Silicon wafers

What is a silicon wafer?

Silicon wafers are the foundation of nearly all modern electronics. They serve as the substrate upon which integrated circuits, power devices, MEMS (microelectromechanical systems), and RF components are built. A silicon wafer is a thin, round slice of highly purified and crystallized silicon, precision-engineered to meet the demanding requirements of today’s semiconductor technologies.

At Okmetic, we specialize in manufacturing 150 mm and 200 mm silicon wafers using the Czochralski (Cz), Magnetic Czochralski (MCz) and Advanced Magnetic Czochralski (A-MCz®) crystal growth methods. Our wafers are designed to meet the highest performance, quality, and uniformity standards for advanced applications across MEMS, RF and power electronics markets.

The silicon wafer structure and manufacture explained

The process of creating a high-performance silicon wafer begins with crystal growth. At Okmetic, wafers are grown using the Czochralski (Cz), Magnetic Czochralski (MCz) or Advanced Magnetic Czochralski (A-MCz®) crystal growth methods, where a single (mono) crystal silicon ingot is pulled from high-purity molten silicon. During this process, the ingot diameter is precisely controlled, determining whether the wafers will be 150 mm or 200 mm in size.

Once the ingot has been grown, it is sliced into thin, circular discs using high-precision sawing equipment. These discs, or silicon wafers, then undergo a series of critical processing steps. Each wafer is lapped, etched, and polished to create an ultra-flat, smooth surface that meets strict specifications for thickness, flatness, and cleanliness. Final cleaning removes any microscopic particles or contaminants to ensure a pristine surface for semiconductor fabrication.

The wafer’s surface serves as a platform for building layers of electronic circuits. At the fabrication stage, semiconductor device manufacturers form transistors, capacitors, sensors, and other components through a combination of photolithography, etching, ion implantation, and thin-film deposition. The material quality, flatness, and uniformity of the silicon wafer directly influence semiconductor device performance, production yield, and long-term reliability.

At Okmetic, every wafer undergoes stringent quality control checks for thickness uniformity, flatness, defectivity, and electrical properties. Our state-of-the-art facilities and process expertise enable us to maintain tight tolerances and consistent quality across production batches. By focusing exclusively on 150 mm and 200 mm wafers grown with Cz, MCz and A-MCz® methods, Okmetic delivers materials that meet the strict demands of MEMS, RF, and power device manufacturers.

Through continuous development in crystal growth techniques and wafer processing, Okmetic ensures its wafers support innovation, reliability, and long-term performance in the global semiconductor industry.

Types of silicon wafers

Silicon wafers come in various types to meet different application needs:

Monocrystalline wafers: Produced from a single silicon crystal, offering superior electrical properties and widely used in semiconductor devices.
Polished wafers: Finished with a mirror-like surface for device fabrication. Available as single side polished (SSP) or double side polished (DSP)
Doped wafers: Silicon wafers can be doped with impurities (such as boron or phosphorus) to alter electrical conductivity, allowing the creation of p-type or n-type substrates.
Specialty wafers: These include high-resistivity, low-defect, engineered or patterned wafers for specific power, RF, or MEMS applications.
Bonded SOI (Silicon-On-Insulator) wafers: Created by bonding a thin silicon layer onto an insulating oxide layer above a silicon base wafer, SOI wafers offer superior electrical isolation, reduced parasitic capacitance, and improved device performance, particularly for MEMS, Power and RF applications.
Cavity SOI (Cavity Silicon-On-Insulator) wafers: bonded SOI wafer that has built-in sealed cavities on the handle wafer or on the buried oxide. 

At Okmetic, we provide highly customized wafers tailored to customer requirements in terms of doping, resistivity, thickness, and crystal orientation, including advanced bonded SOI wafers engineered for precision applications.

Applications of silicon wafers

Silicon wafers are the essential building blocks for a wide range of technologies, including:

MEMS and sensor devices: Critical sensing components used in automotive, medical, and consumer electronics.
Power devices: Crucial for efficient energy management in electric vehicles, renewable energy systems, and industrial equipment.
RF devices: Critical for wireless communication systems, including 4G, 5G and advanced connectivity.
Integrated Circuits (ICs): While mainstream logic and memory ICs are generally produced on 300 mm wafers not supplied by Okmetic, our wafers help support e.g. MEMS-IC integrations.

Enabling advanced applications across industries

Products made by our customers on Okmetic’s high-performance silicon wafer solutions are used in a wide range of end applications. These include smartphones, portable devices, automotive electronics, industrial process control and medical devices, the Internet of Things (IoT), as well as power supply systems and energy efficiency technologies. By enabling performance, reliability, and precision, our wafers help power the innovations that shape modern life.

What about 300 mm wafers?

While 150 mm and 200 mm silicon wafers are widely used in power, MEMS, and RF applications, the semiconductor industry also employs larger 300 mm wafers that are mainly used for high-volume digital and logic integrated circuit manufacturing.

300 mm wafers are favored in semiconductor fabs producing microprocessors, memory chips, and other high-density devices due to their ability to improve economies of scale and manufacturing efficiency.

However, the requirements for 300 mm wafers differ significantly from those for power, MEMS, and RF devices in terms of material properties and process optimization. Okmetic does not manufacture or supply 300 mm wafers. Our expertise and product portfolio focus on 150 mm and 200 mm wafers, where customization, crystal quality, and dimensional precision are critical for our customers’ device performance and yield.

Silicon wafer growth prospects

The semiconductor industry continuously evolves, driven by increasing demands for higher performance, energy efficiency, and device integration. Silicon wafer technology remains central to this progress, and growth prospects are tied to innovations in wafer quality, size, and specialized materials.

At Okmetic, we anticipate ongoing demand for 150 mm and 200 mm wafers tailored for MEMS, RF and power electronics markets, where wafer customization and material excellence are essential. Developments in crystal growth methods and process control enable improvements in defect reduction, resistivity control, and wafer uniformity, supporting next-generation device architectures.

While the 300 mm wafer segment dominates advanced digital IC manufacturing, the mid-size wafer market remains vital for analog, power, and sensor applications where Okmetic’s expertise and manufacturing focus deliver critical value to customers worldwide.
By continuously investing in advanced crystal growth technologies and quality control, Okmetic is well positioned to support the growing complexity and performance needs of semiconductor devices built on silicon wafers.