Preparation method and application of optical glue suitable for chip image acquisition

Abstract

The invention discloses a preparation method and application of optical glue suitable for chip image acquisition. The preparation method specifically comprises the following steps: pouring deionized water into a glass beaker filled with powder polyvinyl alcohol, and then adding a defoaming agent; putting the magneton into a glass beaker, and carrying out water bath heating in a magnetic stirring water bath kettle at a certain temperature and stirring speed; the colloid in the glass beaker evaporates moisture, when a certain volume is left, the glass beaker is taken down and covered with a glass cover, and the optical glue is obtained after room temperature cooling; placing a chip to be photographed in the center of a glass slide, and using a pipette to suck optical glue and drop the optical glue on the surface of the chip; after the optical glue is self-leveled, the glass slide is placed beside an incandescent lamp, and the optical glue is baked and hardened for a certain time; and after solidification, the glass slide carrying the chip is moved to an optical microscope for image acquisition. The preparation and application method is easy to operate, and the prepared organic glue can solve the problems that the image acquisition speed is reduced, the image quality is poor and the image accuracy is poor due to the fact that the surface of a chip is uneven.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of adhesive technology, and in particular to a method for preparing optical glue suitable for chip image acquisition and its application. Background Art

[0002] In chip reverse engineering analysis, there are two ways to capture chip images: optical microscopy and scanning electron microscopy. Optical microscopy mainly captures chip overview images, metal interconnect layer images, polycrystalline layer images, and chip staining images.

[0003] However, during the chip stripping process, the selective etch rates of different materials can lead to uneven chip surfaces, which slows down image acquisition, reduces image quality, affects image accuracy, and inconveniences image analysis. Given this, it is necessary to develop an optical glue with excellent light transmittance that can improve the effectiveness and efficiency of chip image acquisition to meet the needs of chip optical image acquisition. Summary of the Invention

[0004] The present invention provides a method for preparing an optical glue suitable for chip image acquisition and its application. The method is used to prepare a highly transparent organic glue, and the glue is applied to optical image acquisition. This method can solve the problems of slow image acquisition speed, poor image quality, and lack of image accuracy caused by uneven chip surfaces, and can meet the needs of chip optical image acquisition.

[0005] The embodiment of the present invention provides a method for preparing optical glue suitable for chip image acquisition and its application, comprising the following steps: Step 1: Pour deionized water into a glass beaker containing powdered polyvinyl alcohol, and then add a certain amount of defoaming agent; Step 2: Place the magnet in a glass beaker and heat the beaker in a magnetic stirring water bath at a constant temperature and stirring speed. Step 3: When the colloid in the glass beaker evaporates and a certain volume remains, the glass beaker is removed and covered with a glass lid, and cooled at room temperature to obtain optical glue; Step 4: Place the chip to be photographed in the center of the slide and use a pipette to draw a certain volume of optical glue and drop it on the surface of the chip; Step 5: After the optical glue is self-leveled, place the slide next to an incandescent lamp to bake the optical glue into a hard film for a certain period of time; Step 6: After solidification, move the glass slide carrying the chip to an optical microscope for image acquisition.

[0006] Optionally, in step 1, the mass ratio of powdered polyvinyl alcohol to deionized water is 1:20 to 3:50.

[0007] Optionally, the defoaming agent in step 1 is octanol, and the mass ratio of powdered polyvinyl alcohol to octanol is 1:0.01 to 1:0.03.

[0008] Optionally, the water bath heating temperature in step 1 is maintained at 90°C.

[0009] Optionally, the stirring speed in step 1 is 600 rpm.

[0010] Optionally, the remaining colloid volume in step 3 is 2 / 3 of the original solution volume.

[0011] Optionally, the glass slide and the back of the chip in step 4 are clean and flat.

[0012] Optionally, in step 4, the pipette draws 0.5 mL to 1 mL of optical glue according to the size of the chip area.

[0013] Optionally, the time for baking the hard film in step 5 is 5 minutes to 10 minutes.

[0014] The beneficial effects of the present invention are: 1. The present invention provides a method for preparing polyvinyl alcohol optical glue and applies it to chip image acquisition. The preparation and application method is easy to operate and can solve the problems of slow image acquisition speed, poor image quality and lack of image accuracy caused by uneven chip surface.

[0015] 2. The optical glue prepared by the present invention has good light transmittance and fast film hardening speed, which can improve the chip image acquisition efficiency.

[0016] 3. The colloid material polyvinyl alcohol used in the present invention is not only cheap but also has very low toxicity and is environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a process flow chart of a method for preparing an optical glue suitable for chip image acquisition and its application provided by the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0019] Figure 1 This is a process flow chart of a method for preparing an optical glue suitable for chip image acquisition and its application provided by the present invention. Figure 1As can be seen, the present invention mainly includes the steps of process preparation, constant temperature water bath, magnetic stirring, glue preparation, chip glue dispensing, film baking, and image acquisition. Specifically, the process preparation of the present invention includes the following: powdered polyvinyl alcohol, deionized water, octanol, a magnetic stirring water bath, a glass beaker with a lid and scale, a glass slide, an incandescent lamp, a pipette, and an optical microscope.

[0020] Specifically, the present invention provides a method for preparing an optical glue suitable for chip image acquisition and its application, comprising the following steps: Step 1: Pour deionized water into a glass beaker containing powdered polyvinyl alcohol, and then add a certain amount of defoaming agent.

[0021] The defoaming agent is a certain mass of octanol, and the mass of the added deionized water and octanol is determined by the mass of the powdered polyvinyl alcohol. Optionally, the mass ratio of the powdered polyvinyl alcohol to deionized water is 1:20 to 3:50; and the mass ratio of the powdered polyvinyl alcohol to octanol is 1:0.01 to 1:0.03.

