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Room-temperature InP/InAsP Quantum Discs-in-Nanowire Infrared Photodetectors
Lund University, Sweden; Halmstad University, Sweden.
Lund University, Sweden; Halmstad University, Sweden.
Lund University, Sweden.
Lund University, Sweden.
Show others and affiliations
2017 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 6, 3356-3362 p.Article in journal (Refereed) Published
Abstract [en]

The possibility to engineer nanowire heterostructures with large bandgap variations is particularly interesting for technologically important broadband photodetector applications. Here we report on a combined study of design, fabrication, and optoelectronic properties of infrared photodetectors comprising four million n(+)in(+) InP nanowires periodically ordered in arrays. The nanowires were grown by metalorganic vapor phase epitaxy on InP substrates, with either a single or 20 InAsP quantum discs embedded in the i-segment. By Zn compensation of the residual n-dopants in the i-segment, the room-temperature dark current is strongly suppressed to a level of pA/NW at 1 V bias. The low dark current is manifested in the spectrally resolved photocurrent measurements, which reveal strong photocurrent contributions from the InAsP quantum discs at room temperature with a threshold wavelength of about 2.0 m and a bias-tunable responsivity reaching 7 A/W@1.38 m at 2 V bias. Two different processing schemes were implemented to study the effects of radial self-gating in the nanowires induced by the nanowire/SiOx/ITO wrap-gate geometry. Summarized, our results show that properly designed axial InP/InAsP nanowire heterostructures are promising candidates for broadband photodetectors.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 17, no 6, 3356-3362 p.
Keyword [en]
Nanowires; infrared photodetectors; quantum discs; disc-in-nanowire
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-139293DOI: 10.1021/acs.nanolett.6b05114ISI: 000403631600005PubMedID: 28535059OAI: oai:DiVA.org:liu-139293DiVA: diva2:1120962
Note

Funding Agencies|NanoLund; Swedish Research Council; Swedish National Board for Industrial and Technological Development; Swedish Foundation for Strategic Research; Swedish Energy Agency; Erik Johan Ljungberg Foundation; Carl Trygger Foundation; European Union [641023]

Available from: 2017-07-07 Created: 2017-07-07 Last updated: 2017-07-07

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
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More styles
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