A Study of the Au/WSe sub 2 Interface

Comparing the work functions of Au and n-type tungsten selenide a blocking contact is normally expected at the Au/n-type WSe sub 2 interface. If a Schottky contact is actually obtained when the Au electrode is deposited on an oxidized WSe sub 2 surface, it is not usually the case for a freshly cleav...

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Published in:Surface science 1992-06, Vol.273 (1-2), p.L419-L424
Main Authors: Bourezg, R, Couturier, G, Elfajri, A, Salardenne, J, Levy, F
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creator Bourezg, R
Couturier, G
Elfajri, A
Salardenne, J
Levy, F
description Comparing the work functions of Au and n-type tungsten selenide a blocking contact is normally expected at the Au/n-type WSe sub 2 interface. If a Schottky contact is actually obtained when the Au electrode is deposited on an oxidized WSe sub 2 surface, it is not usually the case for a freshly cleaved surface: the resulting contact is generally ohmic. The influence of a controlled oxide layer on the characteristics of this interface was studied. Using both results obtained in this study and those concerning the polyiodide solution/WSe sub 2 interface it is possible to improve the understanding of the WSe sub 2 surface properties and to explain the observed anomalous ohmic behavior of the interface with Au. It is finally shown that the interfacial oxide layer can be optimized to improve the efficiency of the photovoltaic cell using this interface. A 8.6% yield was obtained.
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title A Study of the Au/WSe sub 2 Interface
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