Piezo-phototronic Effect Enhanced Efficient Flexible Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) have shown remarkable progress in power conversion efficiency (PCE), exceeding 23%.
• Further PCE enhancement in PSCs faces challenges related to material properties, device stability, and packaging.
• Flexible PSCs offer potential for diverse applications but require efficient performance optimization.

Purpose of the Study:

• To introduce a novel method for increasing the PCE of flexible PSCs.
• To investigate the application of the piezo-phototronic effect for performance enhancement.
• To demonstrate a generalizable strategy for improving flexible PSCs without material modification.

Main Methods:

• Growing zinc oxide (ZnO) nanowires on flexible plastic substrates to serve as the electron-transport layer.
• Integrating ZnO nanowires into the flexible PSC structure to leverage the piezo-phototronic effect.
• Applying static mechanical strain to the fabricated flexible PSCs to measure performance changes.

Main Results:

• The piezo-phototronic effect was successfully introduced into flexible PSCs using ZnO nanowires.
• Power conversion efficiency (PCE) of flexible PSCs improved from 9.3% to 12.8% under 1.88% static mechanical strain.
• A significant enhancement of approximately 40% in PCE was achieved without altering the fundamental materials or device architecture.

Conclusions:

• The piezo-phototronic effect offers a viable strategy to enhance the PCE of flexible PSCs.
• ZnO nanowires can effectively function as an electron-transport layer, enabling the piezo-phototronic effect in flexible PSCs.
• This approach provides a generalizable method for boosting flexible PSC performance without compromising material integrity.