Photocatalysis has attracted increasing scientifi c interest since it represents a promising path to combat the growing energy

crisis and environmental pollution problems. Among the various materials used in photocatalysis, perovskites have become

ideal photocatalysts due to their superior optoelectronic, morphologic, and physicochemical properties. However, pristine

perovskites still have issues, such as weak stability, limited carrier extraction, and restricted active sites. Therefore, various

strategies have been developed to improve the photocatalytic activity of pure perovskites in combination with other materials

to form more effi cient heterojunction composites. This review paper aims to report on the latest advances in the development,

characterization, and photocatalytic effi ciency of perovskite-based heterojunction composites coupled with binary and

ternary semiconductors, carbon materials, metal oxides, and sulfi des. The photocatalytic processes covered in this work are

CO 2 reduction, H 2 generation, and the degradation of organic pollutants. This study is expected to intensify research on the

development of perovskite-based composites and their future application to obtain chemicals of industrial interest, biofuels,

and clean water with perspective at pilot and industrial scale.