Researchers from India's Madanapalle Institute of Technology & Science have reported an innovative dual-absorber solar cell design using Dicesium Silver Indium Hexabromide (Cs2AgInBr6) and Cesium Tin Tri-iodide (CsSnI3) in a FTO/ZnO/Cs2AgInBr6/CsSnI3/CFTS heterojunction architecture.
The optimal energy band alignment, along with structural and electrical parameter optimization of the Cs2AgInBr6/CsSnI3 dual-absorber configuration, enhances power conversion efficiency (PCE), overcoming limitations in single-absorber Cs2AgInBr6 perovskite photovoltaic cells (PPCs). This enhancement is due to the synergistic effects between absorbers, improving light absorption and charge carrier dynamics.
Using SCAPS-1D, critical parameters such as absorber thickness, defect density, and carrier transport layers were optimized.
The dual-absorber achieved a PCE of 25.32 %, Voc of 0.95 V, fill factor of 86 %, and Jsc of 31.9 mA/cm2, outperforming the 11.96 % PCE of single-absorber PPCs.
A peak quantum efficiency (QE) of 90 % spanning over 300–1000 nm wavelength range was also obtained, surpassing the 79 % QE of single absorbers over 300–830 nm.
