Substrate recycling method and recycled substrate
First Claim
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1. A substrate recycling method, the method comprising:
- separating a substrate comprising a first surface from an epitaxial layer;
performing a first etching of the first surface using electrochemical etching; and
performing, after the first etching, a second etching of the first surface using chemical etching or dry etching, or performing, after the first etching, chemical mechanical polishing of the first surface,wherein;
the first surface comprises a sacrificial layer; and
the substrate further comprises an etching stop layer disposed under the sacrificial layer.
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Abstract
Exemplary embodiments of the present invention provide a substrate recycling method and a recycled substrate. The method includes separating a substrate having a first surface from an epitaxial layer, performing a first etching of the first surface using electrochemical etching, and performing, after the first etching, a second etching of the first surface using chemical etching, dry etching, or performing, after the first etching, chemical mechanical polishing of the first surface.
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Citations
24 Claims
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1. A substrate recycling method, the method comprising:
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separating a substrate comprising a first surface from an epitaxial layer; performing a first etching of the first surface using electrochemical etching; and performing, after the first etching, a second etching of the first surface using chemical etching or dry etching, or performing, after the first etching, chemical mechanical polishing of the first surface, wherein; the first surface comprises a sacrificial layer; and the substrate further comprises an etching stop layer disposed under the sacrificial layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A substrate recycling method, the method comprising:
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separating a substrate comprising a surface layer from an epitaxial layer; modifying the surface layer by forming pores within the surface layer; and removing the modified surface layer from the substrate, wherein the separated surface layer comprises a protrusion and a recess, the protrusion comprising a flatter surface than the recess. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification