Sulfur Vacancies Limit the Open-circuit Voltage of Sb2S3 Solar Cells
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866913631112790016 |
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| author | Wang, Xinwei Kavanagh, Seán R. Walsh, Aron |
| author_facet | Wang, Xinwei Kavanagh, Seán R. Walsh, Aron |
| contents | Antimony sulfide (Sb2S3) is a promising candidate as an absorber layer for single-junction solar cells and the top subcell in tandem solar cells. However, the power conversion efficiency of Sb2S3-based solar cells has remained stagnant over the past decade, largely due to trap-assisted non-radiative recombination. Here we assess the trap-limited conversion efficiency of Sb2S3 by investigating non-radiative carrier capture rates for intrinsic point defects using first-principles calculations and Sah-Shockley statistics. Our results show that sulfur vacancies act as effective recombination centers, limiting the maximum efficiency of Sb2S3 to 16% light to electricity. The equilibrium concentrations of sulfur vacancies remain relatively high regardless of growth conditions, indicating the intrinsic limitations imposed by these vacancies on the performance of Sb2S3. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_10560 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sulfur Vacancies Limit the Open-circuit Voltage of Sb2S3 Solar Cells Wang, Xinwei Kavanagh, Seán R. Walsh, Aron Materials Science Antimony sulfide (Sb2S3) is a promising candidate as an absorber layer for single-junction solar cells and the top subcell in tandem solar cells. However, the power conversion efficiency of Sb2S3-based solar cells has remained stagnant over the past decade, largely due to trap-assisted non-radiative recombination. Here we assess the trap-limited conversion efficiency of Sb2S3 by investigating non-radiative carrier capture rates for intrinsic point defects using first-principles calculations and Sah-Shockley statistics. Our results show that sulfur vacancies act as effective recombination centers, limiting the maximum efficiency of Sb2S3 to 16% light to electricity. The equilibrium concentrations of sulfur vacancies remain relatively high regardless of growth conditions, indicating the intrinsic limitations imposed by these vacancies on the performance of Sb2S3. |
| title | Sulfur Vacancies Limit the Open-circuit Voltage of Sb2S3 Solar Cells |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.10560 |