PI-KEM can offer a variety of surface finishes to support research and production requirements
Many applications, including semiconductor, sensor, and micro-electronic device manufacture, require wafers to have exact specifications, with tight tolerances, for flatness and thickness to ensure they work reliably and perform well. By polishing the wafers, these requirements can be achieved. Wafer polishing uses an abrasive slurry and specialist equipment to remove a thin layer from the surface of the wafer.
Polishing can be single sided (SSP) or double sided (DSP) and involves removing up to 10 microns from the wafer surface.
- Reduces thickness
- Reduces stress points caused by flaws developed during boule growth or wafer preparation so decreasing the chance of breakages
- Prevents warping, as strength and flexibility are increased.
- Produces a more enhanced wafer with a super smooth, uniform crystal surface for epitaxial thin film growth
- Prepares them for future processing. By reducing the number of defective devices, a higher yield can be achieved
These wafers are sliced from the raw silicon ingot before any other process is carried out. Their surfaces are rough and non-reflective. As-cut wafers can be used for basic research that does not require a highly finished surface or bought by manufacturers to process to their own specifications.
PI-KEM can offer up to 6” or 150mm diameter as cut/ sawn wafers.
Lapping allows the production of wafers with a flat, smooth surface and tight tolerances of thickness, parallelism, flatness, or finish. By treating the wafer surface with a slurry and moving it over a lapping pad it gains a flat, matte, dull grey surface. These wafers can be used as is or be further processed with polishing.
Etched wafers are commonly used as the base for microelectronic devices. Etching can be carried out by wet or dry etching, both result in the removal of unwanted contaminants from the surface of the wafer.
PI-KEM can supply etched wafers to customers individual specifications. We also supply the Cheersonic coaters which enable customers to deposit their own photoresist and other coatings. Click here find out more about the Cheersonic equipment, or watch the video here.