dc.contributor |
Háskólinn í Reykjavík |
dc.contributor |
Reykjavik University |
dc.contributor |
Háskóli Íslands |
dc.contributor |
University of Iceland |
dc.contributor.author |
Sultan, Muhammad Taha |
dc.contributor.author |
Maraloiu, Adrian Valentin |
dc.contributor.author |
Stavarache, Ionel |
dc.contributor.author |
Gudmundsson, Jon Tomas |
dc.contributor.author |
Manolescu, Andrei |
dc.contributor.author |
Teodorescu, Valentin Serban |
dc.contributor.author |
Ciurea, Magdalena Lidia |
dc.contributor.author |
Svavarsson, Halldor |
dc.date.accessioned |
2020-06-03T16:01:04Z |
dc.date.available |
2020-06-03T16:01:04Z |
dc.date.issued |
2019-09-17 |
dc.identifier.citation |
Sultan, M. T., Maraloiu, A. V., Stavarache, I., Gudmundsson, J. T., Manolescu, A., Teodorescu, V. S., Ciurea, M. L., & Svavarsson, H. G. (2019). Fabrication and characterization of Si1-xGex nanocrystals in as-grown and annealed structures: A comparative study. Beilstein Journal of Nanotechnology, 10, 1873–1882. https://doi.org/10.3762/bjnano.10.182 |
dc.identifier.issn |
2190-4286 |
dc.identifier.uri |
https://hdl.handle.net/20.500.11815/1874 |
dc.description |
Publisher's version (útgefin grein) |
dc.description.abstract |
Multilayer structures comprising of SiO2/SiGe/SiO2 and containing SiGe nanoparticles were obtained by depositing SiO2 layers using reactive direct current magnetron sputtering (dcMS), whereas, Si and Ge were co-sputtered using dcMS and high-power impulse magnetron sputtering (HiPIMS). The as-grown structures subsequently underwent rapid thermal annealing (550-900 degrees C for 1 min) in N-2 ambient atmosphere. The structures were investigated using X-ray diffraction, high-resolution transmission electron microscopy together with spectral photocurrent measurements, to explore structural changes and corresponding properties. It is observed that the employment of HiPIMS facilitates the formation of SiGe nanoparticles (2.1 +/- 0.8 nm) in the as-grown structure, and that presence of such nanoparticles acts as a seed for heterogeneous nucleation, which upon annealing results in the periodically arranged columnar self-assembly of SiGe core-shell nanocrystals. An increase in photocurrent intensity by more than an order of magnitude was achieved by annealing. Furthermore, a detailed discussion is provided on strain development within the structures, the consequential interface characteristics and its effect on the photocurrent spectra. |
dc.description.sponsorship |
M-ERA. NET project PhotoNanoP UEFISCDI Contract no. 33/2016, PCE project UEFISCDI Contract no. 122/2017 and by Romanian Ministry of Research and Innovation through NIMP Core Program PN19-03, contract no. 21 N/08.02.2019 and by the Technology Development Fund of the Icelandic Centre for Research, grant no. 159006-0611. |
dc.format.extent |
1873-1882 |
dc.language.iso |
en |
dc.publisher |
Beilstein Institut |
dc.relation.ispartofseries |
Beilstein Journal of Nanotechnology;10 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Electrical and Electronic Engineering |
dc.subject |
General Physics and Astronomy |
dc.subject |
General Materials Science |
dc.subject |
Grazing incidence XRD (GIXRD) |
dc.subject |
High-power impulse magnetron sputtering (HiPIMS) |
dc.subject |
HRTEM |
dc.subject |
Magnetron sputtering |
dc.subject |
Photocurrent spectra |
dc.subject |
SiGe nanocrystals |
dc.subject |
SiO2/SiGe/SiO2 multilayers |
dc.subject |
STEM-HAADF |
dc.subject |
TEM |
dc.subject |
Enhanced photoconductivity |
dc.subject |
Quantum dots |
dc.subject |
Photoluminescence |
dc.subject |
Nanoparticles |
dc.subject |
Rafeindaverkfræði |
dc.subject |
Eðlisfræði |
dc.subject |
Efnafræði |
dc.subject |
Nanótækni |
dc.subject |
Ljósfræði |
dc.subject |
Rafeindir |
dc.subject |
Smásjár |
dc.subject |
Litróf |
dc.subject |
Frumefni |
dc.subject |
Efnasambönd |
dc.subject |
Kísill |
dc.subject |
German (frumefni) |
dc.subject |
Súrefni |
dc.title |
Fabrication and characterization of Si1−xGex nanocrystals in as-grown and annealed structures: a comparative study |
dc.type |
info:eu-repo/semantics/article |
dcterms.license |
This is an Open Access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0). Please note that the reuse, redistribution and reproduction in particular requires that the authors and source are credited |
dc.description.version |
"Peer Reviewed" |
dc.identifier.journal |
Beilstein Journal of Nanotechnology |
dc.identifier.doi |
10.3762/bjnano.10.182 |
dc.contributor.department |
Verkfræðideild (HR) |
dc.contributor.department |
Department of Engineering (RU) |
dc.contributor.department |
Raunvísindastofnun (HÍ) |
dc.contributor.department |
Science Institute (UI) |
dc.contributor.school |
Tæknisvið (HR) |
dc.contributor.school |
School of Technology (RU) |
dc.contributor.school |
Verkfræði- og náttúruvísindasvið (HÍ) |
dc.contributor.school |
School of Engineering and Natural Sciences (UI) |