Approaching 24% Efficiency in Four-Terminal Perovskite/CZTSSe Tandem Solar Cells Using Diphenylammonium Chloride...

Area of Science:

• Materials Science
• Renewable Energy

Background:

• Tandem solar cells combining perovskite and CZTSSe offer high photovoltaic efficiency.
• Wide-bandgap (WBG) perovskite solar cells (PSCs) are crucial components for these devices.

Purpose of the Study:

• To investigate the effect of diphenylammonium chloride (DPACl) additive on WBG PSCs.
• To enhance the performance of four-terminal (4-T) hybrid tandem solar cells (HTSCs) by integrating optimized WBG PSCs with CZTSSe bottom cells.

Main Methods:

• Systematic optimization of DPACl additive concentration in WBG PSCs.
• Fabrication and characterization of DPACl-modified WBG PSCs.
• Integration of optimized WBG PSCs with narrow-bandgap (NBG) CZTSSe solar cells into a 4-T HTSC device.

Main Results:

• Optimized DPACl additive improved perovskite film quality and charge carrier dynamics, reducing non-radiative recombination.
• A DPACl-based PSC achieved a power conversion efficiency (PCE) of 19.66% and an open-circuit voltage (V_OC) of 1.172 V.
• The resulting 4-T HTSC device, combining WBG PSCs and NBG-CZTSSe, demonstrated a high PCE of 23.96%.

Conclusions:

• DPACl is an effective additive for enhancing WBG PSC performance.
• The developed perovskite/CZTSSe tandem architecture shows significant potential for high-efficiency photovoltaics.