Efficiency enhancement of a tandem Perovskite-Silicon solar cell

A tandem solar cell consisting of three cells is designed and simulated by the Solar Cell Capacitor Simulator (SCAPS) program. The bandgap of the top cell absorber (Cs۲AgBi۰.۷۵Sb۰.۲۵Br۶) is ۱.۸ eV, the middle cell absorber (CH۳NH۳PbI۳) has a bandgap of ۱.۵۵ eV), and a single-crystal silicon cell (with ۱.۱۲ eV bandgap) is selected as the bottom cell. Each of these cells were simulated and optimized separately. To improve current density in the middle cell, CuSCN is chosen as the holetransport layer (HTL). Power conversion efficiencies (PCE) of individual Cs۲AgBi۰.۷۵Sb۰.۲۵Br۶, MAPbI۳, and Si cells are ۱۴.۳۲%, ۲۵.۰۹%, and ۲۵.۲۲%, respectively. which are quite close to the results published in the literature. Consequently, the tandem structure of these cells is simulated and the optimal thicknesses for the absorber layers (as required by the current-matching condition) in a two-terminal (۲T) monolithic structure is calculated. The optimized thicknesses of Cs۲AgBi۰.۷۵Sb۰.۲۵Br۶ and MAPbI۳ absorber layers in the tandem configuration are ۳۰۰ and ۵۵۰ nm, respectively. The transmitted spectra of the top and middle cells are obtained using the Matlab software. Subsequently, the SCAPS numerical simulation for the ۲T tandem structure gave an enhanced power conversion efficiency (PCEs) of ۳۸.۹%.

کلیدواژه ها:

Photovoltaic solar cells ، Tandem structure ، Perovskite solar cells ، Power conversion efficiency enhancement