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What is a wafer? What is its manufacturing process?

wafer tester

1. Silicon refining and purification: First, silicon is extracted from silicon ore. Then, the silicon is purified by chemical treatment and physical methods to remove impurities and other unwanted elements.

2. Monocrystalline silicon growth: The high-purity silicon is heated and melted, and the melted silicon is gradually solidified into monocrystalline silicon under specific conditions using methods such as the Czochralski process or the Floating Zone method.

3. Wafer molding: single crystal silicon is cut into thin sheets to form round wafers. During this process, the edges of the wafer are usually removed because the edge portion cannot be used to make a complete chip.

4. Surface Cleaning: Chemical etching and surface cleaning are performed on the wafer to remove protective layers and other impurities from the surface.

5. Initial Oxidation: Thermal oxidation is used to generate a SiO2 buffer layer, which is used to reduce the subsequent stress on the wafer from the Si3N4.

6. Thermal CVD: Thermal Chemical Vapor Deposition (CVD) is used to form a thin film on the wafer. This method offers high productivity and good ladder layup.

7. Thermal treatment: Before applying photoresist, the surface of the washed substrate is treated to increase the adhesion between the photoresist and the substrate, preventing the pattern from falling off during development and side corrosion during wet etching.

8. Wafer backside grinding: after the production of integrated circuits on the front side of the wafer, in order to reduce the thermal resistance of the device, improve heat dissipation and ease of packaging, the need to thin the back side of the wafer. This process is realized by means of a lapping machine.

9. Silicon Nitride Removal: Silicon Nitride is removed using dry oxidation.

10. Ion Injection: Boron ions (B+3) are injected into the substrate through the SiO2 film by ion fabrication to form a P-trap. Ion implantation allows for precise control of low concentration impurity distribution, which is difficult to achieve with diffusion.

What does the term "probe test" signify?

A test probe serves as a tangible tool employed for interfacing electronic testing apparatuses with the device that is being examined, referred to as the device under test (DUT). These probes vary significantly in design, ranging from simplistic and sturdy constructs to intricate, sophisticated ones that command a high price tag and necessitate careful handling due to their delicate nature. Within this spectrum, specific varieties encompass test prods, oscilloscope probes, and current probes, each tailored to specific testing requirements.

What is the purpose of utilizing testers?

The tester serves as an electronic apparatus designed for verifying the passage of electrical current. Comprising of two unconnected terminals, it necessitates the placement of the specimen under examination between these extremities. In the event that the tester's indicator lights illuminate, it signifies that the material is conductive; conversely, if no illumination occurs, it indicates the material is an insulator.

Why is the implementation of vibration isolation deemed necessary?

Why Does Vibration Isolation Hold Significance? By mitigating incoming vibrational forces, vibration isolation safeguards invaluable machinery and apparatus from undue deterioration. Furthermore, it has the potential to diminish structural noise that can hinder operational efficiency, thereby enhancing profitability.

wafer tester purification Silicon Nitride