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Positional Methylation Isomer Additives Regulate the Degradation Pathway of Perovskites
Zhenda Huang1,2, Boyuan Liu1,2, Zheng Liang1,2
1Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, China.
Methyl substitution in additives enhances perovskite solar cell (PSC) efficiency and stability. Positional isomers 1-methylhydantoin and 5-methylhydantoin show different stability effects, with 5-MH achieving 26.84% efficiency and 92% stability after 2000 hours.
Area of Science:
- Materials Science
- Photovoltaics
- Organic Chemistry
Background:
- Multi-active-site additives improve perovskite solar cell (PSC) efficiency and stability.
- Efficient interaction between additives and perovskite remains a challenge.
- Methyl substitution offers a way to modulate additive reactivity.
Purpose of the Study:
- Investigate the impact of positional methylation on additive reactivity and PSC performance.
- Design and synthesize two methylhydantoin isomers: 1-methylhydantoin (1-MH) and 5-methylhydantoin (5-MH).
- Evaluate the effect of these isomers on PSC efficiency and long-term operational stability.
Main Methods:
- Synthesized 1-MH and 5-MH isomers.
- Incorporated isomers into PSCs as additives.
- Tested device efficiency and operational stability under ISOS-L2 conditions.
Main Results:
- Both 1-MH and 5-MH improved PSC efficiency.
- 5-MH incorporation led to a power conversion efficiency (PCE) of 26.84% (certified 26.78%).
- 5-MH demonstrated outstanding operational stability, retaining 92% of initial PCE after 2000 hours.
Conclusions:
- Rational positional methylation significantly enhances additive multisite reactivity with perovskite materials.
- 5-MH is a promising additive for achieving high efficiency and long-term stability in PSCs.
- Methyl group's positional configuration is critical for optimizing additive performance in PSCs.
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