Enhancing the structural, and optoelectronic properties of double ETL Nickel doped CsPbIBr2 perovskite solar cell

Abstract

The structural, optoelectronic, and photovoltaic properties of CsPbIBr2 perovskite films were significantly enhanced by incorporating 4% Ni doping and utilizing a bilayer electron transport layer (ETL) consisting of titanium dioxide (TiO2) and nickel-doped tungsten trioxide (Ni-WO3). X-ray diffraction (XRD) analysis of perovskite film revealed an increase in crystal size from 29.9 nm to 55.2 nm and a decrease in lattice constant from 6.024 Å to 6.012 Å upon Ni doping, indicating improved crystallinity. The energy band gap of pure and Ni-CsPbIBr2 decreased from 2.0 eV to 1.94 eV respectively, enhancing light absorption efficiency. The refractive index increased of pure and Ni-CsPbIBr2 from 2.625 to 2.645 respectively, enhancing light trapping and absorption. J-V measurements showed an efficiency increase from 12.26% to 12.96% with the introduction of double ETL, demonstrating significant advancements in perovskite solar cell performance.