Journal of Electronic Materials

, Volume 39, Issue 7, pp 1023–1029

Investigation of Multicarrier Transport in LPE-Grown Hg1−xCdxTe Layers

  • G. A. Umana-Membreno
  • J. Antoszewski
  • L. Faraone
  • E. P. G. Smith
  • G. M. Venzor
  • S. M. Johnson
  • V. Phillips
Article

DOI: 10.1007/s11664-010-1086-7

Cite this article as:
Umana-Membreno, G.A., Antoszewski, J., Faraone, L. et al. Journal of Elec Materi (2010) 39: 1023. doi:10.1007/s11664-010-1086-7

Abstract

A detailed study is presented of multicarrier transport properties in liquid-phase epitaxy (LPE)-grown n-type HgCdTe films using advanced mobility spectrum analysis techniques over the temperature range from 95 K to 300 K. Three separate electron species were identified that contribute to the total conduction, and the temperature-dependent characteristics of carrier concentration and mobility were extracted for each individual carrier species. Detailed analysis allows the three observed contributions to be assigned to carriers located in the bulk long-wave infrared (LWIR) absorbing layer, the wider-gap substrate/HgCdTe transition layer, and a surface accumulation layer. The activation energy of the dominant high-mobility LWIR bulk carrier concentration in the high temperature range gives a very good fit to the Hansen and Schmit expression for intrinsic carrier concentration in HgCdTe with a bandgap of 172 meV. The mobility of these bulk electrons follows the classic μ ~ T−3/2 dependence for the phonon scattering regime. The much lower sheet densities found for the other two, lower-mobility electron species show activation energies of the order of ~20 meV, and mobilities that are only weakly dependent on temperature and consistent with expected values for the wider-bandgap transition layer and a surface accumulation layer.

Keywords

HgCdTequantitative mobility spectrum analysis (QMSA)Hall effectelectronic transportmultiple carrier transporthigh-resolution QMSAsurface accumulation

Copyright information

© TMS 2010

Authors and Affiliations

  • G. A. Umana-Membreno
    • 1
  • J. Antoszewski
    • 1
  • L. Faraone
    • 1
  • E. P. G. Smith
    • 2
  • G. M. Venzor
    • 2
  • S. M. Johnson
    • 2
  • V. Phillips
    • 3
  1. 1.School of Electrical, Electronic and Computer EngineeringThe University of Western AustraliaCrawleyAustralia
  2. 2.Raytheon Visions SystemsGoletaUSA
  3. 3.Raytheon AustraliaHendersonAustralia