In the process of chip processing, nitrogen plays an important role in many process links. The following are the main processes that require nitrogen in chip processing:
1. Packaging and transportation
- use in the process of chip packaging and transportation, nitrogen is used to seal the device to prevent adverse effects such as oxidation and corrosion.
- Role: Nitrogen is an inert gas with stable chemical properties and will not react with most substances. Therefore, the use of nitrogen to seal the chip can effectively protect the chip surface from oxidation and corrosion damage.
2. Drying of materials
- use: In the manufacture of microelectronic devices, optical devices and powder coatings, nitrogen is used for the drying of materials.
- Role: Nitrogen removes moisture on the surface and inside by forced air flow to ensure the dryness and purity of the material.
3. Oxidation process
- use in the production of semiconductor devices, nitrogen can be used as an oxidant for surface gas oxidation treatment.
- Role nitrogen can provide a stable and uniform environment in the oxidation process, improve the oxidation effect, and avoid the adverse effects that may be caused by the use of oxygen.
4. Purging process
- use: Used for purging the device and gas pipeline.
- Role: Nitrogen purging can ensure safety when maintaining devices that use toxic gases. Through nitrogen purging, residual gas in the pipeline can be removed to prevent danger during operation.
5. Dilution process
- use: In some processes, nitrogen is used to dilute the gas to control the reaction rate or reduce the risk.
- Role: For example, in the oxidation rate control of the thermal oxide film, nitrogen can dilute oxygen or other reactive gases to adjust the oxidation rate. In addition, nitrogen can also be used to reduce the concentration of the exhaust gas of the device to ensure safety.
6. Thin film deposition process
- use nitrogen is used as a carrier or reactive gas in thin film deposition processes such as chemical vapor deposition (CVD) and physical vapor deposition (PVD).
- Role: Nitrogen helps to form high-quality thin films, such as silicon nitride (Siover Ngo), etc. These films have excellent insulation and chemical stability, which is essential to improve the performance and reliability of semiconductor devices.
7. Create an inert environment
- use in many aspects of chip processing, nitrogen is used to create an inert environment.
- Role nitrogen can effectively eliminate oxygen and moisture in the production environment and protect sensitive semiconductor materials from oxidation and pollution. Especially in high temperature processes such as annealing, thin film growth and wafer bonding, nitrogen environment is particularly important.
8. Encapsulation Process
- use: In the chip packaging process, nitrogen is used to prevent oxidation and contamination.
- Role: Nitrogen can reduce the intrusion of oxygen and water vapor and protect packaging materials and chips. Especially in the lead-free soldering process, nitrogen is used to reduce oxidation and ensure the quality and reliability of the solder joints.
9. Temperature control
- use: In the semiconductor production process, nitrogen is also used for temperature control.
- Role: Nitrogen can help distribute heat evenly and ensure that the temperature of materials such as silicon wafers is uniform. This is very important to maintain the structural stability and electrical properties of the material.
In general, nitrogen plays an indispensable role in chip processing. It is widely used in packaging and transportation, material drying, oxidation process, purging process, dilution process, thin film deposition process, creating inert environment, packaging process and temperature control and other links.
