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Hot-Carrier Cooling Regulation for Mixed Sn-Pb Perovskite Solar Cells
Wenjian Yan1, Chongwen Li2, Cheng Peng1
1College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, China.
Advanced Materials (Deerfield Beach, Fla.)
|January 21, 2024
Summary
Introducing tin(II) oxalate into tin-lead perovskite solar cells improves efficiency by regulating hot-carrier cooling and enhancing film quality. This leads to higher power conversion efficiencies and improved stability in single-junction and tandem devices.
Area of Science:
- Materials Science
- Photovoltaics
- Renewable Energy
Background:
- Rapid hot-carrier cooling in solar cells causes energy loss, limiting efficiency, particularly in tin-lead perovskites.
- Existing strategies to mitigate hot-carrier cooling often introduce other issues, such as carrier transport problems.
Purpose of the Study:
- To investigate the effect of tin(II) oxalate (SnC2O4) on hot-carrier cooling dynamics in tin-lead perovskite solar cells.
- To enhance the efficiency and stability of perovskite solar cells through improved carrier management and film crystallization.
Main Methods:
- Incorporation of tin(II) oxalate into the tin-lead perovskite precursor solution.
- Analysis of carrier cooling rates, carrier diffusion length, and carrier lifetime.
- Characterization of perovskite film crystallization, defect passivation, and interface properties.
Main Results:
- Tin(II) oxalate addition slowed hot-carrier cooling, extended carrier lifetime, and increased carrier diffusion length.
- SnC2O4 regulated perovskite crystallization, yielding larger grains and passivating Sn vacancies by inhibiting Sn2+ oxidation.
- Sn-Pb cells treated with SnC2O4 achieved a champion efficiency of 23.36% (single-junction) and 27.56% (tandem), with enhanced stability.
Conclusions:
- Tin(II) oxalate is an effective additive for optimizing hot-carrier dynamics and film quality in tin-lead perovskites.
- This approach offers a promising strategy for developing highly efficient and stable perovskite solar cells, including tandem configurations.
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