High-performance hematite-integrated perovskite solar cells

Area of Science:

• Materials Science
• Renewable Energy
• Solid-State Physics

Background:

• Perovskite solar cells (PSCs) are a promising photovoltaic technology.
• Efficient electron transport layers (ETLs) are crucial for PSC performance and stability.
• Hematite (α-Fe2O3) offers potential as a stable and cost-effective ETL material.

Purpose of the Study:

• To investigate the use of thermodynamically stable hematite (α-Fe2O3) as an ETL in PSCs.
• To optimize PSC performance by tuning the α-Fe2O3 layer and perovskite parameters.
• To evaluate the thermal stability and efficiency of the developed PSCs.

Main Methods:

• Fabrication of PSCs utilizing an α-Fe2O3 ETL.
• Optimization of α-Fe2O3 layer thickness and perovskite properties.
• Performance characterization using solar cell capacitance simulator (SCAPS-1D) under AM 1.5G illumination.

Main Results:

• Predicted power conversion efficiency (PCE) of 25.62% with optimized parameters.
• Achieved high short-circuit current (JSC) of 23.58 mA cm⁻², open-circuit voltage (VOC) of 1.286 V, and fill factor (FF) of 84.39%.
• Demonstrated high thermal stability at 85 °C and improved charge extraction with optimized defect density and doping.

Conclusions:

• Hematite (α-Fe2O3) is a viable and high-performing ETL for PSCs.
• Optimized α-Fe2O3 thickness (10 nm) and perovskite thickness (800 nm) enhance efficiency.
• Reduced defect density and controlled doping are key to improving PSC performance and stability.