Optimisation of MBE growth conditions for InAs quantum dots on (001) GaAs for 1.3 μm luminescence

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Ferdos, Fariba,1966Chalmers tekniska högskola,Chalmers University of Technology (author)

We present a study of the optimised growth conditions for InAs quantum dots (QDs) grown on GaAs substrates by solid source molecular beam epitaxy (SSMBE). Growth conditions for best luminescence intensity and linewidth were found within narrow windows of substrate temperature (500-520°C) and nominal InAs layer thickness (3.3-3.7 monolayers). The emission wavelength of such InAs QDs capped by GaAs was around 1.24 ?m. However, this is redshifted to 1.3 ?m or more by capping the InAs QDs with a thin layer of InxGa1-xAs. The results show that both In content and thickness of the capping layer can be used to tune the emission wavelength. Atomic force microscopy images show that the surface recovers to two-dimensional when depositing In0.2Ga0.8As while remaining three-dimensional when depositing In0.4Ga0.6As.

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Telekommunikation hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications hsv//eng
NATURVETENSKAP Fysik Den kondenserade materiens fysik hsv//swe
NATURAL SCIENCES Physical Sciences Condensed Matter Physics hsv//eng
semiconductor quantum dots
molecular beam epitaxial growth
spectral line intensity
semiconductor epitaxial layers
gallium arsenide
photoluminescence
semiconductor growth
III-V semiconductors
red shift
atomic force microscopy
optimisation
indium compounds
spectral line breadth

Sadeghi, Mahdad,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mahdad (author)
Zhao, Qing Xiang,1962Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)zhao (author)
Wang, Shu Min,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)shumin (author)
Larsson, Anders,1957Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)andersla (author)
Chalmers tekniska högskola (creator_code:org_t)

By the author/editor: Ferdos, Fariba, ...; Sadeghi, Mahdad, ...; Zhao, Qing Xiang ...; Wang, Shu Min, 1 ...; Larsson, Anders, ...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Telecommunicatio ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Condensed Matter ...

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