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- Customized Nanocoating on Silicon Substrate
Silicon is a tetravalent metalloid semiconductor with a wide range of applications. It is a hard, brittle crystal with a grayish-blue metallic look. Silicon is frequently utilized in conjunction with natural minerals in the construction industry. Silicon is most well-known for its usage in the production of synthetic polymers based on polysiloxane polymers. Steelmaking, aluminum casting, and fumed silica manufacture consume the majority of ionized elemental silicon. A very little amount of high-purity silicon is used in the semiconductor electronics sector, yet it is a vital component in integrated circuits.
Alfa Chemistry provides one-of-a-kind surface coating customizing services for silicon substrates with functional surfaces that provide a variety of performance advantages in a variety of applications. You can improve the surface performance of nearly any silicon-related product with our easy-to-apply surface treatment solutions. Please feel free to collaborate with us to improve the usability of your product's surfaces!
Alfa Chemistry provides a number of surface coating technologies for semiconductor materials that can be used to functionalize the surface of silicon substrates and impart a variety of surface features. The following are some of our surface alteration technologies, but they are not exhaustive. Please contact us for more information on our technologies.
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Case 1: Anti-friction polymer composite coating
Silicon is an ideal material for microelectromechanical system production in the semiconductor sector. However, because of its brittleness and hydrophilicity, it has a lot of adhesion, which causes a lot of friction and wear. Its application in MEMS development is limited as a result. Alfa Chemistry investigated alternate self-lubricating materials for MEMS and discovered an epoxy polymer resin that met their requirements (SU-8).
We used several fillers to reinforce SU-8 to make a composite coating, then mixed them to make a hybrid composite coating. The coatings were made using solid fillers like talc and liquid fillers like perfluoropolyether (PFPE). To obtain micron-level uniform thickness, the hybrid composite coatings are coated on plasma-treated silicon wafers using spin-coating processes.
Fig 1. Surface and cross-section images of the SU-8/talc/Graphite coatings with solid fillers. (Katiyar J. K, et al. 2022)
In comparison to the original SU-8, the hybrid composite coating of SU-8/Talc/PFPE had much higher hardness and modulus of elasticity, as well as a very low coefficient of friction. The surface qualities of the SU-8 coating changed from hydrophilic to hydrophobic after blending with PFPE, according to wettability tests. Furthermore, the addition of solid and liquid fillers to SU-8 improved its thermal stability.
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