Interface engineering for high-performance, triple-halide perovskite-silicon tandem solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Two-terminal monolithic perovskite-silicon tandem solar cells offer high potential for efficient solar energy conversion.
• Reducing recombination losses is crucial for improving the stability and efficiency of these devices.

Purpose of the Study:

• To enhance the performance of perovskite-silicon tandem solar cells by minimizing recombination losses.
• To improve band alignment and charge extraction at the electron-selective contact.

Main Methods:

• Fabrication of monolithic perovskite-silicon tandem solar cells.
• Utilized a triple-halide perovskite with a 1.68 eV bandgap.
• Incorporated piperazinium iodide as an interfacial modification layer.

Main Results:

• Achieved improved band alignment and reduced nonradiative recombination losses.
• Enhanced charge extraction at the electron-selective contact.
• Demonstrated open-circuit voltages of 1.28 V for single junctions and 2.00 V for tandem cells.
• Attained certified power conversion efficiencies of up to 32.5% for tandem cells.

Conclusions:

• Piperazinium iodide interfacial modification effectively reduces recombination losses in perovskite-silicon tandem solar cells.
• The developed cells show significant advancements in voltage and efficiency, paving the way for next-generation photovoltaics.