Views：25923
As we all know, when comparing the same area, a circular product and a square product with the same diameter or side length will have different space utilization. Generally speaking, squares allow for more efficient use of space, meaning they offer a higher utilization rate of effective space. So, why do we still use round wafers instead of square ones? The square DIEs placed on a circular WAFER inevitably lead to some wasted space. In today’s modern world, where profitability and efficiency are highly pursued, this configuration continues to be used. It makes one wonder: what is it about the circle that allows it to stand out among various shapes?
The answer lies in the production process of silicon wafers. Silicon wafers are purified, melted using the single-crystal pulling method (also known as the Czochralski process), and then sliced into thin pieces. The rotary pulling technique used in this process inherently determines the cylindrical shape of the ingot, which, in turn, dictates that wafers are circular.
However, if you take a closer look, you’ll notice that wafers aren’t perfectly round. They often feature flat grooves or V-shaped notches. These features serve an important purpose: they help identify the orientation of the wafer during subsequent manufacturing processes. Additionally, these notches mark the metallographic structure of the single-crystal growth, aiding in precise cutting and testing procedures. Interestingly, most of the material removed during this step comes from the edges, which can be seen as a form of resource reuse.
Now, let’s introduce two essential tools in semiconductor manufacturing: Dry Cabinets and N2 Cabinets. These specialized storage solutions play a critical role in maintaining the quality and integrity of wafers during production and storage. Dry Cabinets provide ultra-low humidity environments to prevent moisture contamination, while N2 Cabinets use nitrogen gas to create an inert atmosphere, protecting sensitive materials from oxidation and other forms of degradation. Together, these cabinets ensure that the meticulously crafted wafers remain in pristine condition throughout their journey from fabrication to final assembly.
In summary, the choice of circular wafers over square ones is deeply rooted in the physics and engineering of the manufacturing process. While there may be some spatial inefficiencies, the advantages of circular wafers—combined with advanced solutions like Dry Cabinets and N2 Cabinets—make them the ideal choice for achieving high-quality semiconductor products. This balance of tradition and innovation is what keeps the circular wafer at the forefront of modern technology.
