Laser-Annealing and Solid-Phase Epitaxy of Selenium Thin-Film Solar Cells
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866929642830561280 |
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| author | Nielsen, Rasmus Hemmingsen, Tobias H. Bonczyk, Tobias G. Hansen, Ole Chorkendorff, Ib Vesborg, Peter C. K. |
| author_facet | Nielsen, Rasmus Hemmingsen, Tobias H. Bonczyk, Tobias G. Hansen, Ole Chorkendorff, Ib Vesborg, Peter C. K. |
| contents | Selenium has resurged as a promising photovoltaic material in solar cell research due to its wide direct bandgap of 1.95 eV, making it a suitable candidate for a top cell in tandem photovoltaic devices. However, the optoelectronic quality of selenium thin-films has been identified as a key bottleneck for realizing high-efficiency selenium solar cells. In this study, we present a novel approach for crystallizing selenium thin-films using laser-annealing as an alternative to the conventionally used thermal annealing strategy. By laser-annealing through a semitransparent substrate, a buried layer of high-quality selenium crystallites is formed and used as a growth template for solid-phase epitaxy. The resulting selenium thin-films feature larger and more preferentially oriented grains with a negligible surface roughness in comparison to thermally annealed selenium thin-films. We fabricate photovoltaic devices using this strategy, and demonstrate a record ideality factor of n=1.37, a record fill factor of FF=63.7%, and a power conversion efficiency of PCE=5.0%. The presented laser-annealing strategy is universally applicable and is a promising approach for crystallizing a wide range of photovoltaic materials where high temperatures are needed while maintaining a low substrate temperature. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_11311 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Laser-Annealing and Solid-Phase Epitaxy of Selenium Thin-Film Solar Cells Nielsen, Rasmus Hemmingsen, Tobias H. Bonczyk, Tobias G. Hansen, Ole Chorkendorff, Ib Vesborg, Peter C. K. Materials Science Applied Physics Selenium has resurged as a promising photovoltaic material in solar cell research due to its wide direct bandgap of 1.95 eV, making it a suitable candidate for a top cell in tandem photovoltaic devices. However, the optoelectronic quality of selenium thin-films has been identified as a key bottleneck for realizing high-efficiency selenium solar cells. In this study, we present a novel approach for crystallizing selenium thin-films using laser-annealing as an alternative to the conventionally used thermal annealing strategy. By laser-annealing through a semitransparent substrate, a buried layer of high-quality selenium crystallites is formed and used as a growth template for solid-phase epitaxy. The resulting selenium thin-films feature larger and more preferentially oriented grains with a negligible surface roughness in comparison to thermally annealed selenium thin-films. We fabricate photovoltaic devices using this strategy, and demonstrate a record ideality factor of n=1.37, a record fill factor of FF=63.7%, and a power conversion efficiency of PCE=5.0%. The presented laser-annealing strategy is universally applicable and is a promising approach for crystallizing a wide range of photovoltaic materials where high temperatures are needed while maintaining a low substrate temperature. |
| title | Laser-Annealing and Solid-Phase Epitaxy of Selenium Thin-Film Solar Cells |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2306.11311 |