Crucible for evaporation of metallic film
First Claim
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1. An evaporation source, comprising:
- a crucible having a given depth and a given diameter, said crucible containing a volume of molten material to be evaporated;
a susceptor abutting said crucible, said susceptor being a solid columnar block, the volume of said molten material within said crucible prior to evaporation of said molten material being five eights or less of the solid volume of said susceptor; and
a conductive coil disposed about said susceptor and said crucible for coupling RF energy to said susceptor and to said crucible.
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Abstract
An evaporation source for RF heated evaporators in which the crucible has a susceptor made of a solid block of graphite carbon having a volume commensurate with the volume of molten material prior to evaporation. Moreover, the crucible has a depth that is less than twice its diameter. These features enhance the self-fractionation of the molten material prior to evaporation to thus enhance the properties of the film as-deposited.
27 Citations
13 Claims
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1. An evaporation source, comprising:
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a crucible having a given depth and a given diameter, said crucible containing a volume of molten material to be evaporated; a susceptor abutting said crucible, said susceptor being a solid columnar block, the volume of said molten material within said crucible prior to evaporation of said molten material being five eights or less of the solid volume of said susceptor; and a conductive coil disposed about said susceptor and said crucible for coupling RF energy to said susceptor and to said crucible. - View Dependent Claims (2, 3)
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4. In a metal evaporation apparatus, a RF heated source comprising:
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a RF coil; a crucible disposed within said RF coil, said crucible having a depth that is less than twice its diameter, said crucible containing a volume of molten material to be evaporated; and a susceptor abutting and supporting said crucible, said susceptor comprising a solid columnar block of material, the volume of said molten material prior to evaporation being five eights of the volume of the susceptor. - View Dependent Claims (5, 6, 7)
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8. In an evaporation apparatus, an evaporation source or promoting self-fractionation of molten material to be evaporated,
a radio frequency heating coil; -
a plurality of coaxial heat shields each having an upper edge, said shields being supported within said coil; a solid columnar susceptor block of a given volume disposed within an innermost one of said plurality of coaxial shields; a crucible disposed on and abutting said susceptor and containing a volume of molten material to be evaporated, said crucible having a depth that is less than twice its diameter, the volume of said molten material, being less than five eights of the volume of the susceptor. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification