Method for making an electronics module having air bridge protection without large area ablation
First Claim
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1. A method for making an electronics module, comprising the steps of:
- (1) disposing a plurality of electronic chips on a substrate surface, at least some of the chips including contact pads, and at least one of the chips including a sensitive structure;
(2) encapsulating the sensitive structure with a sublimable protective layer thereby creating an encapsulating volume, the sublimable protective layer supporting the sensitive structure from all sides, and inhibiting the sensitive structure from processing contamination;
(3) applying at least one multilayer of a high density interconnect structure, comprising the steps of;
(a) applying a dielectric film layer over the chips and the substrate surface;
(b) providing a plurality of via openings in the dielectric film layer, the openings being disposed over at least some of the contact pads; and
(c) providing a pattern of electrical conductors on the film layer so that the conductors extend between the via openings so as to electrically connect selected contact pads;
(4) removing a portion of the multilayer of high density interconnect structure to provide a channel extending from the encapsulating volume through the high density interconnect structure to an exterior surface; and
(5) removing the protective layer from the encapsulating volume through the channel.
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Abstract
In a method for preserving an air bridge structure on an integrated circuit chip, without sacrificing metallization routing area in an overlying high density interconnect structure, a protective layer is sublimed over the air bridge to provide mechanical strength while preventing contamination and deformation during processing. A high density interconnect structure is applied over the chip and protective layer. A small portion of the high density interconnect structure is removed from the area over the air bridge structure, and the protective layer is then sublimed away, leaving the resultant structure with an undamaged air bridge which is free of residue.
78 Citations
11 Claims
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1. A method for making an electronics module, comprising the steps of:
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(1) disposing a plurality of electronic chips on a substrate surface, at least some of the chips including contact pads, and at least one of the chips including a sensitive structure; (2) encapsulating the sensitive structure with a sublimable protective layer thereby creating an encapsulating volume, the sublimable protective layer supporting the sensitive structure from all sides, and inhibiting the sensitive structure from processing contamination; (3) applying at least one multilayer of a high density interconnect structure, comprising the steps of; (a) applying a dielectric film layer over the chips and the substrate surface; (b) providing a plurality of via openings in the dielectric film layer, the openings being disposed over at least some of the contact pads; and (c) providing a pattern of electrical conductors on the film layer so that the conductors extend between the via openings so as to electrically connect selected contact pads; (4) removing a portion of the multilayer of high density interconnect structure to provide a channel extending from the encapsulating volume through the high density interconnect structure to an exterior surface; and (5) removing the protective layer from the encapsulating volume through the channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification