Synergistic Modulation of Sn-Based Perovskite Solar Cells with Crystallization and Interface Engineering

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• High-performance perovskite solar cells require quality absorber layers and efficient charge transport.
• Controlling tin (Sn2+) oxidation and promoting rapid crystallization are crucial for high-quality tin-based perovskite films.
• Interface engineering is vital for optimizing carrier extraction and transport.

Purpose of the Study:

• To improve the quality and performance of tin-based perovskite solar cells.
• To suppress Sn2+ oxidation and enhance crystallization using tin fluoride (SnF2).
• To boost carrier extraction and transport via interface modification of the hole-transporting layer.

Main Methods:

• Incorporation of tin fluoride (SnF2) into the perovskite precursor solution to control crystallization and morphology.
• Modification of the PEDOT:PSS hole-transporting layer with cesium iodide (CsI).
• Fabrication and characterization of inverted tin-based perovskite solar cells.

Main Results:

• Tin fluoride (SnF2) effectively modulated the crystallization and morphology of the tin-based perovskite layer.
• Cesium iodide (CsI) modification enhanced hole extraction and transport in the PEDOT:PSS layer.
• The fabricated inverted solar cells achieved a power conversion efficiency of 7.53% with improved stability.

Conclusions:

• The combined strategy of SnF2 incorporation and CsI interface modification significantly enhances tin-based perovskite solar cell performance.
• This approach offers a viable pathway for developing stable and efficient tin-based perovskite solar cells.
• The study highlights the importance of precursor engineering and interface modification for advanced photovoltaic devices.