Photomask detection structure and detection method thereof

Abstract

The invention relates to a photomask detection structure and a detection method thereof. The method comprises the following steps: a)providing a photomask, wherein the photomask has a chromium crystal rings array composed of mutual-isolated chromium crystal rings; b)determining a scope of an inspection area in the photomask, arranging a horizontal frame and a vertical frame at most external side in the chromium crystal ring array in the inspection area, setting as a non-inspection area; c)setting a first non-inspection area array in the photomask, covering the horizontal frame and the vertical frame in the chromium crystal ring array to form the non-inspection areal; d)arranging a second non-inspection area array in the photomask, covering a beveling frame of the chromium crystal ring in the chromium crystal ring array to form the non-inspection area. The method can ensure the largest detection area and the smallest which can be obtained, defect existence risk is reduced, and the obtained accurate detection result is more accurate.

Description

technical field [0001] The invention relates to the field of semiconductors, and in particular, the invention relates to a detection structure and a detection method of a photomask. Background technique [0002] With the continuous development of semiconductor technology, the preparation of semiconductor devices tends to be miniaturized, and has been developed to the nanometer level, while the preparation process of conventional devices is gradually mature. In the manufacturing process of semiconductor devices, the design circuit is firstly obtained by lithography imaging, and then the design pattern is precisely defined on the photomask through the manufacturing process, and the pattern on the photomask is transferred to the semiconductor substrate by using the etching process to manufacture Get the required line structure. [0003] With the continuous development of semiconductor technology, phase shift mask (Phase Shift Mask, PSM) has been widely used. PSM adopts double-...

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Problems solved by technology

[0005] After completing the preparation of the PSM, it is necessary to detect the defects of the PSM to get rid of the defects in the PSM. In the inspection of the defects, it is not necessary to detect the chromium crystal ring, so the chromium crystal ring The ring is set as a do not inspection region (DNIR), and other regions are set as inspection regions to detect the PSM. At present, there are three methods for setting the chromium crystal ring as DNIR, as follows: Figure 1a-1c shown, as Figure 1a As shown, an inspection region 11 is set in the chromium crystal ring 10, and the area of ​​the inspection region is smaller than the area of ​​the chromium crystal ring 10, so as to exclude the chromium crystal ring from the detection area, but the The problem with the method is that there is still a large part between the chromium crystal ring 10 and the inspection area that has not been detected, such as Figure 1a As shown in the area 12 filled in the upper left corner of the center, it brings great risks to the detection results; the second method is as follows Figure 1b As shown, firstly, the inspection area 11 is set on the inner side of the array of chrome crystal rings 10, so that the outermost frame of the chrome crystal rings 10 is set as DNIR, and then cutting lines are set in the array of chrome crystal rings Array, the dicing line array is a plurality of horizontal or vertical strip structures, so as to cover the horizontal and vertical frames inside the chromium crystal ring array to form a DNIR area, but the disadvantage of the method is that it cannot Set the oblique frame inside the chrome crystal ring array as the DNIR area; the third method is as attached Figure 1c As shown, wherein the method is a further improvement on the second method, specifically increasing the width of the cutting line arranged in the vertical direction so as to cover the hypotenuse of the chromium crystal ring to form a DNIR region, But the shortcoming of described method is, described kerf coverage area is too big, causes such as Figure 1c The area 12 filled in the upper left corner of the center cannot be detected, and there are similar areas in each chromium crystal ring, which brings great risk to the detection results

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