Abstract:
An overlay mark set includes a substrate, a first overlay mark and a second overlay mark. The first overlay mark is disposed on the substrate for representing a first layout pattern. The second overlay mark is also disposed on the substrate for representing a second layout pattern. In particular, the first overlay mark is in direct contact with the second overlay mark.
Abstract:
A method for fabricating an overlay mark, including the steps of: forming a patterned layer on a substrate, wherein the patterned layer comprises at least one mark element forming region, wherein each mark element forming region comprises two column recesses and a plurality of row recesses, and the row recesses connect the two column recesses; growing a mark material from the sidewalls of the column recesses and the row recesses so that the mark material merges in the column recesses and the row recesses; and removing the patterned layer. Consequently, an overlay mark including mark elements with high image contrast is fabricated.
Abstract:
A wafer supporting structure for improving the critical dimension uniformity of a wafer, including: a chuck, a plurality of pin holes, and a platform positioned under the chuck. The chick has a surface and configured to receive a wafer thereon, the plurality of pin holes form through the chuck, and the platform comprises a plurality of movable pieces which support corresponding pins, wherein the pins are configured to move in a direction perpendicularly protruding from or sinking into the surface of the chuck. The movable piece has one end supporting the bottom of the pin and the other end subjected to an pneumatic pressure, hydraulic pressure, or piezoelectricity.
Abstract:
An overlay mark formed on a photomask, comprising a first rectangular region, a second rectangular region, a third rectangular region, and a fourth rectangular region, each rectangular region having the same pattern configuration, a longer side of the first rectangular region and a longer side of the third rectangular region being parallel to each other, and the first and third rectangular regions have the same first pattern configuration having a first pattern element, a longer side of the second rectangular region and a longer side of the fourth rectangular region being parallel to each other, and the second and fourth rectangular regions have the same second pattern configuration having a second pattern element, the longer side of the first rectangular region being perpendicular to the longer side of the second rectangular region; wherein, the first pattern element is different from the second pattern element for allowing the second pattern configuration be chosen to align when the first pattern configuration on the substrate was damaged during process.
Abstract:
A method of forming an overlay mark is provided. A plurality of photoresist patterns are formed on a substrate. Each of the photoresist patterns includes a first strip and a plurality of second strips arranged in parallel. The first strip crosses the second strips to form a fence shape. Further, there is a space between two adjacent photoresist patterns, and the space is fence-shaped. A plurality of islands are formed in each of the spaces to form dot type strip patterns. The photoresist patterns are removed, and the dot type strip patterns serve as the overlay mark.
Abstract:
An overlay mark formed on a photomask, comprising a first rectangular region, a second rectangular region, a third rectangular region, and a fourth rectangular region, each rectangular region having the same pattern configuration, a longer side of the first rectangular region and a longer side of the third rectangular region being parallel to each other, and a longer side of the second rectangular region and a longer side of the fourth rectangular region being parallel to each other, the longer side of the first rectangular region being perpendicular to the longer side of the second rectangular region; wherein each pattern configuration has at least two different pattern elements allowing other pattern elements be chosen to align when any one of the pattern elements on the substrate was damaged during process.
Abstract:
A mask overlay method, and a mask and a semiconductor device using the same are disclosed. According to the disclosed mask overlay technique, test marks and front layer overlay marks corresponding to a plurality of overlay mark designs are generated in a first layer of a semiconductor device. The test patterns generating the test marks each include a first sub pattern and a second sub pattern. Note that the first sub pattern has the same design as a front layer overlay pattern (which generates the front layer overlay mark corresponding thereto). Based on the test marks, performances of the plurality of overlay mark designs are graded. The front layer overlay mark corresponding to the overlay mark design having the best performance is regarded as an overlay reference for a mask of a second layer of the semiconductor device.
Abstract:
A method of forming an overlay mark is provided. A plurality of photoresist patterns are formed on a substrate. Each of the photoresist patterns includes a first strip and a plurality of second strips arranged in parallel. The first strip crosses the second strips to form a fence shape. Further, there is a space between two adjacent photoresist patterns, and the space is fence-shaped. A plurality of islands are formed in each of the spaces to form dot type strip patterns. The photoresist patterns are removed, and the dot type strip patterns serve as the overlay mark.
Abstract:
The present invention relates to a photomask and a method for forming an overlay mark in a substrate using the same. The photomask comprises a plurality of patterns. At least one of the patterns comprises a plurality of ring areas and a plurality of inner areas enclosed by the ring areas, wherein the light transmittancy of the ring areas is different from that of the inner areas. When the photomask is applied in a photolithography process, the formed overlay mark has a large thickness. Therefore, the contrast is high when a metrology process is performed, and it is easy to find the overlay mark.
Abstract:
A dynamic wafer alignment method and an exposure scanner system are provided. The exposure scanner system having a scan path, includes an exposure apparatus, an optical sensor apparatus and a wafer stage. The method comprises the steps of: (a) providing a wafer, having a plurality of shot areas, wherein each shot area has a plurality of alignment marks thereon; (b) forming a photo-resist layer on the wafer; (c) detecting the alignment marks at a portion of a shot area along the scan path by the optical sensor apparatus to obtain compensation data for wafer alignment of the portion of the shot area; (d) performing real time feedback of the compensation data for wafer alignment to the wafer stage; (e) exposing the photo-resist layer at the portion of the shot area along the scan path; (f) continuously repeating the steps (c) to (e) at the shot area along the scan path until all of the photo-resist layer at the shot area are exposed; and (g) repeating the step (f) until the photo-resist layer of all of the shot areas on the wafer are exposed.