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Jensen, Jens
Alternative names
Publications (10 of 54) Show all publications
Martin, D., Enlund, J., Kappertz, O. & Jensen, J. (2008). Comparing XPS and ToF-ERDA measurement of high-k dielectric materials. Journal of Physics, Conference Series, 100(1), 012036
Open this publication in new window or tab >>Comparing XPS and ToF-ERDA measurement of high-k dielectric materials
2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 100, no 1, p. 012036-Article in journal (Refereed) Published
National Category
Engineering and Technology Subatomic Physics
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111106 (URN)10.1088/1742-6596/100/1/012036 (DOI)000275655200036 ()
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Azarov, A. Y., Jensen, J., Hallen, A. & Aggerstam, T. (2008). Dopant distribution in high fluence Fe implanted GaN. Journal of Applied Physics, 104(5), 053509
Open this publication in new window or tab >>Dopant distribution in high fluence Fe implanted GaN
2008 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 104, no 5, p. 053509-Article in journal (Refereed) Published
Abstract [en]

Undoped wurtzite GaN epilayers implanted at room temperature with 50-325 keV Fe+ ions in the fluence range of 10(15)-10(17) ions/cm(2) are studied by a combination of Rutherford backscattering/channeling spectrometry and time-of-flight elastic recoil detection analysis. The results show an enhanced Fe concentration close to the surface for high ion fluences (>1 X 10(16) cm(-2)), which increases with the ion fluence. Annealing at 800 degrees C for 30 min has a negligible effect on the Fe distribution in the material bulk, but further increases the Fe concentration near the surface. Our findings can be understood by radiation enhanced diffusion during ion implantation and an increased Fe diffusivity in the near surface region with distorted stoichiometry, or formation of secondary phases and precipitates for the highest doses. The simulation shows that, if enhanced diffusion is the reason for Fe buildup at the surface, both radiation enhanced diffusion and the thermal diffusion of Fe atoms near the surface, need to be at least five times larger than ordinary bulk diffusion to explain the increased Fe surface concentration.

National Category
Other Engineering and Technologies Subatomic Physics
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-107863 (URN)10.1063/1.2975334 (DOI)000259853600039 ()
Available from: 2009-08-31 Created: 2009-08-31 Last updated: 2018-12-10Bibliographically approved
Boström, T., Jensen, J., Valizadeh, S., Westin, G. & Wäckelgård, E. (2008). ERDA of Ni-Al2O3/SiO2 solar thermal selective absorbers. Solar Energy Materials and Solar Cells, 92(10), 1177-1182
Open this publication in new window or tab >>ERDA of Ni-Al2O3/SiO2 solar thermal selective absorbers
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2008 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 92, no 10, p. 1177-1182Article in journal (Refereed) Published
Abstract [en]

Thin film materials for the use in solar thermal absorbers have been investigated using time-of-flight energy elastic recoil detection analysis (ERDA). The ERDA measurements proved to be very efficient in detecting the elemental depth composition of a selective solar absorber. The three-layer absorber is composed of an 80% nickel-20% alumina film at the base, a 40% nickel-60% alumina layer in the middle and finally an AR film of silica or hybrid-silica film at the top. The difference between solution volume percent and actual volume percent could be investigated when studying individual nickel-alumina films with varying ratios coated on glass substrates. The result showed that there was a maximum difference of 3% between the calculated solution volume percent and the actual volume percentages in the solid films. The ERDA measurements also indicate that about 15% of the nickel found in the nickel-alumina composite films is bound in the form of NiO.

