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Electron injection and defect passivation for high-efficiency mesoporous perovskite solar cells
Jiale Liu1, Xiayan Chen2, Kaizhong Chen1
1Michael Grätzel Center for Mesoscopic Solar Cells, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, Hubei 430074, P.R. China.
Science (New York, N.Y.)
|March 14, 2024
Summary
Printable mesoscopic perovskite solar cells (p-MPSCs) now achieve 22.2% efficiency. Modifications reduced recombination, improving performance and stability for this emerging solar technology.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Printable mesoscopic perovskite solar cells (p-MPSCs) offer simplified fabrication without a hole-transport layer.
- Traditional p-MPSCs exhibit lower power conversion efficiencies, around 19%.
Purpose of the Study:
- To design and analyze an improved p-MPSC structure to enhance power conversion efficiency and stability.
- To investigate strategies for reducing recombination losses in p-MPSCs.
Main Methods:
- Device simulation and carrier dynamics analysis were employed.
- A novel p-MPSC architecture incorporated mesoporous titanium dioxide, zirconium dioxide, and carbon infiltrated with perovskite.
- Ammonium phosphate modification was used to reduce nonradiative recombination.
Main Results:
- The designed p-MPSC achieved a power conversion efficiency of 22.2%.
- Carrier separation was enhanced through 3D electron injection and long-distance hole diffusion.
- Stability was demonstrated, retaining 97% of initial efficiency after 750 hours of testing at 55°C.
Conclusions:
- The optimized p-MPSC design significantly boosts efficiency and stability.
- Reduced recombination at interfaces and contacts is key to high performance.
- This work advances the potential of printable perovskite solar cells for practical applications.
