Masking high-aspect aspect ratio structures
First Claim
Patent Images
1. A method of masking high-aspect ratio structures on a wafer comprising:
- submerging the wafer in a resist material so that the high-aspect ratio structures are at least partially embedded within the resist material;
curing the resist material; and
applying a further processing step to the wafer.
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Abstract
A method of masking high-aspect ratio structures on a wafer includes submerging the wafer in a resist material so that the high-aspect ratio structures are at least partially embedded within the resist material. The resist material is cured and further processing steps, such as for example oxygen plasma etching, are applied, for example to remove portions of the resist material and material from upper portions of the high-aspect ratio structures.
89 Citations
22 Claims
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1. A method of masking high-aspect ratio structures on a wafer comprising:
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submerging the wafer in a resist material so that the high-aspect ratio structures are at least partially embedded within the resist material; curing the resist material; and applying a further processing step to the wafer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of masking high-aspect ratio structures on a wafer comprising:
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spin coating the wafer with a positive photo resist material until the high-aspect ratio structures are completely embedded within the positive photo resist material, a top layer of the positive photo resist material covering upper portions of the high-aspect ratio structures; drying the positive photo resist material; exposing the top layer of the positive photo resist material; removing the top layer of the positive photo resist material using a developer solution to reveal the upper portions of the high-aspect ratio structures while remaining photo resist material covers lower portions of the high-aspect ratio structures; curing the remaining positive photo resist material; and applying a further processing step to the upper portions of the high-aspect ratio structures. - View Dependent Claims (15, 16, 17, 18)
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19. A micro-needle array comprising:
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a substrate; a plurality of needles supported by the substrate; an electrically conductive coating disposed on the plurality of needles; and an electrically insulating coating disposed over the electrically conductive coating except on deencapsulated portions of tips of the needles, the deencapsulated portions being substantially uniform in tip length. - View Dependent Claims (20, 21, 22)
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Specification