| Alternative title | Ag2Te colloidal quantum dots for near-infrared-II photodetectors |
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| DOI | Resolve DOI: https://doi.org/10.1021/acsanm.1c03030 |
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| Author | Search for: Ouyang, Jianying1ORCID identifier: https://orcid.org/0000-0001-5700-9506; Search for: Graddage, Neil2; Search for: Lu, Jianping2ORCID identifier: https://orcid.org/0000-0003-3152-7510; Search for: Zhong, Yufang2; Search for: Chu, Ta-Ya2; Search for: Zhang, Yanguang2; Search for: Wu, Xiaohua2; Search for: Kodra, Oltion3; Search for: Li, Zhao1ORCID identifier: https://orcid.org/0000-0002-0287-2430; Search for: Tao, Ye2; Search for: Ding, Jianfu1 |
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| Affiliation | - National Research Council of Canada. Security and Disruptive Technologies
- National Research Council of Canada. Advanced Electronics and Photonics
- National Research Council of Canada. Energy, Mining and Environment
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| Format | Text, Article |
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| Subject | silver telluride nanocrystals; distinct excitonic absorption peak; photoluminescence high quantum yield; near-infrared II; photodiode-type photodetector |
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| Abstract | 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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| Publication date | 2021-12-02 |
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| Publisher | American Chemical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bd8727d4-fbe2-4ac5-9edd-0613b6834962 |
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| Record created | 2022-09-02 |
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| Record modified | 2022-09-02 |
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