties. However, more recent developments have unraveled the critical role of the A cation in the regulation of the physicochemical and optoelectronic properties of OLHPs. We review the important breakthroughs enabled by the versatility of the A cation and highlight potential opportunities and unanswered questions related to the A cation in OLHPs.