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Infrared Photodetectors in Heterostructure Nanowires
Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).ORCID iD: 0000-0001-5027-1456
Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
Solid State Physics and the Nanometer Consortium, Lund University, Lund, SUEDE.
Halmstad University, School of Information Science, Computer and Electrical Engineering (IDE), Halmstad Embedded and Intelligent Systems Research (EIS).
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2006 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 6, no 2, p. 229-232Article in journal (Refereed) Published
Abstract [en]

We report on spectrally resolved photocurrent measurements on single self-assembled nanowire heterostructures. The wires, typically 3 μm long with an average diameter of 85 nm, consist of InAs with a 1 μm central part of InAsP. Two different sets of wires were prepared with phosphorus contents of 15 ±3% and 35 ±3%, respectively, as determined by energy-dispersive spectroscopy measurements made in transmission electron microscopy. Ohmic contacts are fabricated to the InAs ends of the wire using e-beam lithography. The conduction band offset between the InAs and InAsP regions virtually removes the dark current through the wires at low temperature. In the optical experiments, interband excitation in the phosphorus-rich part of the wires results in a photocurrent with threshold energies of about 0.65 and 0.82 eV, respectively, in qualitative agreement with the expected band gap of the two compositions. Furthermore, a strong polarization dependence is observed with an order of magnitude larger photocurrent for light polarized parallel to the wire than for light polarized perpendicular to the wire. We believe that these wires form promising candidates as nanoscale infrared polarization-sensitive photodetectors.

Place, publisher, year, edition, pages
Washington: American Chemical Society (ACS), 2006. Vol. 6, no 2, p. 229-232
Keywords [en]
Infrared Photodetectors, Nanowires
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hh:diva-205DOI: 10.1021/nl052170lISI: 000235532700017Scopus ID: 2-s2.0-33644914252Local ID: 2082/490OAI: oai:DiVA.org:hh-205DiVA, id: diva2:237383
Available from: 2006-11-23 Created: 2006-11-23 Last updated: 2018-04-03Bibliographically approved

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Pettersson, HåkanLandin, Lars

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