[0022] Step 2: Place the magnet in a glass beaker and heat the beaker in a magnetic stirring water bath at a constant temperature and stirring speed. Optionally, the temperature in this embodiment is maintained at 90° C. and the stirring speed is 600 rpm.

[0023] Step 3: When the colloid in the glass beaker evaporates and a certain volume remains, the glass beaker is removed and covered with a glass lid, and then cooled to room temperature to obtain optical glue.

[0024] Specifically, when the water in the colloid in the glass beaker evaporates to 2 / 3 of the original solution volume, remove the glass beaker and cover it with a glass lid, and cool it to room temperature to obtain optical glue; to ensure that the optical glue is used in subsequent optical image acquisition, the optical glue needs to be placed in a brown glass dropper bottle and stored in a cool, dark environment.

[0025] Step 4: Place the chip to be photographed in the center of the slide, and use a pipette to draw a certain volume of optical glue and drop it on the surface of the chip.

[0026] In this embodiment, to ensure that the captured image is not distorted, the slide and the back of the chip must be clean and flat. Depending on the size of the chip, a pipette draws 0.5 mL to 1 mL of optical glue and drops it on the chip surface.

[0027] Step 5: After the optical glue is self-leveled, place the glass slide next to an incandescent lamp to bake the optical glue into a hard film for a certain period of time.

[0028] Optionally, the baking time can be 5 to 10 minutes. To avoid excessive temperature and rapid hardening of the optical glue, which may result in incomplete coverage of the chip edge and affect the image acquisition effect, it should be avoided to place it under an incandescent lamp.

[0029] Step 6: After solidification, move the glass slide carrying the chip to an optical microscope for image acquisition. Example 1

[0030] A method for preparing optical glue suitable for chip image acquisition and its application, comprising the following steps: Step 1: Pour 150 mL of deionized water into a 300 mL glass beaker 1 containing 6 g of powdered polyvinyl alcohol, and then add 0.28 g of octanol; Step 2: Place the magnet in the glass beaker 1 and heat it in a magnetic stirring water bath, maintaining the temperature at 90° C. and stirring at 600 rpm; Step 3: When the volume of the colloid in the glass beaker 1 reaches 100 mL, remove the glass beaker 1 and cover it with a glass lid, and cool it to room temperature to obtain optical glue; Step 4: Place the 2.54mm x 1.60mm chip to be photographed in the center of the glass slide and use a pipette to drop 0.8mL of optical glue on the chip surface. Step 5: After the optical glue is self-leveled, place the slide next to an incandescent lamp to bake the optical glue into a hard film for 8 minutes; Step 6: After solidification, move the glass slide carrying the chip to an optical microscope for image acquisition. Example 2

[0031] A method for preparing optical glue suitable for chip image acquisition and its application, comprising the following steps: Step 1: Pour 150 mL of deionized water into a 300 mL glass beaker 2 containing 5.5 g of powdered polyvinyl alcohol, and then add 0.22 g of octanol; Step 2: Place the magnet in the glass beaker 2 and heat it in a magnetic stirring water bath, maintaining the temperature at 90°C and the stirring speed at 600 rpm; Step 3: When the volume of the colloid in the glass beaker 2 reaches 100 mL, remove the glass beaker 2 and cover it with a glass lid, and cool it to room temperature to obtain optical glue; Step 4: Place the chip to be photographed (1.37 mm × 0.89 mm) in the center of the glass slide and use a pipette to drop 0.5 mL of optical glue on the chip surface. Step 5: After the optical glue is self-leveled, place the glass slide next to an incandescent lamp to bake the optical glue into a hard film for 6 minutes; Step 6: After solidification, move the glass slide carrying the chip to an optical microscope for image acquisition.

[0032] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for preparing optical glue suitable for chip image acquisition and its application, characterized in that: The following steps are involved: Step 1: Pour deionized water into a glass beaker containing powdered polyvinyl alcohol, and then add a certain amount of defoaming agent; Step 2: Place the magnet in a glass beaker and heat the beaker in a magnetic stirring water bath at a constant temperature and stirring speed. Step 3: When the colloid in the glass beaker evaporates and a certain volume remains, the glass beaker is removed and covered with a glass lid, and cooled at room temperature to obtain optical glue; Step 4: Place the chip to be photographed in the center of the slide and use a pipette to draw a certain volume of optical glue and drop it on the surface of the chip; Step 5: After the optical glue is self-leveled, place the slide next to an incandescent lamp to bake the optical glue into a hard film for a certain period of time; Step 6: After solidification, move the glass slide carrying the chip to an optical microscope for image acquisition.

2. The method for preparing an optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: In step 1, the mass ratio of powdered polyvinyl alcohol to deionized water is 1:20 to 3:

50.

3. The method for preparing an optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: The defoaming agent in step 1 is octanol.

4. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 3, characterized in that: The mass ratio of the powdered polyvinyl alcohol to octanol is 1:0.01 to 1:0.

03.

5. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: In step 1, the water bath heating temperature is maintained at 90°C.

6. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: The stirring speed in step 1 is 600 rpm.

7. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: The remaining colloid volume in step 3 is 2 / 3 of the original solution volume.

8. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: The glass slide and the back of the chip in step 4 are clean and flat.

9. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: In step 4, the pipette draws 0.5 mL to 1 mL of optical glue according to the size of the chip.

10. The method for preparing optical glue suitable for chip image acquisition and its application according to claim 1, characterized in that: The time for baking the hard film in step 5 is 5 minutes to 10 minutes.

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