Speed response analysis of an electron-transfer multiple-quantum-well waveguide modulator

Jin Wang, J. P. Leburton, J. L. Educato, J. E. Zucker

Research output: Contribution to journalArticlepeer-review


A numerical model is presented for the electronic properties of a novel InxGa1-xAs/In1-yAlyAs multiple-quantum-well waveguide modulator and a theoretical analysis of electron and hole escape mechanisms from the quantum well is developed. The influence of carriers and dopant ion charges on the band structure is simulated with a self-consistent Poisson-Schrödinger solver. The different escape mechanisms for both electrons and holes are: direct tunneling, phonon-assisted sequential tunneling, and thermionic emission. At high forward biases, the electron escape time limits the device speed, while at high reverse biases, heavy holes take a longer time than electrons for escaping the quantum well. For both particles, phonon-assisted sequential tunneling is a key mechanism in determining the device speed operation. The calculated escape times are in good agreement with the experimental data.

Original languageEnglish (US)
Pages (from-to)4669-4679
Number of pages11
JournalJournal of Applied Physics
Issue number9
StatePublished - 1993

ASJC Scopus subject areas

  • General Physics and Astronomy


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