The Metal doping Strategy in All Inorganic Lead Halide Perovskites: Synthesis, Physicochemical Properties, and Optoelectronic Applications

All inorganic perovskites CsPbX3 (X=Cl, Br, I), a rising star of optical materials, have shown promising application prospects in optoelectronic and photovoltaic fields. However, some open issues still exist in these perovskites, like poor long-term stability, inevitable intrinsic defects and much nonradiative recombination, which greatly weakens their optical capability and seriously hinders their further development. Metal doping strategy, through the partial substitution of foreign ions for native ions, has gradually become an effective method for significantly enhancing the comprehensive properties of CsPbX3. Whereas some previous researches have reported the impressive properties of metal-doped CsPbX3, there still lacks a comprehensive review on the influence of metal doping on CsPbX3. In this review, we aim to provide a systematical review of the latest achievements on metal-doped CsPbX3, which focuses on their synthetic methods and the positive effects of metal doping on structure, optical properties, morphology control, carrier behavior and related optoelectronic and photovoltaic devices. Finally, we put forward a few opportunities and challenges about the further investigation of metal-doped perovskites, which may help researchers explore new research directions.