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Composition Engineering in Two-Dimensional Pb-Sn-Alloyed Perovskites for Efficient and Stable Solar Cells
Yani Chen1, Yong Sun1, Jiajun Peng1
1Department of Materials Science , Fudan University , 200433 Shanghai , China.
ACS Applied Materials & Interfaces
|June 6, 2018
Summary
Tin-based perovskite solar cells overcome stability issues through composition engineering. Alloying lead-tin improves crystallization and efficiency, achieving nearly 6% power conversion efficiency with reduced hysteresis.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Chemistry
Background:
- Environmentally friendly tin (Sn)-based metallic halide perovskites face challenges with oxidation and poor morphology.
- Two-dimensional (2D) Ruddlesden-Popper perovskites offer potential for enhanced stability but require optimization.
Purpose of the Study:
- To engineer the composition of Pb-Sn-alloyed 2D Ruddlesden-Popper perovskites for improved solar cell performance and stability.
- To investigate the role of tin incorporation in enhancing perovskite film quality and optoelectronic properties.
Main Methods:
- Compositional engineering of (BA)2(MA)3Pb4-xSnxI13 perovskite formulations.
- Fabrication of 2D perovskite thin films utilizing their self-assembly characteristics.
- Photophysical characterization including trap density and quantum confinement analysis.
Main Results:
- Smooth, high-surface-coverage thin films were formed without additives.
- Tin incorporation improved crystallization, crystal orientation, and narrowed the bandgap.
- Optimal tin content (25 mol%) minimized trap density and quantum confinement, enhancing charge separation.
- Achieved a power conversion efficiency close to 6% with suppressed hysteresis in optimized solar cells.
Conclusions:
- Compositional engineering of Pb-Sn-alloyed 2D perovskites is a viable strategy for efficient and stable solar cells.
- Tin plays a crucial role in enhancing the structural and optoelectronic properties of these perovskite materials.
- The optimized perovskite composition demonstrates significant potential for next-generation photovoltaic applications.
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