High-Efficiency and UV-Stable Planar Perovskite Solar Cells Using a Low-Temperature, Solution-Processed...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Traditional perovskite solar cells (PSCs) utilize high-temperature TiO2 ETLs, leading to recombination and UV instability.
• This limits the efficiency and operational lifetime of PSCs.

Purpose of the Study:

• To develop low-temperature solution-processed ETLs for efficient and UV-stable planar PSCs.
• To investigate the impact of Li-TFSI doping on C60 ETLs in n-i-p PSCs.

Main Methods:

• Fabrication of planar PSCs using Li-TFSI doped C60 (Li-C60) as ETLs.
• Characterization of ETL properties, including energy matching and electron mobility.
• Performance testing of PSCs under simulated sunlight and UV exposure.

Main Results:

• Li-C60 ETLs improved energy alignment between the active layer and cathode.
• Electron mobility in the ETL was significantly enhanced.
• Power conversion efficiency (PCE) increased from 15.3% to 17.8% with reduced hysteresis.
• PSCs with Li-C60 ETLs exhibited superior UV stability and long-term operational stability.

Conclusions:

• Li-TFSI doping of C60 offers a promising low-temperature processing route for high-performance and stable PSCs.
• This approach addresses key limitations of traditional TiO2 ETLs, paving the way for more durable perovskite solar technology.