Method of bonding wafers having vias including conductive material
First Claim
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1. A method for fabricating surface mountable integrated circuits comprising the steps of:
- providing a device wafer of monocrystalline silicon material with first and second surfaces and with integrated circuits formed on the first surface of said device wafer;
forming an oxide layer between the second surface of the device wafer and a handle wafer, said oxide layer bonding the handle wafer to the device wafer for supporting the device wafer;
forming a via in the device wafer, said via comprising a first open end on the first surface of the device wafer, an elongated passage extending from said open end a controlled depth into the handle wafer and terminating at a second end closed by said handle wafer;
depositing a conductive material in the via over the elongated surface and the closed end of the via;
removing the handle wafer to expose the conductive material coated on the via surface.
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Abstract
A surface mountable integrated circuit and a method of manufacture are disclosed. A wafer 110 has a die with an integrated circuit 119 in one surface of the wafer. A via 130 extends to the opposite surface. The via has a sidewall oxide 131 and is filled with a conductive material such as metal or doped polysilicon. The metal may comprise a barrier layer and an adhesion layer. The second end of the via can be fashioned as a prong 233 or a receptacle 430. Dies with vias can be stacked on top of each other or surface mounted to printed circuit boards or other substrate.
469 Citations
17 Claims
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1. A method for fabricating surface mountable integrated circuits comprising the steps of:
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providing a device wafer of monocrystalline silicon material with first and second surfaces and with integrated circuits formed on the first surface of said device wafer; forming an oxide layer between the second surface of the device wafer and a handle wafer, said oxide layer bonding the handle wafer to the device wafer for supporting the device wafer; forming a via in the device wafer, said via comprising a first open end on the first surface of the device wafer, an elongated passage extending from said open end a controlled depth into the handle wafer and terminating at a second end closed by said handle wafer; depositing a conductive material in the via over the elongated surface and the closed end of the via; removing the handle wafer to expose the conductive material coated on the via surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification