Polyfluorinated-Regulator-Assisted Scaffold-Directed Tilted 1D/3D Heterointerfaces for High-Voltage and Stable...

Area of Science:

• Materials Science
• Renewable Energy
• Nanotechnology

Background:

• Perovskite solar cells (PSCs) face stability challenges due to interfacial issues.
• Low-dimensional interphases can improve stability but often hinder charge extraction.

Purpose of the Study:

• To develop a new strategy for constructing robust and efficient interphases in inverted PSCs.
• To enhance both the stability and performance of perovskite solar cells.

Main Methods:

• A scaffold-directed strategy was employed to create an interwoven tilted 1D/3D heterointerface on perovskite absorbers.
• PbI2 was deposited onto a tilt-oriented 3D perovskite scaffold, followed by solvent-assisted reconstruction.
• 7F-EA-HI was used as a crystallization regulator to minimize defects and optimize interfacial energetics.

Main Results:

• A compact, tilted 1D interphase of PbI2 and δ-FAPbI3 was successfully formed, preserving out-of-plane connectivity.
• The tilted interphase acted as a barrier against defect propagation and ion migration.
• Optimized inverted PSCs achieved a power conversion efficiency (PCE) of 24.94% with improved V_OC, J_SC, and FF.
• Enhanced ambient and thermal stability was observed in the fabricated devices.

Conclusions:

• Tilted 1D/3D interfacial engineering is a promising approach for high-voltage and durable perovskite optoelectronics.
• The developed strategy effectively balances stability and charge extraction in PSCs.
• This work paves the way for more stable and efficient perovskite solar cell technologies.