Organic and inorganic hybrid perovskites with advantages of facile processing tunable bandgaps and superior charge-transfer properties, have emerged as a new class of revolutionary optoelectronic semiconductors materials. With the development of materials, the quantum yield of perovskite is closed to 100%. The rapid progress in material synthesis has promoted the development of optoelectronic applications including solar cell, light-emitting diodes, photodetectors, and transistors. Here we review the recent progress on mixed-cation perovskite including crystal structures, chemical synthesis of nanocrystals, device configurations and the optoelectronic properties. Mixed cations have opened a new path for the synthesis of perovskite nanocrystals with high quantum yield, and also provided a new idea for fabricating high brightness and high efficiency devices.
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