| Autre titre | Ag2Te colloidal quantum dots for near-infrared-II photodetectors |
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| DOI | Trouver le DOI : https://doi.org/10.1021/acsanm.1c03030 |
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| Auteur | Rechercher : Ouyang, Jianying1Identifiant ORCID : https://orcid.org/0000-0001-5700-9506; Rechercher : Graddage, Neil2; Rechercher : Lu, Jianping2Identifiant ORCID : https://orcid.org/0000-0003-3152-7510; Rechercher : Zhong, Yufang2; Rechercher : Chu, Ta-Ya2; Rechercher : Zhang, Yanguang2; Rechercher : Wu, Xiaohua2; Rechercher : Kodra, Oltion3; Rechercher : Li, Zhao1Identifiant ORCID : https://orcid.org/0000-0002-0287-2430; Rechercher : Tao, Ye2; Rechercher : Ding, Jianfu1 |
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| Affiliation | - Conseil national de recherches du Canada. Technologies de sécurité et de rupture
- Conseil national de recherches du Canada. Électronique et photonique avancées
- Conseil national de recherches du Canada. Énergie, les mines et l'environnement
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| Format | Texte, Article |
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| Sujet | silver telluride nanocrystals; distinct excitonic absorption peak; photoluminescence high quantum yield; near-infrared II; photodiode-type photodetector |
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| Résumé | Ag₂Te colloidal quantum dots (QDs) are an excellent nanomaterial for applications in the second near-infrared window (NIR-II, 1000–1700 nm). However, synthesis with narrow size distribution and high photoluminescence quantum yield (PL QY) is challenging. In this study, we systematically investigate critical synthesis parameters affecting an organic phase process. We show that high Ag/Te feed ratio leads to smaller size and higher PL QY; under 4:1 Ag/Te feed molar ratio, addition of secondary phosphine leads to narrower size distribution and excellent colloidal stability; under 6:1 Ag/Te feed molar ratio, excess 1-dodecanethiol as a strong ligand slows the nucleation and results in fewer nuclei, leading to a broad size distribution and poor optical properties; additional trioctylphosphine as a weak ligand provides better colloidal stability; and another weak ligand tributylphosphine improves QD colloidal stability, focuses size distribution, and enhances PL QY. A noninjection method maintains narrow size distribution in upscaling syntheses. After optimization, relatively large Ag₂Te QDs with distinct excitonic absorption peaks (∼1050–1450 nm) and PL emission peak 1.3–1.7 μm (QY up to 6.2%) were obtained. NIR-II photodetection has been demonstrated with a responsivity of ∼1.5 mA/W at 1400 nm. |
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| Date de publication | 2021-12-02 |
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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 | bd8727d4-fbe2-4ac5-9edd-0613b6834962 |
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| Enregistrement créé | 2022-09-02 |
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| Enregistrement modifié | 2022-09-02 |
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