Numerical optimization of HTL-free Cs2AgBiBr6 double perovskite solar cells

Abstract

Abstract The growing need for sustainable and clean energy has fueled important developments in photovoltaic technology. Because of its improved environmental stability and lead-free makeup, double perovskite solar cells (PSCs) have become one of the most attractive options for next-generation photovoltaics. This study investigates the performance of carbon-based, hole-transport-layer-free (HTL-free) Cs₂AgBiBr₆ PSCs through numerical simulations using SCAPS-1D. The device optimization concentrates on important parameters such absorber thickness, defect density, doping concentration, and operating temperature in order to obtain a significant improvement in power conversion efficiency (PCE) from 16.73% to 23.18%. The results highlight the importance of absorber thickness (optimized at 700 nm) and defect minimization in enhancing light absorption and carrier transport. These findings underscore the potential of Cs₂AgBiBr 6 double perovskites as a viable alternative to lead-based PSCs, paving the way for environmentally sustainable and efficient photovoltaic devices.