Carbon film oxidation for free-standing film formation
First Claim
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1. A process for fabricating a free-standing sheet of silicon which comprises the steps of:
- providing a refractory substrate having a surface;
forming a pyrolytic carbon layer overlying said surface by heating said surface and decomposing a hydrocarbon thereon;
depositing a layer of silicon overlying said carbon layer;
providing an edge at which said carbon layer is exposed; and
separating said layer of silicon from said substrate by heating in an oxygen ambient to oxidize said carbon layer from beneath said layer of silicon.
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Abstract
A process is disclosed for fabricating a free-standing thin or thick film structure. One embodiment of the process includes the steps of providing a substrate of a first refractory material, forming a layer of carbon on the substrate, and depositing a film of a second refractory material on top of the layer of carbon. This sandwich structure is heated in an oxidizing ambient to cause the oxidation of the carbon layer leaving the second refractory material as a free-standing film.
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17 Claims
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1. A process for fabricating a free-standing sheet of silicon which comprises the steps of:
- providing a refractory substrate having a surface;
forming a pyrolytic carbon layer overlying said surface by heating said surface and decomposing a hydrocarbon thereon;
depositing a layer of silicon overlying said carbon layer;
providing an edge at which said carbon layer is exposed; and
separating said layer of silicon from said substrate by heating in an oxygen ambient to oxidize said carbon layer from beneath said layer of silicon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- providing a refractory substrate having a surface;
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11. A process for fabricating a free-standing sheet of refractory material which comprises the steps of:
- providing a substrate of a first refractory material;
forming a layer of barrier material overlying said first refractory material;
forming a pyrolytic carbon layer overlying said layer of barrier material;
depositing a layer of a second refractory material overlying said pyrolytic carbon layer;
providing an edge at which said carbon layer is exposed; and
separating said layer of a second refractory material from the underlying layer by heating in an oxidizing ambient to oxidize said carbon layer. - View Dependent Claims (12, 13, 14, 15, 16)
- providing a substrate of a first refractory material;
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17. A process for fabricating a free-standing sheet of refractory material which comprises the steps of:
- providing a substrate of a first refractory material;
forming a pyrolytic carbon layer overlying said substrate;
forming a layer of a barrier material overlying said pyrolytic carbon layer;
depositing a layer of a second refractory material overlying said layer of a barrier material;
providing an edge at which said carbon layer is exposed; and
separating said layer of a second refractory material from the underlying layer by heating in an oxidizing ambient to oxidize said carbon layer.
- providing a substrate of a first refractory material;
Specification