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Double Layer Composite Electrode Strategy for Efficient Perovskite Solar Cells with Excellent Reverse-Bias Stability
Chaofan Jiang1, Junjie Zhou1, Hang Li1
1State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.
Researchers developed a new composite electrode for perovskite solar cells (PSCs) to enhance stability without compromising efficiency. This innovation addresses key challenges in deploying next-generation photovoltaics.
Area of Science:
- Materials Science
- Renewable Energy
Background:
- Perovskite solar cells (PSCs) are promising next-generation photovoltaics.
- Insufficient stability, especially under reverse bias, hinders large-scale PSC deployment.
Purpose of the Study:
- To improve the stability of PSCs using a novel composite electrode.
- To maintain high power conversion efficiency (PCE) while enhancing device longevity.
Main Methods:
- Fabrication of a composite electrode using transparent conducting oxide (TCO) and a low-cost metal.
- Characterization of the composite electrode's effect on PSC efficiency and stability under operational stress.
Main Results:
- The composite electrode-PSC achieved a PCE of 23.7% (certified 23.2%).
- Excellent stability was demonstrated, retaining 95% of initial PCE under 4.0 V reverse bias for 60 s.
- Over 92% of initial PCE was maintained after 1000 hours of continuous light soaking.
Conclusions:
- The TCO/metal composite electrode effectively blocks ion migration and detrimental chemical reactions.
- This strategy significantly enhances PSC stability and longevity.
- The composite electrode approach offers a versatile method for improving PSC performance and can be applied to various TCO/metal combinations.
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