Method of making a structure comprising coating steps and corresponding structure and devices
A method of producing a structure comprising a substrate ( 11 ) having at least one integral first face at a first angle relative to a normal from the substrate, at least one second integral second face at a second angle relative to a normal from the substrate; with a cavity in the structure between the first and second faces; the method comprising the steps of: coating a portion ( 15 ) of the first face with a first conducting layer; coating a portion ( 18 ) of the second face with a second conducting layer; and depositing in the cavity an active material ( 31 ) to provide ohmic and rectifying contacts for insertion or extraction of charge from the active material by way of the first and second conducting layers. The active material may be photovoltaic, light emitting or ion conducting.
1. A roll-to-roll method of producing a structure comprising a substrate having at least one integral first face at a first angle relative to a normal from the substrate, at least one second integral second face at a second angle relative to a normal from the substrate, and a trough in the structure between the first and second faces, the roll-to-roll method comprising:
coating the first face with a first conducting layer;
coating the second face with a second conducting layer,
wherein the first conducting layer and the second conducting layer comprise different materials, and
wherein the first conducting layer is not in direct contact with the second conducting layer;
and
depositing a coating of a photovoltaic active material in the trough between the first conducting layer and second conducting layer,
wherein the coating of the photovoltaic active material is in direct contact with the first conducting layer and the second conducting layer, and
wherein the coating of the photovoltaic active material provides an ohmic contact with the first conducting layer and a rectifying contact with the second conducting layer for insertion or extraction of charge from the coating of the photovoltaic active material by way of the first and second conducting layers;
thereby producing the structure via the roll-to-roll method.
2. The method as claimed in claim 1 , wherein at least one of the first and second conducting layers is composed of or includes one or more of the following: aluminium, bismuth, cadmium, chromium, copper, gallium, gold, indium, lead, magnesium, manganese, samarium, scandium, selenium, silver, tin and zinc.
3. The method as claimed in claim 1 , wherein the photovoltaic active material is selected from one or more of the following: cadmium telluride, copper indium gallium diselenide (‘CIGS’), copper oxide, silicon, amorphous silicon, hydrogenated amorphous silicon, germanium or other semi conductor.
4. The method as claimed in claim 1 , wherein the first conducting layer has a clearly defined lower boundary.
5. The method as claimed in claim 1 , wherein the second conducting layer has a clearly defined lower boundary.
6. The method as claimed in claim 1 , wherein the substrate has a sinusoidal upper surface and a planar lower surface.
7. The method as claimed in claim 2 , wherein the first and second conducting layers are metal conductors.
8. The method as claimed in claim 3 , wherein the photovoltaic active material includes nanoparticles contacting each of the first and second conducting layers.