Coating processes – Electrical product produced – Metallic compound coating
Patent
1990-03-19
1991-02-12
Morgenstern, Norman
Coating processes
Electrical product produced
Metallic compound coating
4272552, 4272551, 4272481, 427314, C23C 1600, C30B 2502
Patent
active
049923030
ABSTRACT:
In the manufacture of an electronic device, e.g. an infrared detector of cadmium mercury telluride, a gas stream (36) comprising two or more reactants is passed over a heated substrate (29) in a reaction zone (C) of a reactor vessel (1) so as to deposit material in a layer (30) on the substrate (29). One reactant, e.g. a readily decomposible cadmium alkyl (Me.sub.2 Cd), is supplied to the reaction zone (C) by means of an injection tube (b 12) which passes through a heated first zone (A) of the vessel (1). The tube (12) has a narrow bore (y) to provide a high flow velocity for this reactant (Me.sub.2 Cd) through the first zone (A). In accordance with the invention, the tube (12) widens in at least one dimension (x), towards its outlet end, so as to provide a wider outlet for injecting the reactant (Me.sub.2 Cd) into the gas stream (38,36) with a lower flow velocity which matches more closely the flow velocity of the gas stream (38,36). A more balanced mixing is achieved leading to improved compositional homogeneity in the deposited layer (30), even for difficult materials such as cadmium mercury telluride. The heated first zone (A) may comprise a capsule (2) containing e.g. a pool of mercury (3), and such a capsule (2) preferably has an outlet (a) of smaller cross-sectional area within which the widened outlet of the injection tube (12) is concentrically arranged so that the gas stream (38) is symmetrically constricted around the outlet of the injection tube (12).
REFERENCES:
patent: 3338209 (1965-10-01), Bhola
patent: 4220488 (1980-09-01), Duchemin et al.
Easton Brian C.
Maxey Christopher D.
Whiffin Peter A. C.
King Roy V.
Miller Paul R.
Morgenstern Norman
U.S. Philips Corporation
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