Wafer support and release in wafer processing
First Claim
1. A method, comprising:
- forming a sacrificial layer on a side of a wafer;
mounting the wafer onto a substrate over the sacrificial layer;
processing the wafer; and
decomposing the sacrificial layer to decouple the wafer and the substrate.
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Accused Products
Abstract
Methods and apparatuses for wafer support and release using sacrificial materials in wafer processing. In one embodiment, a solution of a sacrificial polymer is spray-coated on the wafer bump side to form a thin layer of the sacrificial polymer after solvent vaporization. An adhesive layer is then used to attach the wafer bump side onto a wafer support substrate over the sacrificial polymer to support the wafer in backside processing. After wafer thinning and backside metal deposition, the wafer is exposed to heat to thermally decompose the sacrificial polymer into gases. The decomposition of the sacrificial polymer reduces the adhesion of the adhesive layer to the bump side of the wafer such that, when the support substrate is detached from the wafer, the adhesive layer is detached together with the support substrate from the wafer bump side, leaving almost no residual traces.
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Citations
30 Claims
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1. A method, comprising:
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forming a sacrificial layer on a side of a wafer;
mounting the wafer onto a substrate over the sacrificial layer;
processing the wafer; and
decomposing the sacrificial layer to decouple the wafer and the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method, comprising:
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forming a sacrificial layer over bumps on a side of a wafer;
mounting over the sacrificial layer the side of the wafer onto a substrate;
thinning the wafer; and
thermally destructing the sacrificial layer to decouple the wafer and the substrate. - View Dependent Claims (21, 22, 23)
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24. A method, comprising:
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coating a solution of a sacrificial material over bumps on a bump side of a wafer to form a sacrificial layer after solvent vaporization;
applying an adhesive layer over the sacrificial layer to bond the wafer to a support substrate;
thinning the wafer supported by the support substrate;
exposing the wafer to heat for decomposition of the sacrificial layer, the decomposition of the sacrificial layer reducing adhesion of the adhesive layer to the wafer;
attaching the wafer, on a side opposite to the bump side of the wafer, to a tape; and
detaching the support substrate together with the adhesive layer from the wafer. - View Dependent Claims (25, 26, 27)
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28. A wafer assembly, comprising:
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a wafer, the wafer having a side;
a layer of a sacrificial material coated on the side of the wafer;
an adhesive layer coupled to the layer of the sacrificial material on the side of the wafer;
wherein the sacrificial material is capable of decomposing when heated. - View Dependent Claims (29, 30)
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Specification