The increasing global energy demand requires the coordinated development of energy conversion and energy storage materials. Metal halide perovskites have emerged as strong semiconductor candidates for both applications. While metal halide perovskites have received much attention for a range of energy conversion devices, there is a limited use of these materials in energy storage devices. This review summarizes the current status of metal halide perovskites for Li-ion battery and supercapacitor applications while mainly focusing on the device architecture, synthesis method, and material properties. Special attention is placed on the impact of the morphology, defect density and doping of the perovskite active layer on the performance of these devices. Finally, perspectives for the further development of this field are proposed.
The small perturbation frequency‐resolved techniques have been powerful tools in unraveling the kinetic processes governing the operation of perovskite solar cells (PSCs). One such technique is electrochemical impedance spectroscopy (EIS). However, a thorough interpretation of the EIS response of PSCs is still lacking owing to the absence of a uniform electrical equivalent circuit. In this context, intensity‐modulated photocurrent/photovoltage spectroscopy (IMPS/IMVS) can be the link between the optical and electrical responses of PSCs and complement the IS technique. In this review, the progress made in interpreting the IMPS/IMVS response of various types of PSCs is summarized and diverse prospects are discussed. First, the basic theory and models present in the literature are discussed. Next, the IMPS/IMVS response of mesoporous and planar PSCs based on various physical parameters is discussed. At last, proposed future prospects for the development of this field are discussed.
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