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Photocarrier escape time in quantum-well light-absorbing devices: Effects of electric field and well parameters

By V V Nikolaev and E A Avrutin

Abstract

We analyze the dependence of the carrier escape time from a single-quantum-well optoelectronic device on the aplied electric field and well width and depth. For this purpose, a new simple and computationally efficient theory is developed. This theory is accurate in the case of electrons, and the assessment of the applicability for holes is given. Semi-analytical expressions for the,escape times are derived. Calculations are compared to experimental results and previous numerical simulations. Significant correlations between the Position,of quantum-well energy levels and the value of the escape time are found. the main escape mechanism At room temperature is established to be thermally assisted tunneling/emission through near-barrier-edge states. The formation of a new eigenstate in the near-barrier-edge energy region is found to reduce the electron escape time significantly, which can be used for practical device optimization

Year: 2003
DOI identifier: 10.1109/JQE.2003.819527
OAI identifier: oai:eprints.whiterose.ac.uk:632

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