Theoretical modeling of dark current and photo-response for quantum well and quantum dot infrared detectors

David M.T. Kuo, Angbo Fang, Y. C. Chang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Dark currents (due to direct tunneling process) and photo-response for both quantum well (QW) and quantum dot (QD) systems are calculated. A stabilization method (SM) is used to study the dynamic behavior and photo-response of an electron in an isolated QW, coupled QW or QD (with conical shape) under uniform electric field. A stabilization graph is obtained by plotting the eigenvalues of a QW or QD embedded in a confining box made of barrier material as functions of the size of the box. The eigenvalues of the system are calculated within the effective mass approximation via the Rayleigh-Ritz variational method. Density of states (DOSs) and time-dependent wave functions associated with the quasi-bound state are constructed via the SM. It is shown that the DOSs have a Lorentzian profile and the width of the Lorentzian profile gives the tunneling rate. The photo-response for QWs and conical QDs are studied and implications for device applications are discussed.

Original languageEnglish
Pages (from-to)433-442
Number of pages10
JournalInfrared Physics and Technology
Volume42
Issue number3-5
DOIs
StatePublished - Jun 2001

Keywords

  • Dark current
  • Infrared detectors
  • Photo-response
  • Quantum dots
  • Quantum wells

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