Performance analyses of highly efficient inverted all-perovskite bilayer solar cell

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Physics

Background:

• Perovskite solar cells offer high efficiency but often suffer from limited spectral absorption.
• Bilayer structures can potentially overcome single-junction limitations by broadening the absorption spectrum.

Purpose of the Study:

• To numerically simulate and optimize an all-perovskite bilayer solar cell for enhanced performance.
• To investigate the impact of absorber layer thickness, contact work function, and temperature on device efficiency.

Main Methods:

• Numerical simulations using SCAPS-1D software.
• Validation of standalone inverted solar cell models against state-of-the-art results.
• Optimization of a bilayer structure with MAPbI3 (1.55 eV) and FA0.5MA0.5Pb0.5Sn0.5I3 (1.25 eV) absorbers.

Main Results:

• The bilayer structure effectively broadens absorption into the near-infrared region.
• Device performance is significantly influenced by the thickness of the FA0.5MA0.5Pb0.5Sn0.5I3 layer and front contact work function (> 5 eV).
• An optimized cell achieved 24.83% power conversion efficiency, 79.4% fill factor, 0.9 V open-circuit voltage, and 34.76 mA/cm2 short-circuit current density at 275 K.

Conclusions:

• All-perovskite bilayer solar cells are a promising avenue for efficient photovoltaic devices.
• Careful selection of absorber materials and optimization of device parameters are crucial for maximizing performance.
• The proposed design demonstrates potential for high-efficiency solar energy conversion.