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Theoretical Studies of Dark Current of Quantum Dots

Published online by Cambridge University Press:  10 February 2011

Yia-Chung Chang  and
David M. T. Kuo
Yia-Chung Chang
Affiliation:
Department of physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, Illinois, 61801
David M. T. Kuo
Affiliation:
Department of physics and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 1110 W. Green St., Urbana, Illinois, 61801
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Abstract

A time evolution method is used to compute the electron escape time and dark current of a quantum dot under electric field. We found that for quantum dots with just one bound state, the ground state wave function can be well described by the product of a 2D confined wave function in the x, y plane and a 1D confined wave function in the z direction with an effective quantum well potential. A comparison of phase-shift analysis and the full time-dependent calculation is presented. Good agreement between the two in the large time scale is found, but discrepancy exists in the small time scale. Our study shows that the electron escape rate (which determines dark current) of quantum dots is much lower than that of quantum wells with the same bound-to-continuum transition energy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 571: Symposium W – Semiconductor Quantum Dots , 1999 , 203
Copyright
Copyright © Materials Research Society 2000

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References

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