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Dual-Functional Top-Interface Passivation Using a Thiohydantoin Derivative for High-Performance Perovskite Solar
Qi Hu1,2, Xiao Wu3, Leying Zha2
1School of Science, Yanshan University, Qinhuangdao, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 13, 2025
Summary
Researchers developed a new passivation strategy using 3-Phenyl-2-Thiohydantoin-5-Propionic Acid (PTGA) to improve perovskite solar cells (PSCs). This method enhances efficiency and stability by reducing recombination losses at the perovskite/electron transport layer interface.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) face efficiency and stability limitations due to nonradiative recombination at interfaces.
- The perovskite (PVK)/electron transport layer (ETL) interface is a critical area for performance degradation.
Purpose of the Study:
- To introduce a novel passivation strategy for the PVK/ETL interface in inverted PSCs.
- To investigate the mechanism of molecular passivation for enhancing PSC performance and stability.
Main Methods:
- Employing 3-Phenyl-2-Thiohydantoin-5-Propionic Acid (PTGA) as a multifunctional interlayer at the PVK/ETL interface.
- Utilizing PTGA's amine and carboxylic acid groups to repair anionic defects and passivate undercoordinated Pb2+ cations.
- Analyzing the impact of PTGA on crystallinity, energy band alignment, electron extraction, and recombination.
Main Results:
- PTGA effectively reduces interfacial defect concentration through cooperative multisite passivation.
- The passivation strategy improves active layer crystallinity and optimizes energy band alignment.
- Treated inverted PSCs achieved a champion efficiency of 25.13% with enhanced long-term storage and illumination stability.
Conclusions:
- Multisite molecular passivation with PTGA offers a simple yet effective strategy to boost PSC performance.
- The study provides a profound mechanistic understanding of interfacial defect passivation in perovskite photovoltaics.
- This approach holds significant potential for advancing the commercial viability of perovskite solar cells.
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