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Quantum Dot Interface-Mediated CsPbIBr2 Film Growth and Passivation for Efficient Carbon-Based Solar Cells
Xingnan Qi1,2,3,4, Jiantao Wang3,4,5, Furui Tan1
1Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng, Henan 475004, P. R. China.
ACS Applied Materials & Interfaces
|November 11, 2021
Summary
We improved perovskite solar cell efficiency by adding quantum dots (QDs) to the electron transporting layer. This enhances film quality and reduces recombination, boosting performance and stability.
Area of Science:
- Materials Science
- Renewable Energy
- Nanotechnology
Background:
- All-inorganic perovskite materials, specifically CsPbIxBry, show promise for stable semitransparent and tandem solar cells.
- Poor film quality and interfacial recombination hinder the performance of these perovskite solar cells.
Purpose of the Study:
- To enhance the film quality and interfacial charge dynamics of CsPbIBr2 perovskite solar cells.
- To improve the efficiency and stability of carbon-based perovskite solar cells through interface engineering.
Main Methods:
- Incorporation of lead sulfide (PbS) quantum dots (QDs) at the SnO2 electron transporting layer (ETL)/perovskite interface.
- Utilizing PbS QDs as seeds for lattice-matched epitaxial growth of CsPbIBr2 films.
- Characterization of film morphology, crystalline quality, and interfacial properties.
Main Results:
- Achieved pinhole-free CsPbIBr2 films with improved crystallization via QD-assisted growth.
- Reduced defect density and suppressed charge recombination at the ETL/perovskite interface.
- Enhanced power conversion efficiency from 7.00% to 9.09%, with improved reproducibility and ambient stability.
Conclusions:
- Quantum dot-assisted lattice-matched epitaxial growth is an effective strategy for fabricating high-quality perovskite films.
- Interface engineering with QDs significantly boosts the performance and stability of perovskite solar cells.
- This method offers a promising pathway for developing efficient and durable perovskite photovoltaic devices.
