Wafer level packaging of microbolometer vacuum package assemblies
First Claim
1. A method comprising:
- providing a bolometer wafer;
providing a lid wafer;
pre-baking the bolometer wafer in at least a first ultra-high vacuum (UHV) environment in a first pre-baking module;
pre-baking the lid wafer in at least a second UHV environment in a second pre-baking module different from the first pre-baking module, wherein the pre-baking the lid wafer in the second UHV environment comprises pre-baking at a different time, temperature, and/or vacuum profile than pre-baking the bolometer wafer in the first UHV environment;
moving the bolometer wafer and lid wafer after the pre-baking to a UHV environment in a wafer alignment and bonding module;
mounting the bolometer wafer on a bolometer wafer chuck;
mounting the lid wafer on a lid wafer chuck and in facing opposition to the bolometer wafer;
baking the bolometer wafer at a first temperature using the bolometer chuck;
baking the lid wafer at a second temperature using the lid wafer chuck;
raising the respective temperatures of the bolometer wafer and the lid wafer to a common bonding temperature using the bolometer and lid wafer chucks;
clamping the bolometer wafer and the lid wafer together with a selected force, such that the wafers are bonded together in a bonded wafer pair; and
lowering the temperature of the bonded wafer pair below the common bonding temperature,wherein a vacuum environment is maintained from the pre-baking of the bolometer and lid wafers through the lowering the temperature of the bonded wafer pair.
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Accused Products
Abstract
An apparatus for the wafer level packaging (WLP) of micro-bolometer vacuum package assemblies (VPAs), in one embodiment, includes a wafer alignment and bonding chamber, a bolometer wafer chuck and a lid wafer chuck disposed within the chamber in vertically facing opposition to each other, means for creating a first ultra-high vacuum (UHV) environment within the chamber, means for heating and cooling the bolometer wafer chuck and the lid wafer chuck independently of each other, means for moving the lid wafer chuck in the vertical direction and relative to the bolometer wafer chuck, means for moving the bolometer wafer chuck translationally in two orthogonal directions in a horizontal plane and rotationally about a vertical axis normal to the horizontal plane, and means for aligning a fiducial on a bolometer wafer held by the bolometer wafer chuck with a fiducial on a lid wafer held by the lid wafer chuck.
55 Citations
10 Claims
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1. A method comprising:
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providing a bolometer wafer; providing a lid wafer; pre-baking the bolometer wafer in at least a first ultra-high vacuum (UHV) environment in a first pre-baking module; pre-baking the lid wafer in at least a second UHV environment in a second pre-baking module different from the first pre-baking module, wherein the pre-baking the lid wafer in the second UHV environment comprises pre-baking at a different time, temperature, and/or vacuum profile than pre-baking the bolometer wafer in the first UHV environment; moving the bolometer wafer and lid wafer after the pre-baking to a UHV environment in a wafer alignment and bonding module; mounting the bolometer wafer on a bolometer wafer chuck; mounting the lid wafer on a lid wafer chuck and in facing opposition to the bolometer wafer; baking the bolometer wafer at a first temperature using the bolometer chuck; baking the lid wafer at a second temperature using the lid wafer chuck; raising the respective temperatures of the bolometer wafer and the lid wafer to a common bonding temperature using the bolometer and lid wafer chucks; clamping the bolometer wafer and the lid wafer together with a selected force, such that the wafers are bonded together in a bonded wafer pair; and lowering the temperature of the bonded wafer pair below the common bonding temperature, wherein a vacuum environment is maintained from the pre-baking of the bolometer and lid wafers through the lowering the temperature of the bonded wafer pair. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification