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Enhancing the Efficiency and Stability of Inverted Perovskite Solar Cells and Modules through Top Interface
Qiuju Liu1,2, Lei Ding3, Jianfei Fu1
1School of Materials Science and Engineering (MSE), NingboTech University, No. 1 South Qianhu Road, Ningbo, 315211, China.
Angewandte Chemie (International Ed. in English)
|November 8, 2024
Summary
Interface modification using non-fullerene acceptors (NFAs) like Y6-BO and Y7-BO significantly boosts inverted perovskite solar cell performance. Y7-BO modification achieved a 25.82% power conversion efficiency and enhanced device stability.
Area of Science:
- Materials Science
- Energy Science
- Photovoltaics
Background:
- Interface engineering is critical for high-performance inverted perovskite photovoltaics (i-PPVs).
- Traditional interface modification methods may have limitations in defect passivation and charge extraction.
Purpose of the Study:
- To investigate the use of non-fullerene acceptors (NFAs), specifically Y6-BO and Y7-BO, for modifying the perovskite/electron transport layer (ETL) interface in i-PPVs.
- To evaluate the impact of NFA modification on device efficiency, stability, and scalability.
Main Methods:
- Utilized Y6-BO and Y7-BO to modify the perovskite/ETL interface in i-PPVs.
- Employed non-polar solvents for NFA application to preserve perovskite film integrity.
- Investigated the effect of NFAs on surface defect passivation and electron extraction using phenyl-C61-butyric acid methyl ester (PCBM) as the ETL.
Main Results:
- NFA modification effectively passivated surface defects and improved electron extraction compared to traditional molecules.
- The inverted perovskite solar cell (i-PSC) modified with Y7-BO achieved a power conversion efficiency (PCE) of 25.82%.
- Perovskite solar modules (i-PSMs) with effective areas up to 1160 cm² achieved record certified PCEs (23.05%, 22.32%, 21.1%), demonstrating scalability.
- Enhanced interface mechanical strength led to improved environmental and operational stability, with Y7-BO modified cells retaining 94.4% efficiency after 1522 hours of aging.
Conclusions:
- Non-fullerene acceptors, particularly Y7-BO, are highly effective for interface modification in i-PPVs.
- NFA modification offers a promising strategy for achieving high-efficiency, stable, and scalable perovskite solar cells and modules.
- The developed method overcomes limitations of previous interface engineering techniques.
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