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Achieving Defect Passivation and Oriented Crystallization Regulation at the SnO2/Perovskite Interface via Molecular
Tong Tang1, Bo Yu1, Yuning Zhang1
1School of Physics and Optoelectronics, South China University of Technology, Guangzhou, Guangdong, 510640, China.
Small (Weinheim an Der Bergstrasse, Germany)
|October 3, 2025
Summary
Introducing 3-Isothioureidopropionic acid (ATPN) as a molecular bridge significantly enhances perovskite solar cell performance by passivating interface defects. This leads to improved efficiency and long-term stability in SnO2-based devices.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Interface defects in SnO2/perovskite layers limit perovskite solar cell (PSC) efficiency, hysteresis, and stability.
- Effective passivation strategies are crucial for advancing PSC technology.
Purpose of the Study:
- To introduce 3-Isothioureidopropionic acid (ATPN) as a molecular bridge to passivate buried interface defects in SnO2-based PSCs.
- To investigate the impact of ATPN on perovskite crystal growth, charge transport, and device performance.
Main Methods:
- Utilized ATPN as a molecular bridge at the SnO2/perovskite interface.
- Investigated defect passivation via -COOH, -C═NH, and -NH2 groups.
- Performed in situ crystallization studies to analyze perovskite growth.
- Fabricated and characterized PSCs with and without ATPN treatment.
Main Results:
- ATPN effectively passivated SnO2 surface defects and undercoordinated ions in perovskite.
- ATPN promoted larger perovskite grains and a preferred (100) crystal orientation.
- ATPN-treated PSCs achieved a champion power conversion efficiency (PCE) of 24.06% (vs. 22.15% for control).
- ATPN-modified devices retained 90.14% of initial PCE after 1920h aging (vs. 68.32% for control).
Conclusions:
- ATPN serves as an effective molecular bridge for defect passivation and oriented perovskite growth.
- ATPN significantly enhances the efficiency, stability, and reduces hysteresis in SnO2-based PSCs.
- This strategy offers a promising pathway for developing high-performance and stable perovskite solar cells.
Keywords:
defect passivationinterfacial molecular bridgeoriented crystallization regulationperovskite solar cellsMore Related Videos
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