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Surface Planarization-Epitaxial Growth Enables Uniform 2D/3D Heterojunctions for Efficient and Stable Perovskite
Dongxu Lin1, Jun Fang1, Sibo Li1
1Shenzhen Key Laboratory of Intelligent Robotics and Flexible Manufacturing Systems, Department of Mechanical and Energy Engineering, SUSTech Energy Institute for Carbon Neutrality, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 3, 2024
Summary
Surface planarization creates uniform 2D/3D perovskite heterojunctions, boosting perovskite solar cell efficiency and stability by minimizing defects and improving charge extraction.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- 2D/3D halide perovskite heterojunctions enhance perovskite solar cell performance.
- Interfacial defects and poor 2D layer coverage limit stability and charge extraction.
Purpose of the Study:
- Develop a surface planarization strategy for uniform 2D/3D perovskite heterojunctions.
- Improve long-term stability and charge extraction in perovskite solar cells.
Main Methods:
- Surface planarization of 3D perovskite.
- Vapor-assisted process for epitaxial growth of 2D/3D heterojunctions.
- Fabrication and characterization of perovskite solar cells and modules.
Main Results:
- Achieved stabilized power conversion efficiency of 25.97% for 1.55 eV bandgap perovskite solar cells.
- Demonstrated universality with a 1.57 eV bandgap device achieving 25.31% efficiency and 87.6% fill factor.
- Perovskite solar modules reached 20.75% certified efficiency over 24.04 cm² with 80.0% fill factor.
Conclusions:
- The strategy enables uniform 2D/3D interfaces, suppressing nonradiative recombination and enhancing charge extraction.
- Uniform 2D/3D modules show excellent operational stability, retaining 96.9% efficiency after 1246 h at 65 °C.
- The developed method offers a promising pathway for highly efficient and stable perovskite solar cells and modules.
