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Fabrication of genuine single-quantum-dot light-emitting diodes

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13 Author(s)
Schmidt, R. ; Institut für Technische Physik I, Friedrich-Alexander-Universität Erlangen, 91058 Erlangen, Germany ; Scholz, U. ; Vitzethum, M. ; Fix, R.
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We present a simple approach for the fabrication of genuine single quantum-dot light-emitting diodes. A submicron wide bottom contact stripe is formed by focused ion beam implantation doping into a GaAs buffer layer. Successive overgrowth with a thin intrinsic layer incorporating self-assembled InAs quantum dots, followed by a top contact layer of complementary doping type and standard photolithographic processing, allows for electrical cross sections in the sub-μm2 range. In devices with sufficiently low dot densities, only one single dot is expected to be electrically addressed. Both the observed current versus voltage characteristics and the evolution of the electroluminescence spectra as a function of applied voltage clearly demonstrate that this goal has been achieved.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 12 )

Date of Publication:

Mar 2006

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