Multi-Hydroxyl and Chloric Buried Interface Bridges Enable Synergistically High-Efficiency Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Interface defects in perovskite solar cells are a major cause of non-radiative recombination, hindering carrier extraction and transport.
• These interface defects are significantly more prevalent than bulk defects, impacting overall device performance.

Purpose of the Study:

• To introduce a passivation strategy for interface defects in perovskite solar cells.
• To improve the efficiency and stability of perovskite solar cells by addressing interface issues.

Main Methods:

• Incorporation of green pyridoxine hydrochloride (PDHC) into tin oxide (SnO2) quantum dots (QDs) solution.
• Surface chloritization of SnO2 QDs to passivate interface defects and form a stable interlayer.
• Heterogeneous nucleation of perovskite films on precursor films for defect suppression.

Main Results:

• PDHC treatment led to surface chloritization of SnO2 QDs, strengthening inter-QD contact and forming a stable perovskite/SnO2 interlayer.
• Efficient electron transport bridges were established at buried interfaces, improving electron extraction.
• Perovskite films with suppressed bulk defects and extended carrier lifetime were achieved.
• Perovskite solar cell efficiency increased from 24.18% to 25.07%.
• Unencapsulated devices retained ~90% efficiency after 2520 h storage, showing significant improvements in thermal and light stability.

Conclusions:

• The PDHC-based passivation strategy effectively addresses interface defects in perovskite solar cells.
• This approach significantly enhances both the power conversion efficiency and long-term operational stability of perovskite devices.
• The developed method offers a promising route for fabricating high-performance and durable perovskite solar cells.