Influence of chemical etching on metal contacts to II-VI compounds: CdTe and ZnSe

DHARMADASA, I, BLOMFIELD, C. J., GREGORY, G. E. and YOUNG, J. (1994). Influence of chemical etching on metal contacts to II-VI compounds: CdTe and ZnSe. International journal of electronics, 76 (5), 961-967.

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The chemical nature of CdTe and ZnSe surfaces prepared by various chemical treatments has been studied by X-ray photoelectron spectroscopy. It has been found that the stoichiometry of the surfaces is very sensitive to the chemical treatments and each surface shows a similar pattern. In general bromine-containing or acid-based solutions preferentially remove the semiconductor cation, leaving a semiconductor anion-rich surface. In contrast, alkaline-based systems preferentially remove the semiconductor anion to produce a semiconductor cation-rich surface. Metal contacts fabricated on these surfaces show considerable differences in current-transport properties. The stability of these metal-semiconductor contacts has also been investigated and the microscopic interactions at these interfaces studied with Auger depth profiling and secondary-ion mass spectroscopy surface imaging techniques. The influence of microscopic interactions on the macroscopic electrical properties is presented and discussed in detail.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Electronic Materials and Sensors Research Group
Identification Number:
Page Range: 961-967
Depositing User: Ann Betterton
Date Deposited: 08 Mar 2010 16:35
Last Modified: 18 Mar 2021 09:15

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