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Efficient and stable solution-processed planar perovskite solar cells via contact passivation
Hairen Tan1, Ankit Jain1, Oleksandr Voznyy1
1Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada.
Science (New York, N.Y.)
|February 4, 2017
Summary
Low-temperature solution-processed planar perovskite solar cells (PSCs) achieve over 20% efficiency using a novel chlorine-capped TiO2 nanocrystal passivation layer. These stable PSCs maintain performance for 500 hours under continuous operation.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- Planar perovskite solar cells (PSCs) processed at low temperatures (<150°C) are attractive for scalable manufacturing and flexible electronics.
- Existing PSCs require electron-selective layers compatible with low-temperature solution processing.
- Interfacial recombination and poor interface binding limit the performance of low-temperature PSCs.
Purpose of the Study:
- To develop a contact-passivation strategy for low-temperature solution-processed planar perovskite solar cells.
- To improve interfacial properties and mitigate recombination losses.
- To achieve high efficiency and operational stability in PSCs.
Main Methods:
- Fabrication of planar perovskite solar cells using low-temperature solution processing (<150°C).
- Application of a chlorine-capped TiO2 colloidal nanocrystal film as an electron-selective and passivation layer.
- Performance and stability testing under continuous 1-sun illumination at room temperature.
Main Results:
- Certified power conversion efficiencies of 20.1% (0.049 cm²) and 19.5% (1.1 cm²) were achieved.
- The chlorine-capped TiO2 layer effectively mitigated interfacial recombination and improved interface binding.
- Solar cells exceeding 20% efficiency retained 90% of their initial performance after 500 hours of operation.
Conclusions:
- A novel contact-passivation strategy using chlorine-capped TiO2 nanocrystals enables high-efficiency, low-temperature solution-processed PSCs.
- The developed PSCs demonstrate excellent operational stability under prolonged illumination.
- This approach is promising for the commercialization of perovskite solar technology.