Keywords
solar, absorber, selective, SEM, ToF-ERDA
National Category
Engineering and Technology Subatomic Physics
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-94902 (URN)10.1016/j.solmat.2008.02.014 (DOI)000258431300001 ()
Available from: 2006-09-29 Created: 2006-09-29 Last updated: 2018-12-10Bibliographically approved
Azarov, Y. A., Hallén, A., Jensen, J., Aggerstam, T. & Lourdudoss, S. (2008). High dose Fe implantation of GaN: damage build-up and dopant redistribution. Journal of Physics, Conference Series, 100(4), 042036
Open this publication in new window or tab >>High dose Fe implantation of GaN: damage build-up and dopant redistribution
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2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 100, no 4, p. 042036-Article in journal (Refereed) Published
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111102 (URN)10.1088/1742-6596/100/4/042036 (DOI)
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Sanz, R., Hernández-Vélez, M., Kubart, T., Martin, D. & Jensen, J. (2008). Magnetic behaviour of Fe implanted TiO2 thin films. In: Book of Abstracts: . Paper presented at IEEE International Magnetics Conference (Intermag2008). Madrid, Spain
Open this publication in new window or tab >>Magnetic behaviour of Fe implanted TiO2 thin films
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2008 (English)In: Book of Abstracts, Madrid, Spain, 2008Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Madrid, Spain: , 2008
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111108 (URN)
Conference
IEEE International Magnetics Conference (Intermag2008)
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Sanz, R., Jaafar, M., Hernández-Vélez, M., Asenjo, A., Vásquez, M., Surpi, A. & Jensen, J. (2008). Magnetic patterns induced by restricted ion irradiation through different masks. In: Book of Abstracts: . Paper presented at 20th International Conference on the Application of Accelerators in Research and Industry (CAARI2008). Forth Worth, USA
Open this publication in new window or tab >>Magnetic patterns induced by restricted ion irradiation through different masks
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2008 (English)In: Book of Abstracts, Forth Worth, USA, 2008Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Forth Worth, USA: , 2008
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111110 (URN)
Conference
20th International Conference on the Application of Accelerators in Research and Industry (CAARI2008)
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Petersson, P., Bergsåker, H., Hallén, A., Jensen, J. & Possnert, G. (2008). Mapping of hydrogen isotopes with a scanning nuclear microprobe. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 266(10), 2429-2432
Open this publication in new window or tab >>Mapping of hydrogen isotopes with a scanning nuclear microprobe
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2008 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, E-ISSN 1872-9584, Vol. 266, no 10, p. 2429-2432Article in journal (Refereed) Published
Abstract [en]

Elastic recoil detection analysis using heavy ions with a scanning nuclear microprobe was applied to determine the content of hydrogen isotopes in carbon material facing fusion plasma in the JET fusion reactor. The hydrogen and deuterium concentrations in re-deposited material were obtained by mapping a cross sectional cut of a wall sample. De-trapping and hydrogen release caused by the primary ion beam were investigated. For both the deuterium and hydrogen concentration a drop of similar to 75% was observed from an extrapolated initial value to a final steady state region. A procedure was used to determine the initial concentration. In this way a mapping of the initial deuterium concentration could be obtained.

National Category
Physical Sciences Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111087 (URN)10.1016/j.nimb.2008.03.059 (DOI)000257185600075 ()
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Petersson, P., Jensen, J., Hallén, A. & Possnert, G. (2008). Measurement of hydrogen isotopes by nuclear microprobe. Journal of Physics, Conference Series, 100(6), 062029
Open this publication in new window or tab >>Measurement of hydrogen isotopes by nuclear microprobe
2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 100, no 6, p. 062029-Article in journal (Refereed) Published
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111090 (URN)10.1088/1742-6596/100/6/062029 (DOI)000275655200225 ()
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Vuckovic, S., Popok, V. N. & Jensen, J. (2008). Nanostructure formation on rutile TiO2 surfaces by low-energy cluster and high-energy ion impact. In: Book of Abstracts: . Paper presented at 16th International Conference on Ion Beam Modification of Material (IBMM-2008). Dresden, Germany
Open this publication in new window or tab >>Nanostructure formation on rutile TiO2 surfaces by low-energy cluster and high-energy ion impact
2008 (English)In: Book of Abstracts, Dresden, Germany, 2008Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Dresden, Germany: , 2008
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111114 (URN)
Conference
16th International Conference on Ion Beam Modification of Material (IBMM-2008)
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
Svensk, O., Törmä, P. T., Suihkonen, S., Ali, M., Lipsanen, H., Sopanen, M., . . . Hjort, K. (2008). Reduced photoluminescence from InGaN/GaN multiple quantum well structures irradiated by low fluence high energy heavy ions. In: Book of Abstracts: . Paper presented at 23rd International Conference on Atomic Collisions in Solids (ICACS-23). Phalaborwa, South Africa
Open this publication in new window or tab >>Reduced photoluminescence from InGaN/GaN multiple quantum well structures irradiated by low fluence high energy heavy ions
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2008 (English)In: Book of Abstracts, Phalaborwa, South Africa, 2008Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Phalaborwa, South Africa: , 2008
National Category
Subatomic Physics Engineering and Technology
Research subject
Ion Physics
Identifiers
urn:nbn:se:uu:diva-111112 (URN)
Conference
23rd International Conference on Atomic Collisions in Solids (ICACS-23)
Available from: 2009-12-03 Created: 2009-12-03 Last updated: 2018-12-10Bibliographically approved
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