Diffusible Capping Layer Enabled Homogeneous Crystallization and Component Distribution of Hybrid Sequential...

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Wide-bandgap perovskite development is crucial for textured perovskite/silicon tandem solar cells.
• Hybrid sequential deposition (HSD) faces challenges with perovskite capping layers hindering reactions.
• Dense, highly crystalline evaporated precursors in HSD exacerbate insufficient reaction issues.

Purpose of the Study:

• To introduce a facile "diffusible perovskite capping layer" (DPCL) strategy.
• To overcome the limitations of common perovskite capping layers in HSD.
• To enhance the performance and stability of textured perovskite/silicon tandem solar cells.

Main Methods:

• Development of a "diffusible perovskite capping layer" (DPCL).
• Application of DPCL in hybrid sequential deposition (HSD) for perovskite film formation.
• Characterization of perovskite film properties and device performance.

Main Results:

• DPCL strategy alleviates perovskite crystallization and enhances organic salt diffusion.
• Achieved a homogenization process in perovskite films.
• Resultant films showed complete conversion, uniform crystallization, enhanced quality, and reduced defects.
• Demonstrated improvements in device efficiency, repeatability, and stability.

Conclusions:

• The DPCL strategy effectively addresses challenges in HSD for perovskite solar cells.
• DPCL leads to superior perovskite film quality and improved device performance.
• This work provides a pathway for advancing textured perovskite/silicon tandem solar cell technology.