Progress and Challenges of Three-Dimensional/Two-Dimensional Bilayered Perovskite Solar Cells: A Critical Review

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Bilayered perovskite solar cells, specifically 3D/2D structures, are gaining traction for improved efficiency and stability.
• These cells are typically configured as regular (n-i-p)-type devices.

Purpose of the Study:

• This review focuses on the role of the 2D perovskite capping layer in 3D/2D bilayered perovskite solar cells.
• It investigates various organic precursors used as capping layers and their effects on device performance.

Main Methods:

• The review analyzes the function of the 2D capping layer in defect healing, interface modification, and environmental shielding.
• It examines how the 2D layer mitigates ion migration.

Main Results:

• The 2D capping layer effectively heals surface and bulk defects in the 3D perovskite thin film.
• It serves as a crucial interface between the 3D perovskite and hole transport layers.
• The 2D layer provides protection against moisture and heat, and inhibits ion migration.

Conclusions:

• The strategic use of 2D perovskite capping layers is vital for enhancing the efficiency and long-term stability of 3D/2D perovskite solar cells.
• Understanding the impact of different organic precursors and addressing challenges in layer deposition are key for further advancements.