Single-Crystal Nanowire Cesium Tin Triiodide Perovskite Solar Cell

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells show promise for flexible photovoltaics.
• Cesium tin triiodide (CsSnI₃) is an emerging material for all-inorganic solar cells.
• Improving crystallinity and device structure is key to enhancing perovskite solar cell performance.

Purpose of the Study:

• To report the first highly efficient single-crystal CsSnI₃ perovskite nanowire solar cell.
• To investigate the potential of CsSnI₃ nanowires for powering micro-scale electronic devices.
• To demonstrate a viable pathway for high-performance, tin-based perovskite solar cells.

Main Methods:

• Fabrication of single-crystal CsSnI₃ perovskite nanowires.
• Characterization of nanowire properties including lattice structure, carrier trap density, carrier lifetime, and mobility.
• Integration of CsSnI₃ nanowires with wide bandgap semiconductor front-surface-field layers.
• Performance testing of the solar cell under AM 1.5G illumination.

Main Results:

• Achieved a perfect lattice structure and low carrier trap density (≈5 × 10¹⁰ cm^-3).
• Observed long carrier lifetime (46.7 ns) and excellent carrier mobility (>600 cm² V^-1 s^-1).
• Attained an unprecedented solar cell efficiency of 11.7%.

Conclusions:

• Single-crystal CsSnI₃ perovskite nanowires are highly suitable for flexible photovoltaics.
• Crystallinity and device structure improvements enable high-performance all-inorganic tin-based perovskite solar cells.
• This technology paves the way for future energy supply to flexible wearable devices.