Perovskite‐Inspired Materials (PIMs): Exploring Their Potential for Photovoltaic Applications

ABSTRACT Perovskite‐inspired materials (PIMs) have been investigated as alternatives to organic lead halide perovskites in order to explore novel lead‐free materials for photovoltaics. This review describes the structural and optoelectronic properties of PIMs including double perovskites, chalcohalides, rudorffites, bismuth halides, and defect‐ordered A 3 B 2 X 9 . Efforts have been recently made to overcome high carrier effective mass, non‐radiative recombination, and large bandgaps of PIMs, limiting the photovoltaic performance of PIM‐based solar cells. By analyzing the basis for the inferior performance observed by the PIMs, we propose strategies for enhancing the PIM‐based solar cells in terms of engineering bulk light‐absorbing PIM layers and their interfaces in order to provide insights into the design of future photovoltaic materials.