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Obtaining SiGe nanocrystallites between crystalline TiO2 layers by HiPIMS without annealing
Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0002-8153-3209
Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland..
Natl Inst Mat Phys, Magurele 077125, Romania..
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2020 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 511, article id 145552Article in journal (Refereed) Published
Abstract [en]

Formation of SiGe nanocrystals in an oxide matrix via deposition and subsequent annealing is a widely applied approach as it gives good control over optical properties by varying the Ge atomic fraction, the size, shape and crystallinity of the nanocrystals. A common drawback of annealing is a strain relaxation in the structure creating dislocations, point defects, dangling bonds, Ge clustering and altered interface morphology. All these phenomena are well-known to degrade the optoelectronic and electrical properties of the structure. As a proof of concept, in this study we have utilized a modern technique of high impulse power magnetron sputtering (HiPIMS) to obtain a crystalline TiO2/SiGe/TiO2 structure without any pre-/post-annealing. It is furthermore demonstrated how a control of the nano-crystallite size is obtained by altering the HiPIMS discharge power alone. Grazing incidence X-ray diffraction analysis was carried out for the structural characterization, while photocurrent measurements were utilized to access the role of TiO2 structural morphology over interface integrity in determining spectral feature and sensitivity. An increase of 1 - 2 orders magnitude in spectral intensity was achieved for as-grown structures fabricated via HiPIMS in comparison to annealed structure, sputtered with conventional direct current magnetron sputtering.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 511, article id 145552
Keywords [en]
TiO2, SiGe, Nanoparticles, HiPIMS, GiXRD, Interface, Photo-spectra
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-271525DOI: 10.1016/j.apsusc.2020.145552ISI: 000517883800081Scopus ID: 2-s2.0-85078996782OAI: oai:DiVA.org:kth-271525DiVA, id: diva2:1426625
Note

QC 20200427

Available from: 2020-04-27 Created: 2020-04-27 Last updated: 2020-04-27Bibliographically approved

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