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Intersubband Quantum Disc-in-Nanowire Photodetectors with Normal-Incidence Response in the Long-Wavelength Infrared
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab. Solid State Physics and NanoLund, Lund University, Lund, Sweden. (Nanovetenskap)ORCID iD: 0000-0002-3160-8540
Solid State Physics and NanoLund, Lund University, Lund, Sweden & Sol Voltaics AB, Lund, Sweden. (Nanometerkonsortiet)
Solid State Physics and NanoLund, Lund University, Lund, Sweden.
Halmstad University, School of Information Technology, Halmstad Embedded and Intelligent Systems Research (EIS), MPE-lab. Solid State Physics and NanoLund, Lund University, Lund, Sweden. (Nanovetenskap)ORCID iD: 0000-0001-5993-8106
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2018 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 18, no 1, p. 365-372Article in journal, Letter (Refereed) Published
Abstract [en]

Semiconductor nanowires have great potential for realizing broadband photodetectors monolithically integrated with silicon. However, the spectral range of such detectors has so far been limited to selected regions in the ultraviolet, visible and near-infrared. Here, we report on the first intersubband nanowire heterostructure array photodetectors exhibiting a spectrally resolved photoresponse from the visible to long-wavelength infrared. In particular, the infrared response from 3-20 mm is enabled by intersubband transitions in low-bandgap InAsP quantum discs synthesized axially within InP nanowires. The intriguing optical characteristics, including unexpected sensitivity to normal incident radiation, are explained by excitation of the longitudinal component of optical modes in the photonic crystal formed by the nanostructured portion of the detectors. Our results provide a generalizable insight into how broadband nanowire photodetectors may be designed, and how engineered nanowire heterostructures open up new fascinating opportunities for optoelectronics.

Place, publisher, year, edition, pages
Washington: American Chemical Society (ACS), 2018. Vol. 18, no 1, p. 365-372
Keywords [en]
Nanowires, infrared photodetectors, quantum discs, intersubband photodetectors, photonic crystals
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:hh:diva-35916DOI: 10.1021/acs.nanolett.7b04217OAI: oai:DiVA.org:hh-35916DiVA, id: diva2:1168187
Available from: 2017-12-20 Created: 2017-12-20 Last updated: 2018-04-03Bibliographically approved

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Karimi, MohammadJain, VishalPettersson, Håkan

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