Process for the laminar joining of silicon semiconductor slices
First Claim
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1. Process for laminar joining of at least two silicon semiconductor slices, each having a front side and a back side, under the effect of heat, with microelectronic components being integrated in a recess in the front side of one of said silicon semiconductor slices, said process comprising the steps of:
- applying a first layer of aluminum to a front side of each of said silicon semiconductor slices;
applying a second layer of germanium on top of said first layer of each of said silicon semiconductor slices, said first and second layers having an overall thickness of less than 10 μ
m;
stacking said silicon semiconductor slices on top of one another with the front sides thereof facing one another;
causing said first and second layers to combine to form a eutectic alloy joining layer between said silicon semiconductor slices, by simultaneously applying heat and pressure to said silicon semiconductor slices.
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Abstract
A process for the laminar joining of two or more silicon semiconductor slices (wafers) under the effect of pressure and heat, in which a thin layer of a semiconductor-compatible material is applied to at least one of the surfaces to be joined.
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Citations
5 Claims
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1. Process for laminar joining of at least two silicon semiconductor slices, each having a front side and a back side, under the effect of heat, with microelectronic components being integrated in a recess in the front side of one of said silicon semiconductor slices, said process comprising the steps of:
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applying a first layer of aluminum to a front side of each of said silicon semiconductor slices; applying a second layer of germanium on top of said first layer of each of said silicon semiconductor slices, said first and second layers having an overall thickness of less than 10 μ
m;stacking said silicon semiconductor slices on top of one another with the front sides thereof facing one another; causing said first and second layers to combine to form a eutectic alloy joining layer between said silicon semiconductor slices, by simultaneously applying heat and pressure to said silicon semiconductor slices. - View Dependent Claims (2, 3, 4)
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5. A process for laminar joining of at least two silicon slices, at least one of which has microelectronic components arranged in a recess therein and each of which has a first layer comprising aluminum on a surface thereof and a second layer comprising germanium on top of said first layer, said process comprising the steps of:
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placing said silicon slices in contact with one another, with said first and second layers and disposed therebetween; applying a contact pressure to said silicon slices; and heating said silicon slices and layers while applying said contact pressure.
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Specification