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Wavelength-dependent photoconductivity of single-walled carbon nanotube layers
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0003-0368-1668
(Department of Photonics and Optical Information Technologies, ITMO University)ORCID iD: 0000-0002-6260-2694
(Department of Electronics and Nanoengineering, Aalto University)ORCID iD: 0000-0002-9546-9391
KTH, School of Electrical Engineering and Computer Science (EECS), Micro and Nanosystems.ORCID iD: 0000-0003-1443-403x
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2019 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 9, no 26, p. 14677-14682Article in journal (Refereed) Published
Abstract [en]

A number of electronic devices such as phase shifters, polarizers, modulators, and power splitters are based on tunable materials. These materials often do not meet all the requirements namely low losses, fast response time, and technological compatibility. Novel nanomaterials, such as single-walled carbon nanotubes, are therefore widely studied to fill this technological gap. Here we show how the dielectric constant of single-walled carbon nanotube layers can be substantially modified by illuminating them due to unique light–matter interactions. We relate the optical excitation of the nanotube layers to the illumination wavelength and intensity, by resistance and capacitance measurements. The dielectric constant is modified under laser illumination due to the change of material polarization and free carrier generation, and is shown to not be temperature-related. The findings indicate that SWCNT layers are a prospective tunable optoelectronic material for both high and low frequency applications.

Place, publisher, year, edition, pages
RSC Publishing, 2019. Vol. 9, no 26, p. 14677-14682
National Category
Nano Technology
Research subject
Electrical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-251605DOI: 10.1039/C9RA01467EISI: 000468641300013Scopus ID: 2-s2.0-85065863568OAI: oai:DiVA.org:kth-251605DiVA, id: diva2:1316010
Funder
EU, Horizon 2020, 675683EU, Horizon 2020, 616846
Note

QC 20190515

Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-06-20Bibliographically approved

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