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A Graded Redox Interfacial Modifier for High-Performance Perovskite Solar Cells.
Wenjing Qi1,2, Zhe Liu1, Xinrui Xie1
1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering; International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China.
Angewandte Chemie (International Ed. in English)
|September 16, 2024
Summary
Cobalt hexammine sulfamate enhances perovskite solar cell stability and efficiency by modifying tin oxide. This redox interfacial modifier improves perovskite crystallinity and device lifespan, achieving high power conversion efficiencies.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) are emerging as a promising alternative to silicon photovoltaics.
- Common PSCs use tin oxide (SnO2) and spiro-OMeTAD, but suffer from poor lifespan due to material instability.
- The role of SnO2 in PSC stability has been underexplored.
Purpose of the Study:
- To investigate the impact of SnO2 modification on PSC performance and longevity.
- To enhance both power conversion efficiency (PCE) and operational stability of PSCs.
- To explore the use of redox interfacial modifiers for improved PSCs.
Main Methods:
- Incorporation of cobalt hexammine sulfamate as a redox interfacial modifier for SnO2.
- Analysis of redox reactions and their effect on SnO2 surface and bulk properties.
- Fabrication and testing of modified PSCs for efficiency and stability.
Main Results:
- Modified SnO2 with cobalt hexammine sulfamate improved perovskite crystallinity by passivating Pb2+ and relieving stress.
- Achieved a maximum power conversion efficiency (PCE) of 24.91% in the fabricated PSCs.
- Devices maintained 93.8% of their initial PCE after 1000 hours of continuous operation.
Conclusions:
- Cobalt hexammine sulfamate effectively enhances both the efficiency and stability of perovskite solar cells.
- Redox interfacial modification of SnO2 is a viable strategy for developing high-performance and durable PSCs.
- Cobalt complexes show significant potential as interfacial modifiers in perovskite photovoltaics.
