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Published on: September 8, 2017
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Steering perovskite precursor solutions for multijunction photovoltaics
Shuaifeng Hu1,2, Junke Wang3, Pei Zhao3,4
1Clarendon Laboratory, Department of Physics, University of Oxford, Oxford, UK. shuaifeng.hu@physics.ox.ac.uk.
Nature
|December 23, 2024
Summary
Researchers enhanced narrow-bandgap tin-lead perovskite films using amino acid salts, boosting multijunction solar cell power conversion efficiencies (PCEs) and stability. This breakthrough sets a new benchmark for advanced photovoltaic devices.
Area of Science:
- Materials Science
- Renewable Energy
- Solid-State Physics
Background:
- Multijunction photovoltaics (PVs) offer higher power conversion efficiencies (PCEs) than single-junction cells.
- Narrow-bandgap (NBG) tin-lead perovskites are crucial for advancing thin-film PV technology.
Purpose of the Study:
- To understand the chemistry of tin-lead perovskite precursor solutions.
- To improve the semiconducting quality and optoelectronic properties of perovskite films for enhanced PV performance.
Main Methods:
- Investigated Sn(II) species interactions within precursor solutions.
- Identified the roles of carboxylic acid and ammonium functional groups in film formation and properties.
- Utilized amino acid salts to combine beneficial functional groups for synergistic effects.
Main Results:
- Amino acid salts significantly improved perovskite film quality and homogeneity.
- Achieved PCEs of 23.9% (single-junction), 29.7% (double-junction), and 28.7% (triple-junction).
- Demonstrated stable triple-junction cells (28.4% PCE) retaining 80% efficiency after 860h, and quadruple-junction cells with 27.9% PCE and 4.94V open-circuit voltage.
Conclusions:
- Amino acid salts represent a novel strategy for high-performance perovskite PVs.
- This work establishes a new benchmark for multijunction photovoltaic devices.
- The findings pave the way for next-generation, highly efficient, and stable solar cells.
