Overlay Target for Polarized Light Lithography
First Claim
1. An overlay target comprising:
- a first structure located on a first layer, the first structure being visible through a second layer; and
a second structure located on the second layer, the second structure comprising a first plurality of columns and a second plurality of columns, all oriented along a first orientation, the first plurality of columns being longer than the second plurality of columns, wherein the second plurality of columns is arranged between the first plurality of columns.
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Abstract
A target and method for use in polarized light lithography. A preferred embodiment comprises a first structure located on a reference layer, wherein the first structure is visible through a second layer, and a second structure located on the second layer, wherein the second structure is formed from a photomask containing a plurality of sub-structures oriented in a first orientation, wherein a polarized light is used to pattern the second structure onto the second layer, and wherein a polarization of the polarized light is the same as the orientation of the plurality of sub-structures. The position, size, and shape of the second structure is dependent upon a polarity of the polarized light, permitting a single design for an overlay target to be used with different polarities of polarized light.
14 Citations
20 Claims
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1. An overlay target comprising:
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a first structure located on a first layer, the first structure being visible through a second layer; and a second structure located on the second layer, the second structure comprising a first plurality of columns and a second plurality of columns, all oriented along a first orientation, the first plurality of columns being longer than the second plurality of columns, wherein the second plurality of columns is arranged between the first plurality of columns. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An overlay target comprising:
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a plurality of vertical components; and a plurality of horizontal components, wherein the plurality of vertical components surrounds the plurality of horizontal components and wherein the plurality of vertical components and the plurality of horizontal components are arranged on a same layer. - View Dependent Claims (9, 10)
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11. An overlay target for use in aligning layers of a semiconductor wafer, the overlay target comprising:
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a first structure located on a reference layer, the first structure being visible through a second layer; and a second structure located on the second layer, the second structure being formed from a photomask containing a plurality of sub-structures, all oriented along a first orientation, wherein a polarized light is used to pattern the second structure onto the second layer, and wherein a polarization of the polarized light is the same as the orientation of the plurality of sub-structures. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification