Investigating the synergistic characteristics of air processable CsPbIBr₂ perovskite electrodes for solar cell and energy storage applications

Mixed halide perovskite materials exhibited excellent optoelectronic, ionic, and electronic properties, extending the possibility of introducing them as an efficient electrode material for energy storage and conversion applications. In this work, we performed the synthesis of CsPbIBr₂ in ambient conditions and investigated its characteristics for solar cells and energy storage devices. The X-ray diffraction (XRD) technique is employed for the structural characterization of the as-synthesized perovskite crystals. The optical bandgap of ⁓ 2.1 eV is revealed utilizing UV-Vis, photoluminescence (PL), and diffuse reflectance (DR) spectroscopies. The photovoltaic performance of the as-synthesized CsPbIBr₂ perovskite for solar cell devices is initially tuned by varying precursor solution quantity to obtain the optimum performance. The optimized PCE of 6.2% is achieved for the device without a hole transport layer (HTL) and with carbon as the counter electrode. Impedance spectroscopy (IS) is employed to investigate the impact of solution quantity on interfacial charge transport kinetics. Further, the electrochemical properties of the perovskite are elucidated by analyzing cyclic voltammetry (CV) voltammograms, and galvanostatic charge-discharge (GCD) curves recorded at different scan rates and current densities, respectively. The specific capacity of 570 C/g is recorded under dark conditions. Our findings demonstrate the dual applications of the perovskites and will pave a pathway to develop new potential electrode materials based on perovskite for energy conversion and storage devices.