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Robust chelated lead octahedron surface for efficient and stable perovskite solar cells
Bin Wen1,2, Tian Chen1,2, Qixin Yin1,2
1School of Materials, Shenzhen Campus of Sun Yat-sen University, No. 66, Gongchang Road, Shenzhen, 518107, P. R. China.
Nature Communications
|September 4, 2024
Summary
Surface treatment of perovskite materials using N, N'-Dimethyl-1,2-ethanediamine stabilizes the perovskite structure. This enhances the performance and durability of perovskite solar cells, achieving high power conversion efficiency and long-term stability.
Area of Science:
- Materials Science
- Photovoltaics
- Chemistry
Background:
- Perovskite materials offer excellent photoelectric properties but suffer from surface defects and instability.
- The PbI6 octahedron, while crucial for performance, contributes to surface fragility.
Purpose of the Study:
- To develop a surface treatment for perovskite materials to enhance stability and performance.
- To investigate the passivation effect of bidentate ligands on perovskite surfaces.
Main Methods:
- Treatment of perovskite surfaces with N, N -Dimethyl-1,2-ethanediamine.
- In-situ formation of a lead iodide chelates layer.
- Characterization of surface passivation and defect inhibition.
Main Results:
- A robust chelated lead octahedron layer was formed, stabilizing the perovskite.
- Defect generation, ion migration, and skeleton collapse were significantly inhibited.
- Prolonged carrier lifetime and adjusted surface energy levels were observed.
Conclusions:
- N, N -Dimethyl-1,2-ethanediamine effectively passivates perovskite surfaces, improving material stability.
- The treated perovskite solar cells achieved a power conversion efficiency of 25.7% and maintained >90% stability after 1000 hours of aging.
