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Multifunctional Buried Molecule-Bridge for High-Performance Inverted Perovskite Solar Cells
Mingyang Gao1, Zeping Ou1, Can Wang1
1MOE Key Laboratory of Low-grade Energy Utilization Technologies and Systems, School of Energy & Power Engineering, Chongqing University, Chongqing, 400044, China.
Advanced Materials (Deerfield Beach, Fla.)
|September 17, 2025
Summary
A novel molecular bridge, 4-Bromobenzylphosphnic acid (4Br-BPA), enhances perovskite solar cells by improving interfacial contact and reducing energy loss. This boosts power conversion efficiency (PCE) and operational stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Carbazole-based self-assembled monolayers (SAMs) are crucial for hole transport in perovskite solar cells (PSCs).
- Interfacial energy losses occur due to inhomogeneous SAM distribution and poor contact in PSCs.
- Optimizing the interface is key to enhancing PSC performance.
Purpose of the Study:
- To develop a molecular bridge to improve interfacial characteristics in inverted PSCs.
- To enhance the power conversion efficiency (PCE) and operational stability of PSCs.
- To investigate the multifunctional role of 4-Bromobenzylphosphnic acid (4Br-BPA) at the NiOx/Me-4PACz/perovskite interface.
Main Methods:
- Synthesis and application of 4-Bromobenzylphosphnic acid (4Br-BPA) as a molecular bridge.
- Utilizing phosphonic acid groups for void filling and surface state amelioration.
- Employing π-π stacking interactions for charge suppression and energy level alignment.
- Investigating the passivation of interfacial traps and improvement of perovskite film crystallization.
Main Results:
- Achieved a power conversion efficiency (PCE) of 26.59% (certified 26.12%) in inverted PSCs.
- Demonstrated significantly improved operational stability, retaining 90% efficiency after 1400 hours of illumination.
- 4Br-BPA effectively filled voids, suppressed charge accumulation, aligned energy levels, passivated traps, and enhanced perovskite crystallization.
Conclusions:
- The molecular bridge 4Br-BPA effectively optimizes the SAM/perovskite interface in PSCs.
- This optimization leads to substantial improvements in both power conversion efficiency and device stability.
- 4Br-BPA presents a promising strategy for advancing PSC technology.
