Lattice-mismatched and twisted multi-layered materials for efficient solar cells
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929567356157952 |
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| author | Manousakis, Efstratios |
| author_facet | Manousakis, Efstratios |
| contents | We argue that alternating-layer structures of lattice mismatched or misaligned (twisted) atomically-thin layers should be expected to be more efficient absorbers of the broad-spectrum of solar radiation than the bulk material of each individual layer. In such mismatched layer-structures the conduction and valence bands of the bulk material, split into multiple minibands separated by minigaps confined to a small-size emerging Brillouin zone due to band-folding. We extended the Shockley-Queisser approach to calculate the photovoltaic efficiency for a band split into minibands of bandwidth $ΔE$ and mini-gaps $δG$ to model the case when such structures are used as solar cells. We find a significant efficiency enhancement due to impact ionization processes, especially in the limit of small but non-zero $δG$, and a dramatic increase when fully concentrated sun-light is used. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_22395 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Lattice-mismatched and twisted multi-layered materials for efficient solar cells Manousakis, Efstratios Materials Science We argue that alternating-layer structures of lattice mismatched or misaligned (twisted) atomically-thin layers should be expected to be more efficient absorbers of the broad-spectrum of solar radiation than the bulk material of each individual layer. In such mismatched layer-structures the conduction and valence bands of the bulk material, split into multiple minibands separated by minigaps confined to a small-size emerging Brillouin zone due to band-folding. We extended the Shockley-Queisser approach to calculate the photovoltaic efficiency for a band split into minibands of bandwidth $ΔE$ and mini-gaps $δG$ to model the case when such structures are used as solar cells. We find a significant efficiency enhancement due to impact ionization processes, especially in the limit of small but non-zero $δG$, and a dramatic increase when fully concentrated sun-light is used. |
| title | Lattice-mismatched and twisted multi-layered materials for efficient solar cells |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.22395 |