Heat generation in perovskite/CZTSSe tandem solar cells

Tandem of Perovskite and other materials for solar cell structure have attracted the attention of many researchers. Here, we developed a strong coupled model to investigate the heat generation and thermal stability of Perovskite/CZTSSe Tandem Solar Cells. Studying the opto-electro-thermal (OET) properties of tandem solar cells is essential to better understand the optical absorption, carrier transport, and their thermodynamic behavior. In recent years, thermal losses in solar cells have received more attention and heat generation in solar cell structure has said to be effective on long-term stability and performance. Temperature distribution and heat generation of tandem solar cells has been rarely investigated in literature. The heat generation through Peltier heat, Thermalization heat, Joule heat, Non-radiative recombination heat and Surface recombination heat has been mapped using COMSOL. CZTSSe bottom cell generates more Joule heat (H_Joule = 224.65 W/m²) compared to Perovskite top cell (H_Joule = 78.3 W/m²). H_{Thermalization} = 166.34 W/m² and H_peltier = 136 W/m² are also higher in CZTSSe bottom cell compared to lower value in perovskite top cell (H_{Thermalization} = 58.73 W/m², H_peltier = 111.78 W/m²). Non-radiative recombination heat is negligible in Perovskite top cell compared to CZTSSe bottom cell (H_non-rad = 4.41 W/m²).