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The pre-diffusion cleaning process removes organic matter, silica layers, particles and metals, protecting the regenerated oxide!
Category:
Process Technology
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Release time:
2021-11-12
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In the cleaning process before diffusion, the removal of organic matter, silicon dioxide layer, particles and metals are crucial steps, and the protection of regenerated oxide is also an indispensable part. This cleaning process is critical to ensure the quality and performance of semiconductor devices.
First, the removal of organic matter is the first task of the cleaning process. Organic matter may come from various sources of contamination in the manufacturing process, such as solvents, grease, etc. If these organic matter are not completely removed, they will have an adverse effect on subsequent process steps and even cause device failure. Therefore, specific cleaning agents and process conditions are required to effectively remove these organic matter.
Secondly, the removal of the silicon dioxide layer is also an important step in the cleaning process. The silicon dioxide layer may be formed on the surface of the semiconductor for various reasons, and its presence will affect the electrical properties and stability of the device. Therefore, it is necessary to remove this layer of silicon dioxide by chemical or physical methods, such as pickling or plasma etching.
The removal of particles is equally important. Particles may include tiny substances such as dust and debris, which may adhere to the surface of the semiconductor and affect the performance and reliability of the device. These particles can be effectively removed through delicate cleaning steps, such as ultrasonic cleaning or high-pressure spraying.
As for the removal of metal, this is to prevent the influence of metal impurities on the performance of semiconductors. Metal impurities may cause short circuits or leakage of devices, so they must be thoroughly removed before diffusion. This usually requires the use of cleaning agents containing specific complexing agents to remove metal ions from the surface of semiconductors.
During the cleaning process, it is equally important to protect the regenerated oxide. Regenerated oxide plays a key role in the performance and stability of semiconductor devices, so special protective measures need to be taken during the cleaning process, such as using low concentrations of cleaning agents, controlling cleaning time and temperature, etc., to prevent damage to the regenerated oxide.
In summary, the cleaning process before diffusion is a complex and delicate process that requires comprehensive consideration of removing organic matter, silicon dioxide layers, particles and metals while protecting the regenerated oxide. Through scientific cleaning methods and strict process control, the quality and performance of semiconductor devices can be ensured to be optimal.
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