Comparative Study of Distinct Halide Composites for Highly Efficient Cesium-Based Perovskite Solar Cells
Sagar Bhattarai, M. Khalid Hossain, Gazi Farhan Ishraque Toki, Dip Prakash Samajdar, Rahul Pandey, Jaya Madan, Mongi Amami
Abstract
In recent years, perovskite solar cells (PSCs) have appeared as frontrunners in the renewable photovoltaic (PV) landscape. This study presents a substantially improved perovskite material, showcasing enhanced optoelectronic performance and potential for streamlined fabrication processes. Our main focus lies in identifying the optimal cesium halide composition, in conjunction with TiO 2 and CuI as charge transport layers (CTLs), that yield the highest efficiency. Through meticulous optimization encompassing absorber thickness, CTL thickness, defect density, and interface properties, our findings reveal that CsPbI 2 Br-based PSCs exhibit a remarkable boost in power conversion efficiency (PCE) of approximately 15.52%. In contrast, CsPbBr 3 -based PSCs exhibit comparatively lower values for short-circuit current density ( J SC ) and open circuit voltage ( V OC ), which results in a PCE of 13.96%. This investigation extends to exploring various parameters, including temperature effects, impedance characteristics, series resistance, quantum efficiency (QE), and current–voltage ( J–V ) behavior. The comprehensive nature of this study bears substantial significance in advancing the efficient fabrication of cesium-based PSC devices. The demonstrated perovskite material holds immense promise across diverse applications in the foreseeable future, owing to its cost-effectiveness and favorable optical absorption properties.