High-performance bifacial perovskite solar cells enabled by single-walled carbon nanotubes

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Bifacial perovskite solar cells (PSCs) offer increased power by absorbing light from both sides.
• Current PSCs face challenges with opaque back electrodes and complex front electrode fabrication.
• Suboptimal optical transmittance and intricate manufacturing hinder bifacial PSC efficiency.

Purpose of the Study:

• To develop efficient bifacial perovskite devices using novel electrode materials.
• To overcome limitations of conventional transparent conducting oxides and metal electrodes.
• To explore the potential of single-walled carbon nanotubes (SWCNTs) in bifacial PSCs.

Main Methods:

• Utilized single-walled carbon nanotubes (SWCNTs) as both front and back electrodes in perovskite solar cells.
• Fabricated flexible, all-carbon-electrode-based bifacial PSCs.
• Evaluated device performance, including bifaciality factor, power generation density, and mechanical durability.

Main Results:

• Achieved a bifaciality factor exceeding 98% and power generation density over 36%.
• Developed flexible devices with a high power-per-weight ratio (73.75 W/g) and robust mechanical stability.
• Demonstrated significantly lower material costs compared to conventional monofacial PSCs.

Conclusions:

• SWCNT electrodes are a promising solution for efficient, stable, and cost-effective bifacial perovskite photovoltaics.
• The all-carbon electrode approach facilitates the development of high-performance, flexible solar cells.
• This technology has the potential to reduce the cost and improve the performance of perovskite solar energy.