| Infrared photodetectors in heterostructure nanowires. | |
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MedLine Citation:
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PMID: 16464040 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We report on spectrally resolved photocurrent measurements on single self-assembled nanowire heterostructures. The wires, typically 3 microm long with an average diameter of 85 nm, consist of InAs with a 1 microm 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. |
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Authors:
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H Pettersson; J Trägårdh; A I Persson; L Landin; D Hessman; L Samuelson |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Nano letters Volume: 6 ISSN: 1530-6984 ISO Abbreviation: Nano Lett. Publication Date: 2006 Feb |
Date Detail:
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Created Date: 2006-02-08 Completed Date: 2006-04-28 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 101088070 Medline TA: Nano Lett Country: United States |
Other Details:
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Languages: eng Pagination: 229-32 Citation Subset: IM |
Affiliation:
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Center for Applied Mathematics and Physics, Halmstad University, Box 823, SE-301 18 Halmstad, Sweden. Hakan.Petterson@ide.hh.se |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Arsenicals
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chemistry*,
radiation effects Gold / chemistry Indium / chemistry*, radiation effects Light Nanotubes / chemistry* Particle Size Phosphorus / chemistry*, radiation effects Photochemistry Quantum Dots Sensitivity and Specificity Silicon Dioxide / chemistry Spectrophotometry, Infrared / instrumentation*, methods* Surface Properties |
| Chemical | |
Reg. No./Substance:
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0/Arsenicals; 1303-11-3/indium arsenide; 7440-57-5/Gold; 7440-74-6/Indium; 7631-86-9/Silicon Dioxide; 7723-14-0/Phosphorus |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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