Inelastic electron-polar optical phonon scattering in wide gap CdHgTe alloys

Orest P. Malyk 

Lviv Polytechnic National University, Semiconductor Electronics Department, Bandera Street, 12, Lviv 79013, Ukraine

Abstract

In [1,2] the mechanism of electron - polar optical phonon scattering in the narrow gap solid solutions CdxHg1-xTe ( 0 < x < 0.17) was considered on the basis of the short-range scattering model within the framework of a precise solution of the stationary Boltzmann equation. It allowed to achieve the coordination between the theory and experiment in the temperature range T >100K i.e. where this scattering mechanism is dominating. The purpose of the present work is to show the possibility of using of a short-range model in a case of wide gap CdxHg1-xTe solid solutions.
The short-range interaction potential of an electron with polar optical phonons is finding by the way of solution of a Poisson equation in the limits of one unit cell. Thus the unit cell is substituted by a sphere of effective radius R=γ a (a - lattice constant) the magnitude of which lies within the limits of half of the smaller diagonal up to half of the larger diagonal of a unit cell (0.5 < γ <0.866).
The calculation of the temperature dependence of electron mobility was made for compositions x = 0.52; 0.59; 1.0 . The magnitude γ for these compositions is equal 0.86 ; 0.866 ; 0.76 respectively. The calculations show that the theoretical curves well agree with the experimental data in the temperature range T > 100 K whereas the curves calculated on the basis of the standard long-range model differ from experiment in 2.5 - 4 times. It testifies that the model, offered us, adequately describe the electron-polar optical phonon scattering in the wide gap CdxHg1-xTe solid solutions.
[1]. O.P. Malyk . Inelastic electron scattering on polar optical phonons in mercury telluride. - Accepted for publication in Ukr. Phys. Zhur.
[2]. O.P. Malyk . Inelastic electron-polar optical phonon scattering in the solid solution CdxHg1-xTe. - Accepted for publication in Journal of Alloys and Compounds.

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Presentation: poster at E-MRS Fall Meeting 2004, Symposium F, by Orest P. Malyk
See On-line Journal of E-MRS Fall Meeting 2004

Submitted: 2004-04-15 13:51
Revised:   2009-06-08 12:55
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