| Alternative title | Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO2 scaffolds |
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| Download | - View final version: Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO₂ scaffolds (PDF, 3.1 MiB)
- View supplementary information: Near-ifrared-II photodetectors based on silver selenide quantum dots on mesoporous TiO₂ scaffolds (PDF, 562 KiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/acsanm.0c02686 |
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| Author | Search for: Graddage, Neil1; Search for: Ouyang, Jianying2; Search for: Lu, Jianping1ORCID identifier: https://orcid.org/0000-0003-3152-7510; Search for: Chu, Ta-Ya1; Search for: Zhang, Yanguang1; Search for: Li, Zhao2; Search for: Wu, Xiaohua1; Search for: Malenfant, Patrick R. L.2ORCID identifier: https://orcid.org/0000-0001-5391-2300; Search for: Tao, Ye1 |
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| Affiliation | - National Research Council of Canada. Advanced Electronics and Photonics
- National Research Council of Canada. Security and Disruptive Technologies
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| Format | Text, Article |
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| Subject | photodetectors; second near-infrared window; Ag2Se colloidal quantum dots; mesoporous TiO2 scaffold; solution processing; photodiode structures |
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| Abstract | 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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| Publication date | 2020-12-02 |
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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 | e288c20d-6cd6-4e8f-a241-64b6dfe7651b |
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| Record created | 2021-06-15 |
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| Record modified | 2021-09-21 |
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