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Luminescence study of Si/Ge quantum dots
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface and Semiconductor Physics .
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2003 (English)In: Physica. E, Low-Dimensional systems and nanostructures, ISSN 1386-9477, Vol. 16, no 3-4, 476-480 p.Article in journal (Refereed) Published
Abstract [en]

We present a photoluminescence (PL) study of Ge quantum dots embedded in Si. Two different types of recombination processes related to the Ge quantum dots are observed in temperature-dependent PL measurements. The Ge dot-related luminescence peak near 0.80 eV is ascribed to the spatially indirect recombination in the type-II band lineup, while a high-energy peak near 0.85 eV has its origin in the spatially direct recombination. A transition from the spatially indirect to the spatially direct recombination is observed as the temperature is increased. The PL dependence of the excitation power shows an upshift of the Ge quantum dot emission energy with increasing excitation power density. The blueshift is ascribed to band bending at the type-II Si/Ge interface at high carrier densities. Comparison is made with results derived from measurements on uncapped samples. For these uncapped samples, no energy shifts due to excitation power or temperatures are observed in contrast to the capped samples.

Place, publisher, year, edition, pages
2003. Vol. 16, no 3-4, 476-480 p.
Keyword [en]
Yt-och halvledarfysik
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-22162DOI: 10.1016/S1386-9477(02)00652-5Local ID: 1279OAI: oai:DiVA.org:liu-22162DiVA: diva2:242475
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2011-01-13

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Larsson, MatsElfving, AndersHoltz, Per-OlofHansson, GöranNi, Wei-Xin

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Larsson, MatsElfving, AndersHoltz, Per-OlofHansson, GöranNi, Wei-Xin
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Physica. E, Low-Dimensional systems and nanostructures
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