Wafer alignment and bonding
First Claim
1. A method for alignment of at least two wafers comprising,a) placing said wafers in closely spaced face-to-face opposition, which faces have been hydrophilically treated,b) deflecting one wafer into contact with the other at least at an interior portion thereof, while holding the remainders of said wafers apart, by exterior pulling means, to partially bond the wafer pair andc) releasing said remainders so as to permit a contact bonding wave to spread from said interior portion to the wafer edges to adhere said wafers to each other in a full bond.
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Accused Products
Abstract
Provided is a method and apparatus for close alignment of two or more electrically conductive wafers which are positioned face-to-face in closely spaced opposition, the wafers having position marks on corresponding portions thereof, the wafers being aligned as to their mating components, as guided by optically comparing the alignment of the respective position marks; deflecting an interior portion of one of the wafers into contact with the other wafer, to partially bond the wafers to each other, then fully contacting and bonding the rest of the wafer pair and then optically checking the resulting wafer alignment to see if same is acceptable.
57 Citations
14 Claims
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1. A method for alignment of at least two wafers comprising,
a) placing said wafers in closely spaced face-to-face opposition, which faces have been hydrophilically treated, b) deflecting one wafer into contact with the other at least at an interior portion thereof, while holding the remainders of said wafers apart, by exterior pulling means, to partially bond the wafer pair and c) releasing said remainders so as to permit a contact bonding wave to spread from said interior portion to the wafer edges to adhere said wafers to each other in a full bond.
Specification