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US 4,225,408 AGranted
Process for electrolytically preparing a semiconducting film on a flexible substrate
AssigneeImperial Chemical Industries PLC
InventorsWilliam A. Barlow, Maurice Rhodes, Francis R. Sherliker, Edward W. Williams
Life of this patent
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Abstract
Electrophoresis of a colloidal suspension of a semiconducting sulphide, sulphoselenide, selenide or telluride in an aqueous medium produces a thin pin-hole-free film on a surface of a substrate. The film may be employed in solar cells.
Claims32
A method for the preparation of a substantially pin-hole-free film of thickness less than 5000 nm of a semiconducting sulphide, sulphoselenide, selenide or telluride which method comprises
- (a) preparation of the semiconductor by a metathetical reaction in water or in a mixture of water and at least one water-miscible polar organic liquid, the semiconductor being prepared in the form of a colloidal suspension of colloidal particles having an average diameter between 1 and 100 nm,
- (b) where the preparation is effected in water, addition of at least one water-miscible polar organic liquid to the colloidal suspension,
- (c) electrophoresis of the colloidal suspension to deposit the colloidal particles on a surface of a substrate, said substrate being supported on a carrier which is flexible.
A method for the preparation of a film according to claim 38 wherein the colloidal suspension contains a dopant.
Dependencies are inferred from the claim text.