Surface Engineering-Induced 2D/3D Interfacial Reconstruction for Stable Low-Light Perovskite Solar Cells

Area of Science:

• Materials Science
• Renewable Energy
• Photovoltaics

Background:

• Interfacial defects and ion migration are key limitations in perovskite solar cells (PSCs), reducing efficiency and operational stability, especially under low-light conditions.
• Interfacial recombination significantly impacts PSC performance, particularly in environments with reduced light intensity.

Purpose of the Study:

• To introduce a post-surface treatment using dibutylammonium bromide (DBABr) to engineer the interface of PSCs.
• To improve the efficiency, low-light performance, and operational stability of perovskite solar cells through controlled interfacial reconstruction.

Main Methods:

• A secondary amine, dibutylammonium bromide (DBABr), was used for post-surface treatment of perovskite solar cells.
• Controlled 2D/3D interfacial reconstruction was achieved, forming a quasi-two-dimensional perovskite layer on a 3D absorber.
• The treated interfaces were characterized for defect passivation, ion migration suppression, and energy-level alignment.

Main Results:

• DBABr treatment enhanced power conversion efficiency (PCE) from 13.82% to 15.52% under standard one-sun illumination.
• Devices showed improved indoor energy harvesting, with PCEs of 30.57% (0.09 cm²) and 27.77% (1 cm²) under 1000 lx LED illumination.
• Treated PSCs retained approximately 90% of their initial efficiency after 1000 hours of operation under ambient conditions.

Conclusions:

• Interfacial dimensional reconstruction using secondary-amine surface engineering is an effective strategy for PSCs.
• This method simultaneously enhances efficiency, low-light performance, and operational durability in carbon-based PSCs.
• The findings contribute to advancing sustainable photovoltaic technologies, aligning with Sustainable Development Goal 7.