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Growth and Capacitance Spectroscopy of Self Assembled Quantum Dots

Published online by Cambridge University Press:  10 February 2011

G. Medeiros-Ribeiro ,
K. H. Schmidt ,
D. Leonard ,
Y. M. Cheng  and
P. M. Petroff
G. Medeiros-Ribeiro
Affiliation:
Materials Department, University of California, Santa Barbara 93106; Quest, University of California, Santa Barbara 9310, medeiros@engrhub.ucsb.edu
K. H. Schmidt
Affiliation:
Materials Department, University of California, Santa Barbara 93106; Quest, University of California, Santa Barbara 9310, medeiros@engrhub.ucsb.edu
D. Leonard
Affiliation:
Materials Department, University of California, Santa Barbara 93106; Quest, University of California, Santa Barbara 9310, medeiros@engrhub.ucsb.edu
Y. M. Cheng
Affiliation:
Materials Department, University of California, Santa Barbara 93106; Quest, University of California, Santa Barbara 9310, medeiros@engrhub.ucsb.edu
P. M. Petroff
Affiliation:
Materials Department, University of California, Santa Barbara 93106; Quest, University of California, Santa Barbara 9310, medeiros@engrhub.ucsb.edu
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Abstract

The growth of InAs on GaAs self assembled quantum dots and their electronic properties is studied. The limit for coherent island growth is calculated with a simple model and compared to the experimentally observed values. Cross section transmission electron micrography and atomic force micrography are used to investigate this limit. The electronic properties studies involved the use of capacitance spectroscopy to map out the density of states in these structures as well as to probe the temperature dependence of the Coulomb Blockade effect in this system. It was found that Coulomb Blockade could be observed at temperatures in excess of 77K, representing an attractive approach for single electronics operating at high temperatures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 417: Symposium EE – Optoelectronic Materials-Ordering, Composition Modulation, and Self-Assembled … , 1995 , 221
Copyright
Copyright © Materials Research Society 1996

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