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Cathodoluminescence study of the effect of annealing in HgI_2 vapor on the defect structure of CdTe

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Panin, G. and Piqueras de Noriega, Javier and Sochinskii, N. V. and Dieguez, E. (1996) Cathodoluminescence study of the effect of annealing in HgI_2 vapor on the defect structure of CdTe. Materials Science and Engineering B-Solid State Materials for Advanced Technology, 42 (1-mar). pp. 277-283. ISSN 0921-5107

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Official URL: http://dx.doi.org/10.1016/S0921-5107(96)01721-7


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Abstract

The origin and spatial distribution of radiative defects in undoped and Ge-doped CdTe wafers have been studied by CL spectroscopy and imaging techniques in the scanning electron microscope (SEM) before and after the wafer annealing in HgI2 vapor. The annealing procedure has been carried out under isothermal conditions at 250 degrees C for 24 h for or for 48 h. It has been shown that the annealing results in the growth of alpha-HgI2 polycrystalline layer on the wafer surface, and this layer acts as a getter for Te precipitates distributed randomly over the whole volume of the as-grown CdTe wafers. The annealing affects mainly the CL bands related with Te vacancies (band at about 1.00 eV) and Ge dopant (0.82 and 0.89 eV bands). The contribution of the latter to the total luminescence emission of CdTe wafers decreases after the annealing. The quality improvement of CdTe wafers, revealed by the elimination of Te precipitates from the wafer bulk, has been shown to be an important result of the annealing procedure.


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©1996 - Elsevier Science S.A. All rights reserved.
International Workshop on Beam Injection Assessment of Defects in Semiconductors (BIADS 96) (4. 1996. El Escorial, España).
N.V.S. and G.P. thank the fellowships from MEC (Spain). This work has been partially supported by CAM [project AE00136/94-TEC) by CICYT (project ESP 95-0148) and by DGICYT (project PB93-1256).

Uncontrolled Keywords:Cadmium Telluride, P-Cdte, Crystals, Wafers
Subjects:Sciences > Physics > Materials
ID Code:26777
Deposited On:30 Sep 2014 18:03
Last Modified:30 Sep 2014 18:03

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