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A Universal P-Type Heterointerface for Inverted Perovskite Solar Cells
Biyun Ren1, Tengfei Pan1, Zihan Gu1
1State Key Laboratory of Flexible Electronics (LoFE) & Institute of Advanced Materials (IAM), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing, Jiangsu, 211816, P.R. China.
Angewandte Chemie (International Ed. in English)
|May 21, 2025
Summary
Researchers developed a new method using imidazole hydroiodide (ImHI) to improve hole extraction in perovskite solar cells. This enhances efficiency and stability for advanced solar energy applications.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Inverted perovskite solar cells (PSCs) offer high efficiency and stability.
- Hole extraction at the SAMs/perovskite interface is a key limitation.
- Self-assembled monolayers (SAMs) are crucial for PSC performance.
Purpose of the Study:
- To enhance hole extraction efficiency at the SAMs/perovskite interface.
- To improve the overall performance and stability of inverted PSCs.
- To introduce a universal p-type heterointerface using novel compounds.
Main Methods:
- Fabrication of inverted PSCs utilizing SAMs and heterocyclic dipolar compounds.
- Investigation of interfacial properties using hydrogen bonding and dipole layer formation.
- Characterization of energy barriers and Fermi level alignment at the SAMs/perovskite interface.
- Performance testing under various environmental stress conditions (humidity, temperature, light).
Main Results:
- A universal p-type heterointerface was successfully constructed using imidazole hydroiodide (ImHI).
- Strong hydrogen bonding and dipole layer formation were observed at the ImHI/perovskite interface.
- Downshifting of the Fermi level reduced energy barriers and facilitated hole extraction.
- A power conversion efficiency of 26.05% was achieved.
- Excellent operational stability was demonstrated: 96% after 2000h (N2), 94% after 800h (55°C/55% RH), and 86% after 1000h (light stress).
Conclusions:
- The ImHI-based p-type heterointerface significantly improves hole extraction in inverted PSCs.
- This approach offers a universal strategy for enhancing PSC performance and long-term stability.
- The developed method provides a pathway towards more efficient and durable perovskite solar technology.
