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A Tricyclic Fused-Ring Molecular Design for Multifunctional Defect Passivation in High-Performance Perovskite
Tao Wang1, Xinlong Zhao1, Kunpeng Li1
1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|November 3, 2025
Summary
Researchers developed a new molecule to improve perovskite solar cells by reducing defects. This enhances efficiency and stability, achieving a 25.30% power conversion efficiency (PCE) and improved device longevity.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- High-density defects in perovskite films hinder photovoltaic efficiency and stability.
- Perovskite solar cells require advanced materials for improved performance.
Purpose of the Study:
- To design a novel small molecule for passivating defects in perovskite films.
- To enhance the efficiency, stability, and charge transport properties of perovskite solar cells.
Main Methods:
- A multifunctional near-infrared small molecule (Tbzf) with a tricyclic electron-deficient core was synthesized.
- Tbzf was used as an antisolvent additive to control crystallization and passivate interfacial defects.
- Perovskite solar cells and photovoltaic photodetectors were fabricated and characterized.
Main Results:
- Tbzf treatment led to high-quality perovskite films with improved charge transport.
- Perovskite solar cells achieved a champion power conversion efficiency (PCE) of 25.30%.
- Devices showed enhanced moisture resistance, retaining over 80% PCE after 3000h illumination; photodetectors exhibited ultra-low dark current and fast response.
Conclusions:
- The designed molecule effectively passivates defects and improves perovskite film quality.
- This strategy significantly advances perovskite solar cell performance and operational stability.
- The approach is promising for high-performance perovskite applications in photovoltaics and photodetection.
