The challenge of electrostatic chucks: Supporting the evolution of semiconductors
 from the ground up.
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The greatest feature is the lamination technology, which involves layering and firing thin ceramic sheets called green sheets. Inside the electrostatic chuck, we incorporate electrodes for adsorption, heaters, plasma electrodes, temperature sensors, and other components. Because this manufacturing method involves stacking sheets, we can precisely design the position and shape of these components. We call this strength "design flexibility."

The origin of this lamination technology lies in the ceramic IC package technology that Niterra Co., Ltd.  began manufacturing in 1967. It was about 35 years ago that we realized that this technology could be applied to large ceramic components and expanded into electrostatic chucks. Not only did we protect the fundamental technology that we had honed over many years, but the pioneering idea of transforming it into a new application has led to our current business.

As semiconductors become smaller and more integrated, higher corrosion resistance and purity are required. Therefore, we are developing high-purity ceramic materials tailored to specific applications. Another crucial element is the adhesive that connects the ceramics to the metal substrate. Because the two materials expand and contract at different rates with temperature changes, the adhesive must absorb these differences and maintain a stable bond from high to low temperatures. Having experienced situations where commercially available products could not meet our requirements, we collaborated with our group's research and development department to develop our own adhesives. The ability to consider materials, layered structures, and bonding as an integrated process supports design flexibility and reliability.

As memory becomes more multilayered and logic becomes more miniaturized, processing times increase and the load on the plasma increases. Therefore, more reliable adsorption, corrosion resistance, precise control of temperature distribution, and particle reduction are required. Furthermore, in the future, there will be a growing need to adsorb not only silicon wafers but also glass substrates that do not conduct electricity well. Here again, lamination technology that allows for the precise design of internal electrodes will prove invaluable. Moreover, electrostatic chucks are expected to be used not only in front-end processes but also in back-end processes in applications different from those previously seen. The evolution of AI is a tailwind that will broaden the areas in which we can leverage our design flexibility.

The seeds we've sown over the past five or ten years are slowly beginning to blossom. However, we must also further enhance our ability to propose the next generation of technologies, not just respond to customer requests. We want to strengthen the collaboration between our product design team, which is closest to the customer, and our new technology development team, which handles the core technologies, to anticipate future challenges and give them concrete form.

Our goal is not just to supply electrostatic chucks as a component. We want to deepen our understanding of the equipment and processes, and become a supplier that can propose the design and usage of the entire equipment, saying, "If you use this electrostatic chuck in this way, you can achieve this kind of processing." There is still much to learn, but it is worth the challenge because we are directly handling wafers and making components that affect the quality of semiconductors.

NTK CERATEC's semiconductor manufacturing equipment components business has grown significantly within the group. We aim to develop it into another flagship business, alongside automotive components, in the future. To achieve this, we will overcome challenges together with our customers, combine the group's technologies, and pioneer new markets.

A single electrostatic chuck embodies cutting-edge ceramic, processing, and bonding technologies. Knowing that this single piece we create will give rise to the next semiconductor and contribute to the future of society—that sense of exhilaration is the driving force that keeps us, as engineers, tackling this work.