| Autre titre | Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO2 scaffolds |
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| Téléchargement | - Voir la version finale : Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO₂ scaffolds (PDF, 3.1 Mio)
- Voir les données supplémentaires : Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO₂ scaffolds (PDF, 562 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1021/acsanm.0c02686 |
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| Auteur | Rechercher : Graddage, Neil1; Rechercher : Ouyang, Jianying2; Rechercher : Lu, Jianping1Identifiant ORCID : https://orcid.org/0000-0003-3152-7510; Rechercher : Chu, Ta-Ya1; Rechercher : Zhang, Yanguang1; Rechercher : Li, Zhao2; Rechercher : Wu, Xiaohua1; Rechercher : Malenfant, Patrick R. L.2Identifiant ORCID : https://orcid.org/0000-0001-5391-2300; Rechercher : Tao, Ye1 |
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| Affiliation | - Conseil national de recherches Canada. Électronique et photonique avancées
- Conseil national de recherches Canada. Technologies de sécurité et de rupture
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| Format | Texte, Article |
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| Sujet | photodetectors; second near-infrared window; Ag2Se colloidal quantum dots; mesoporous TiO2 scaffold; solution processing; photodiode structures |
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| Résumé | Biosensing applications are driving an increase in demand for low-cost photodetectors with sensitivity between 1000 and 1400 nm. Recently, the sensitivity of Ag₂Se colloidal quantum dot based devices in this wavelength range has been observed. In this work we make the first demonstration of an Ag₂Se photodiode device with sensitivity in this entire range. By employing secondary phosphine to elevate the precursor reactivity, we achieved accurate size control of the Ag₂Se nanocrystals with a distinct excitonic absorption peak. These nanocrystals were deposited from solution into a mesoporous TiO₂ scaffold, similar to that used in dye-sensitized solar cells, to increase the light absorption and charge separation and reduce the exciton diffusion length. By incorporation of a suitable hole-transporting layer between the active layer and Ag anode, the resulting devices showed a responsivity of 4.17 mA/W at a wavelength of 1200 nm. These results demonstrate that Ag₂Se colloidal quantum dots offer a low-toxicity route for low-cost fabrication of near-infrared photodetectors. |
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| Date de publication | 2020-12-02 |
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| Maison d’édition | American Chemical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | e288c20d-6cd6-4e8f-a241-64b6dfe7651b |
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| Enregistrement créé | 2021-06-15 |
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| Enregistrement modifié | 2021-09-21 |
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