Breaking the Efficiency-Transparency Compromise in Semitransparent Solar Cells by Optimizing the Perovskite/C₆₀...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Semitransparent perovskite solar cells (ST-PSCs) are crucial for tandem applications and building-integrated photovoltaics.
• Significant open-circuit voltage (V_OC) loss due to interfacial nonradiative recombination hinders ST-PSC development.

Purpose of the Study:

• To address V_OC loss in ST-PSCs by employing surface molecular engineering.
• To passivate interfacial defects and optimize energy-level alignment at the perovskite/C60 interface.

Main Methods:

• Utilized tyramine hydrochloride (TACl) for surface molecular engineering at the perovskite/C60 interface.
• Investigated the role of organic ammonium and chloride ions in defect passivation and halide vacancy compensation.
• Fabricated and characterized TACl-modified ST-PSCs.

Main Results:

• TACl treatment passivated Pb-related defects and compensated halide vacancies, suppressing nonradiative recombination.
• Achieved a wide-bandgap perovskite film with enhanced crystallinity and reduced defect density.
• Developed a semitransparent device with 14.66% power conversion efficiency (PCE) and 13.2% average visible light transmittance.
• Demonstrated significantly improved operational stability, retaining 82% of initial PCE after 720 hours in air.

Conclusions:

• Surface molecular engineering with TACl is a viable strategy for high-performance ST-PSCs.
• The method effectively reduces interfacial defects and enhances energy-level alignment.
• TACl-modified ST-PSCs exhibit superior efficiency and stability compared to control devices.