Perovskite-Based Photo-Supercapacitors as Self-Charging and Energy Storage Devices

The demand of self-charging supercapacitors is growing rapidly as portable electronic devices, which are also economically efficient. Owing to its abundant availability, solar energy is considered a green energy resource. Thus, integrating the energy harvesting and energy storage as a single device has attracted researchers worldwide, and such a device is known as a photo-supercapacitor. Many efforts have been made to assemble high-performance photo-supercapacitors. Perovskite-based oxides and halide perovskite materials have recently been used for supercapacitor applications. Several studies have used perovskites as dual-functional material that acts as a light absorber to generate electrons and the electrodes for supercapacitor function. In such an application, perovskite should have good ionic and electron conductivity properties because ion migration and electron charge transfer play important roles for dual-functional applications. It is worth mentioning that photoinduced charge transfer at the interface of perovskite/ electrode will affect additional photocapacitance and ion migration to contribute to the total specific capacitance. This book chapter will shed light on different types of perovskite-based materials, perovskite as a light absorber, studies on perovskite materials for supercapacitor applications, and the evaluation parameters of photo-supercapacitors.