Assembly of silicon parts bonded together with a silicon and silica composite
First Claim
1. A joined silicon assembly, comprising:
- at least two silicon-based parts juxtaposed across respective pairs of joining areas separated by a respective gap of about 50 μ
m or more; and
a composite bridging interior portions of the gap, adhering the at least two silicon-based parts together, and comprising a plurality of silicon crystallites having at least interiors consisting essentially of silicon and embedded in a matrix of silica, where the parts are capable of being free standing when not adhered together by the composite;
wherein the diameter of the plurality of silicon crystallites is less than the size of the respective gap.
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Accused Products
Abstract
A method of joining two silicon members, the adhesive used for the method, and the joined product, especially a silicon tower for supporting multiple silicon wafers. A flowable adhesive is prepared comprising silicon particles of size less than 100 μm and preferably less than 100 nm and a silica bridging agent, such as a spin-on glass. Nano-silicon crystallites of about 20 nm size maybe formed by CVD. Larger particles maybe milled from virgin polysilicon. If necessary, a retardant such as a heavy, preferably water-insoluble alcohol such as terpineol is added to slow setting of the adhesive at room temperature. The mixture is applied to the joining areas. The silicon parts are assembled and annealed at a temperature sufficient to link the silica, preferably at 900° C. to 1100° C. for nano-silicon but higher for milled silicon.
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Citations
17 Claims
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1. A joined silicon assembly, comprising:
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at least two silicon-based parts juxtaposed across respective pairs of joining areas separated by a respective gap of about 50 μ
m or more; anda composite bridging interior portions of the gap, adhering the at least two silicon-based parts together, and comprising a plurality of silicon crystallites having at least interiors consisting essentially of silicon and embedded in a matrix of silica, where the parts are capable of being free standing when not adhered together by the composite; wherein the diameter of the plurality of silicon crystallites is less than the size of the respective gap. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A joined silicon assembly, comprising:
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at least two virgin polysilicon parts juxtaposed across a pair of joining areas separated by a gap; and a composite filled into the gap, bonding the silicon parts together, and comprising silicon particles and a silica network in which the silicon particles are dispersed, wherein the parts are capable of being free-standing when not bonded together by the composite. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification