Temperature-dependent adsorption of Hg on CdTe(211)B studied by spectroscopic ellipsometry

Badano, G.; Chang, Y.; Garland, J. W.; Sivananthan, S.
September 2003
Applied Physics Letters;9/22/2003, Vol. 83 Issue 12, p2324
Academic Journal
The adsorption of Hg on CdTe(211)B is studied by reflective high-energy electron diffraction and by spectroscopic ellipsometry in the range of 1.8–4.1 eV. We use a Hg molecular beam to create a high equilibrium coverage of Hg on CdTe. We find that at least two types of Hg are present at the surface: A physisorbed form, which displays a Drude-type dielectric function, and a chemisorbed form, which gives rise to a dielectric function similar to that of bulk Hg[sub 1-x]Cd[sub x]Te, but with sharper structure characteristic of lower dimensionalities. The dependence of the relative amounts of these two forms of Hg on the temperature and the impinging flux is obtained from the data analysis. © 2003 American Institute of Physics.


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