Theoretical Modeling of Perovskite–Kesterite Tandem Solar Cells for Optimal Photovoltaic Performance

• Published in: Energy technology (Weinheim, Germany) Vol. 10; no. 12
• Main Author: Deepthi, Jayan K
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 01-12-2022
• Subjects: Circuit design; Circuits; computational modeling; Copper zinc tin selenide; Current density; Energy conversion efficiency; input parameter optimizations; kesterite materials; Mathematical models; Modelling; Optimization; Parameters; Performance assessment; Perovskites; Photovoltaic cells; Photovoltaics; Solar cells; tandem solar cells
• ISSN: 2194-4288; 2194-4296
• DOI: 10.1002/ente.202200635

Herein, a solar cell device simulation study is performed using the solar cell capacitance simulator 1D tool to assess the performance parameters of a monolithic two‐terminal (2‐T) and a mechanically stacked four‐terminal (4‐T) tandem solar cell with a top perovskite subcell and a bottom subcell consisting of a perovskite material FA0.83Cs0.17PbI1.5Br1.5 and a kesterite photovoltaic material Cu2ZnSnSe4 as the light‐harvesting material, respectively. The 2‐T tandem device design furnishes a open‐circuit voltage, short‐circuit current density, fill factor, and power conversion efficiency (PCE) of 1.81 V, 18.18 mA cm−2, 66.18%, and 31.15%, respectively, while establishing the condition of matching the short‐circuit current density between the top perovskite and bottom kesterite cells. The 4‐T device furnishes a high PCE of 37.49% when the filtered spectrum is used for modeling the bottom subcell. Further, the optimization of the input parameters of the light active layers of the top and bottom cells leads to an increase in PCE of the 4‐T tandem device to 37.84%.
This study reports a power conversion efficiency of 31.15% and 37.84%, respectively, for a monolithic two‐terminal (2‐T) and a mechanically stacked four‐terminal (4‐T) tandem solar cell consisting of a top FA0.83Cs0.17PbI1.5Br1.5 perovskite subcell and a bottom Cu2ZnSnSe4 kesterite subcell after device optimization using 1D tool.