Optimisation of MBE growth conditions for InAs quantum dots on (001) GaAs for 1.3 μm luminescence
Journal article, 2001

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.

semiconductor quantum dots

molecular beam epitaxial growth

spectral line intensity

semiconductor epitaxial layers

gallium arsenide


semiconductor growth

III-V semiconductors

red shift

atomic force microscopy


indium compounds

spectral line breadth


Fariba Ferdos

Department of Microelectronics

Mahdad Sadeghi

Department of Microelectronics

Qing Xiang Zhao

Chalmers, Physical Electronics and Photonics

Shu Min Wang

Department of Microelectronics

Anders Larsson

Department of Microelectronics

Journal of Crystal Growth

0022-0248 (ISSN)

Vol. 227-228 1140-5

Subject Categories


Condensed Matter Physics



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