Twisted graphene-assisted photocarrier transfer from HgSe colloidal quantum dots into silicon with enhanced collection and transport efficiency
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
Author(s)
Detail(s)
Original language | English |
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Article number | 241104 |
Pages (from-to) | 1-5 |
Journal / Publication | Applied Physics Letters |
Volume | 110 |
Issue number | 24 |
Publication status | Published - 12 Jun 2017 |
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DOI | DOI |
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Attachment(s) | Documents
Publisher's Copyright Statement
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85020503884&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(2399b9b7-ffe8-4a4f-b663-426ff04ece32).html |
Abstract
We report a strategy to realize and facilitate the photocarrier transport from mercury selenium colloidal quantum dots (HgSe CQDs) into silicon with the assistance of twisted graphene. A nanocomposite material consisting of HgSe CQDs and twisted graphene has been synthesized. By bringing the nanocomposites into contact with silicon, a HgSe CQD-twisted graphene nanocomposite/silicon junction was fabricated and demonstrated photoresponses in the long-wave infrared range. In the nanocomposites, the surface of twisted graphene was decorated with HgSe CQDs. Benefiting from the twisted structure in the nanocomposites, the active sensing area and light-matter interaction length are greatly increased. Driven by the interfacial built-in potential, photocarriers directly transfer from HgSe CQDs into the twist graphene, which serves as a fast carrier transport pathway to silicon, leading to high photocarrier collection efficiency. Compared with vertically stacked HgSe CQD film/flat graphene, the application of HgSe CQD-twisted graphene nanocomposites avoids photocarriers transporting via the hopping mechanism and over 2700% enhancement ratio of spectral responsivity was achieved, reaching 31.5 mA/W@9 μm. The interfacial energy band diagram was deduced for a better understanding of the photocarrier transfer process occurring at the interface between HgSe colloidal quantum dots, twist graphene, and silicon.
Research Area(s)
Citation Format(s)
Twisted graphene-assisted photocarrier transfer from HgSe colloidal quantum dots into silicon with enhanced collection and transport efficiency. / Tang, Xin; Wu, Guang Fu; Lai, King Wai Chiu.
In: Applied Physics Letters, Vol. 110, No. 24, 241104, 12.06.2017, p. 1-5.
In: Applied Physics Letters, Vol. 110, No. 24, 241104, 12.06.2017, p. 1-5.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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