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Interface Regulation for Efficient and Stable Perovskite Solar Cells through Potassium Citrate Molecules
Xiaodan Tang1, Bo Li1, Mengmeng Chen1
1School of Materials Science and Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|March 3, 2023
Summary
Researchers improved perovskite solar cell (PSC) efficiency and stability by adding potassium citrate (PC) to SnO2 films. This method passivates defects, boosting power conversion efficiency (PCE) and long-term performance.
Area of Science:
- Materials Science
- Renewable Energy
- Photovoltaics
Background:
- Perovskite solar cells (PSCs) are promising for low-cost electricity generation.
- Improving PSC efficiency and operational stability remains a critical research challenge.
Purpose of the Study:
- To enhance the quality of SnO2 electron transport layers in PSCs.
- To develop a strategy for improving PSC efficiency and long-term stability.
Main Methods:
- Incorporation of potassium citrate (PC) into SnO2 nanoparticle solutions.
- Passivation of interface defects between perovskite and SnO2 layers using PC's functional groups.
- Fabrication and testing of photovoltaic devices.
Main Results:
- Achieved a champion power conversion efficiency (PCE) of 22.79%.
- Demonstrated significantly suppressed degradation, retaining 87.6% of initial PCE after 2850 hours of ambient storage.
- Maintained 95.5% of initial PCE under 1000 hours of continuous 1-sun illumination.
Conclusions:
- Potassium citrate is an effective additive for improving SnO2 film quality in PSCs.
- PC introduction enhances both the efficiency and stability of perovskite solar cells.
- The developed method offers a viable pathway towards commercially competitive PSCs.
