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Zn 2+ ion doping for structural modulation of lead-free Sn-based perovskite solar cells
Sn-based perovskites have intrinsic defects, such as Sn vacancies, oxidised components (Sn 4+ ), and local lattice strain in the perovskite crystalline structure. In this study, Zn metal powder (Zn 0 ) was introduced to reduce Sn oxidation in the solution step based on the redox potential difference...
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Published in: | Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-05, Vol.11 (20), p.10605-10611 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Sn-based perovskites have intrinsic defects, such as Sn vacancies, oxidised components (Sn
4+
), and local lattice strain in the perovskite crystalline structure. In this study, Zn metal powder (Zn
0
) was introduced to reduce Sn oxidation in the solution step based on the redox potential difference. Additionally, Zn
2+
was introduced in the perovskite precursor, which decreased the intrinsic defects and lattice strain of the perovskite films. The diffusion length, particularly that of the hole, increased with a reduction in the lattice strain, and Zn doping led to interfacial energy-level alignment of the perovskite and hole-transporting layers. The reduced lattice strain decreased the defect density and charge carrier recombination of perovskite devices. The power conversion efficiency of the Zn-doped Sn-based perovskite solar cell was improved to 11.39% compared to the 8.56% of the reference device. |
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ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/D2TA09793A |