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Enhanced photocondu...
Enhanced photoconductivity of SiGe nanocrystals in SiO2 driven by mild annealing
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- Sultan, Muhammad Taha (författare)
- Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland.
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- Manolescu, Andrei (författare)
- Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland.
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- Gudmundsson, Jon Tomas, 1965- (författare)
- KTH,Rymd- och plasmafysik
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- Torfason, Kristinn (författare)
- Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland.
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- Nemnes, George Alexandru (författare)
- Univ Bucharest, Fac Phys, MDEO Res Ctr, Magurele 077125, Romania.
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- Stavarache, Ionel (författare)
- Natl Inst Mat Phys, Magurele 077125, Romania.
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- Logofatu, Constantin (författare)
- Natl Inst Mat Phys, Magurele 077125, Romania.
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- Teodoresu, Valentin Serban (författare)
- Natl Inst Mat Phys, Magurele 077125, Romania.
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- Giurea, Magdalena Lidia (författare)
- Natl Inst Mat Phys, Magurele 077125, Romania.;Acad Romanian Scientists, Bucharest 050094, Romania.
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- Svavarsson, Halldor Gudfinnur (författare)
- Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland.
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Reykjav Univ, Sch Sci & Engn, IS-101 Reykjavik, Iceland Rymd- och plasmafysik (creator_code:org_t)
- ELSEVIER SCIENCE BV, 2019
- 2019
- Engelska.
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Ingår i: Applied Surface Science. - : ELSEVIER SCIENCE BV. - 0169-4332 .- 1873-5584. ; 469, s. 870-878
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Photosensitive films based on finely dispersed semiconductor nanocrystals (NCs) in dielectric films have great potential for sensor applications. Here we report on preparation and characterization of photosensitive Si1-xGex NCs sandwiched between SiO2 matrix. A radio-frequency magnetron sputtering was applied to obtain a multilayer-structures (MLs) by depositing SiO2/SiGe/SiO2 films on Si (0 0 1) substrate. The Si1-xGex NCs were formed by a post-deposition annealing at 100-700 degrees C for 1-5 min. The effect of annealing temperature and time on MLs morphology and NCs size and density was studied using grazing incidence X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy and measurements of spectral distribution of photocurrent. It is demonstrated how the photoconductive properties of the MLs can be enhanced and tailored by controlling the NCs formation conditions and the presence of stress field in MLs and defects acting as traps and recombination centers. All these features can be adjusted/controlled by altering the annealing conditions (temperature and time). The MLs photosensitivity was increased of more than an order of magnitude by the annealing process. A mechanism, where a competition between crystallization process (NCs formation and evolution i.e. size and shapes) and stress field appearance determines the peak position in the photocurrent spectra, was identified.
Ämnesord
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Nyckelord
- SiO2
- Si1-xGex nanocrystals
- Strain
- Radio frequency magnetron sputtering
- Thermal annealing
- Photoconductivity
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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Sultan, Muhammad ...
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Manolescu, Andre ...
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Gudmundsson, Jon ...
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Torfason, Kristi ...
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Nemnes, George A ...
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Stavarache, Ione ...
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visa fler...
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Logofatu, Consta ...
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Teodoresu, Valen ...
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Giurea, Magdalen ...
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Svavarsson, Hall ...
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- Om ämnet
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- NATURVETENSKAP
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NATURVETENSKAP
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och Kemi
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och Materialkemi
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Applied Surface ...
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