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Article: Electrochemical half-reaction-assisted sub-bandgap photon sensing in a graphene hybrid phsotodetector

TitleElectrochemical half-reaction-assisted sub-bandgap photon sensing in a graphene hybrid phsotodetector
Authors
Issue Date2017
PublisherNature Publishing Group: Open Access Journals. The Journal's web site is located at http://www.nature.com/am/index.html
Citation
NPG Asia Materials, 2017, v. 9, p. e436 How to Cite?
AbstractThe photogating effect has been previously utilized to realize ultra-high photoresponsivity in a semiconductor-graphene hybrid photodetector. However, the spectral response of the graphene hybrid photodetector was limited by the bandgap of the incorporated semiconductor, which partially compromised the broadband absorption of graphene. Here, we show that this limitation can be overcome in principle by harnessing the electron-accepting ability of the electrochemical half-reaction. In our new graphene phototransistor, the electrochemical half-reaction serves as an effective reversible electron reservoir to accept the photoexcited hot electron from graphene, which promotes the sub-bandgap photosensitivity in a silver chloride (AgCl)-graphene photodetector. The photoconductive gain of ~ 3 × 109 electrons per photon in the AgCl-graphene hybrid is favored by the long lifetime of photoexcited carriers in the chemically reversible redox couple of AgCl/Ag0, enabling a significant visible light (400–600 nm) responsivity that is far beyond the band-edge absorption of AgCl. This work not only presents a new strategy to achieve an electrically tunable sub-bandgap photoresponse in semiconductor-graphene heterostructures but also provides opportunities for utilizing the electrochemical half reaction in other two-dimensional systems and optoelectronic devices.
Persistent Identifierhttp://hdl.handle.net/10722/249612
ISSN
2017 Impact Factor: 7.208
2015 SCImago Journal Rankings: 3.640
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorXiong, Z-
dc.contributor.authorChen, JW-
dc.contributor.authorWang, J-
dc.contributor.authorCai, Y-
dc.contributor.authorLiu, X-
dc.contributor.authorSu, Z-
dc.contributor.authorXu, S-
dc.contributor.authorKhan, A-
dc.contributor.authorLi, W-
dc.contributor.authorBian, JC-
dc.contributor.authorLi, G-
dc.contributor.authorHuang, M-
dc.contributor.authorTang, J-
dc.date.accessioned2017-11-21T03:04:37Z-
dc.date.available2017-11-21T03:04:37Z-
dc.date.issued2017-
dc.identifier.citationNPG Asia Materials, 2017, v. 9, p. e436-
dc.identifier.issn1884-4049-
dc.identifier.urihttp://hdl.handle.net/10722/249612-
dc.description.abstractThe photogating effect has been previously utilized to realize ultra-high photoresponsivity in a semiconductor-graphene hybrid photodetector. However, the spectral response of the graphene hybrid photodetector was limited by the bandgap of the incorporated semiconductor, which partially compromised the broadband absorption of graphene. Here, we show that this limitation can be overcome in principle by harnessing the electron-accepting ability of the electrochemical half-reaction. In our new graphene phototransistor, the electrochemical half-reaction serves as an effective reversible electron reservoir to accept the photoexcited hot electron from graphene, which promotes the sub-bandgap photosensitivity in a silver chloride (AgCl)-graphene photodetector. The photoconductive gain of ~ 3 × 109 electrons per photon in the AgCl-graphene hybrid is favored by the long lifetime of photoexcited carriers in the chemically reversible redox couple of AgCl/Ag0, enabling a significant visible light (400–600 nm) responsivity that is far beyond the band-edge absorption of AgCl. This work not only presents a new strategy to achieve an electrically tunable sub-bandgap photoresponse in semiconductor-graphene heterostructures but also provides opportunities for utilizing the electrochemical half reaction in other two-dimensional systems and optoelectronic devices.-
dc.languageeng-
dc.publisherNature Publishing Group: Open Access Journals. The Journal's web site is located at http://www.nature.com/am/index.html-
dc.relation.ispartofNPG Asia Materials-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleElectrochemical half-reaction-assisted sub-bandgap photon sensing in a graphene hybrid phsotodetector-
dc.typeArticle-
dc.identifier.emailXiong, Z: xiongze@hku.hk-
dc.identifier.emailSu, Z: suzc@hku.hk-
dc.identifier.emailXu, S: sjxu@hku.hk-
dc.identifier.emailLi, W: liwd@hku.hk-
dc.identifier.emailTang, J: jinyao@hku.hk-
dc.identifier.authorityXu, S=rp00821-
dc.identifier.authorityLi, W=rp01581-
dc.identifier.authorityTang, J=rp01677-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1038/am.2017.179-
dc.identifier.hkuros282996-
dc.identifier.volume9-
dc.identifier.spagee436-
dc.identifier.epagee436-
dc.identifier.isiWOS:000412432700002-
dc.publisher.placeJapan-

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