Photoinduced charge injection from shallow point defects in diamond into water
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910536763965440 |
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| author | Xu, Kang Pagliero, Daniela Morales, Gabriel I. Lopez Flick, Johannes Wolcott, Abraham Meriles, Carlos A. |
| author_facet | Xu, Kang Pagliero, Daniela Morales, Gabriel I. Lopez Flick, Johannes Wolcott, Abraham Meriles, Carlos A. |
| contents | Thanks to its low or negative surface electron affinity and chemical inertness, diamond is attracting broad attention as a source material of solvated electrons produced by optical excitation of the solid-liquid interface. Unfortunately, its wide bandgap typically imposes the use of wavelengths in the ultra-violet range, hence complicating practical applications. Here we probe the photocurrent response of water surrounded by single-crystal diamond surfaces engineered to host shallow nitrogen-vacancy (NV) centers. We observe clear signatures of diamond-induced photocurrent generation throughout the visible range and for wavelengths reaching up to 594 nm. Experiments as a function of laser power suggest that NV centers and other co-existing defects - likely in the form of surface traps - contribute to carrier injection, though we find that NVs dominate the system response in the limit of high illumination intensities. Given our growing understanding of near-surface NV centers and adjacent point defects, these results open new perspectives in the application of diamond-liquid interfaces to photo-carrier-initiated chemical and spin processes in fluids. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_15019 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Photoinduced charge injection from shallow point defects in diamond into water Xu, Kang Pagliero, Daniela Morales, Gabriel I. Lopez Flick, Johannes Wolcott, Abraham Meriles, Carlos A. Materials Science Thanks to its low or negative surface electron affinity and chemical inertness, diamond is attracting broad attention as a source material of solvated electrons produced by optical excitation of the solid-liquid interface. Unfortunately, its wide bandgap typically imposes the use of wavelengths in the ultra-violet range, hence complicating practical applications. Here we probe the photocurrent response of water surrounded by single-crystal diamond surfaces engineered to host shallow nitrogen-vacancy (NV) centers. We observe clear signatures of diamond-induced photocurrent generation throughout the visible range and for wavelengths reaching up to 594 nm. Experiments as a function of laser power suggest that NV centers and other co-existing defects - likely in the form of surface traps - contribute to carrier injection, though we find that NVs dominate the system response in the limit of high illumination intensities. Given our growing understanding of near-surface NV centers and adjacent point defects, these results open new perspectives in the application of diamond-liquid interfaces to photo-carrier-initiated chemical and spin processes in fluids. |
| title | Photoinduced charge injection from shallow point defects in diamond into water |
| topic | Materials Science |
| url | https://arxiv.org/abs/2407.15019 |