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Symmetrical Oxalate Derivative for Dual Interface-Grain Boundary Chelation Enabling High-Efficiency and Stable
Yiheng Gao1, Yongqi Ma1, Bobo Yuan1
1Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan, Hubei 430205, P. R. China.
ACS Applied Materials & Interfaces
|December 29, 2025
Summary
A new molecule, bis(2,4,5-trichloro-6-carbopentoxyphenyl) oxalate (BTCPPO), enhances perovskite solar cell stability and efficiency by passivating defects and improving surface properties. This leads to higher performance and longevity for perovskite solar cells.
Area of Science:
- Materials Science
- Photovoltaics
- Chemical Engineering
Background:
- Perovskite solar cells (PSCs) face challenges from high surface defect densities, leading to recombination and instability.
- Interfacial engineering is crucial for improving PSC performance and operational lifetime.
Purpose of the Study:
- To introduce a novel oxalate derivative, BTCPPO, for passivating defects at the perovskite/hole transport layer interface.
- To enhance the stability and efficiency of PSCs through interfacial modification.
Main Methods:
- Synthesized and applied BTCPPO at the perovskite/HTL interface.
- Investigated BTCPPO's effects on perovskite crystallinity, defect passivation, and surface properties.
- Fabricated and tested PSC devices incorporating BTCPPO.
Main Results:
- BTCPPO reduced grain boundary defects and enhanced perovskite crystallinity via local recrystallization.
- Passivation of interfacial defects and grain boundaries prolonged charge-carrier lifetimes and suppressed nonradiative recombination.
- BTCPPO created a superhydrophobic surface, improving moisture resistance and optimizing hole extraction.
- PSCs achieved a champion efficiency of 25.62% with negligible hysteresis.
- Devices retained ~90% of initial efficiency after 3800 hours under ambient conditions, demonstrating excellent stability.
Conclusions:
- BTCPPO effectively passivates defects and enhances stability in PSCs.
- The developed interfacial strategy offers a promising route for high-performance and durable perovskite solar cells.
