Method of obtaining anisotropic crystalline films and devices for implementation of the method
AssigneeOptiva, Inc.
InventorsPavel I. Lazarev, Victor V Nazarov, Natalya A Ovchinnikova
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Abstract
The invention pertains to the methods of obtaining anisotropic crystalline films and to devices for carrying out the methods. A colloidal system with anisometric particles is applied as a film onto the surface of a substrate while the viscosity of the colloidal system is lowered. The particles of the colloidal system with lowered viscosity are oriented and the original viscosity of the colloidal system is restored. The film is then dried. The drying is carried out under controlled conditions. Zones of the dried film may be progressively heated to improve the film characteristics.
Claims55
A method of fabricating anisotropic crystalline films comprising the steps of:
- applying a layer of a colloidal system with anisometric particles onto a substrate,
- externally impacting the colloidal system to lower the viscosity of the applied layer of the colloidal system,
- applying external orienting action on the colloidal system to provide dominant orientation of particles of the colloidal system,
- allowing the deposited colloidal system with dominant orientation of the particles to return to at least its initial value of viscosity, and
- drying the deposited layer.
A device for fabricating a crystalline film on a substrate comprising:
- a substrate holder,
- means mounted a selected distance above the substrate for applying a layer of a colloidal system with anisotropic particles of predetermined thickness onto a substrate carried by the substrate holder,
- an orienting tool for applying an orienting action on the colloidal system applied to the substrate, and
- means for heating the colloidal system applied to the substrate.
A method of fabricating anisotropic crystalline films from colloidal systems with anisometric particles comprising the steps of:
- deposition of a layer of the colloidal system onto a substrate,
- the simultaneous and/or subsequent applying of orienting action to the layer to provide dominant orientation of the particles, and
- drying the layer at a temperature in the interval 0° to 50° C. and humidity in the interval from 60 to 90% with forced slowing of the drying rate by performing the process in a finite volume, which is configured to resist deflection of solvent fumes from the surface of the forming film.
A method of fabricating anisotropic crystalline films comprising the steps of:
- applying a layer of a colloidal system with anisometric particles onto a substrate,
- externally impacting the colloidal system to lower the viscosity of the applied layer of the colloidal system.
- applying external orienting action on the colloidal system to provide dominant orientation of particles of the colloidal system,
- allowing the deposited colloidal system with dominant orientation of the particles to return to its initial value of viscosity, and
- drying the deposited layer at a temperature in the interval 0° to 50° C. and humidity in the interval from 60 to 90% with forced slowing of the drying rate by performing the process in a finite volume which is configured to resist deflection of solvent fumes from the surface of the forming film.
A method of fabricating anisotropic crystalline films from colloidal systems with anisotropic particles comprising the steps of:
- applying a layer of the colloidal system onto a substrate,
- applying external orienting action on the layer to provide primary orientation of particles of the colloidal system,
- drying of the obtained layer, and
- thermally processing the layer on the substrate surface via at least a single directional pass of the temperature zone along the layer.
A method of fabricating anisotropic crystalline films comprising the steps of:
- applying a layer of a colloidal system with anisometric particles onto a substrate,
- externally impacting the colloidal system to lower the viscosity of the applied layer of the colloidal system,
- applying external orienting action on the colloidal system to provide dominant orientation of particles of the colloidal system,
- allowing the deposited colloidal system with dominant orientation of the particles to return to its initial value of viscosity,
- drying the deposited layer at a temperature in the interval 0° to 50° C. and humidity in the interval from 60 to 90% with forced slowing of the drying rate by performing the process in a finite volume which is configured to resist deflection of solvent fumes from the surface of the forming film, and
- thermally processing the layer on the substrate surface by at least a single directional pass of a temperature zone along the layer.
A method of obtaining anisotropic crystalline films comprising the steps of:
- applying a layer of a colloidal system with anisometric particles onto a substrate,
- externally impacting the colloidal system to lower the viscosity of the applied layer of the colloidal system,
- applying external orienting action on the colloidal system to provide dominant orientation of particles of the colloidal system,
- allowing the deposited colloidal system with dominant orientation of the particles to return to its initial value of viscosity,
- drying the deposited layer, and
- thermally processing the layer on the substrate surface by at least a single directional pass of a temperature zone along the layer.
Dependencies are inferred from the claim text.