Float Zone

Silicon products

We offer a comprehensive monocrystalline Float Zone and Czochralski product range

Silicon for advanced high frequency and power semiconductors

Topsil offers Float Zone and Czochralski silicon for all customer purposes – available in bulk or as prime wafers with any surface quality.

Choose from our list of standard products and request a quotation below or contact our sales team with any special request or non standard requirements.

Neutron Transmutation Doped silicon (NTD)

NTD Float Zone silicon wafers for reliable high and very high power semiconductors

Conversion of electrical energy is needed, when for instance a long-distance HVDC transmission line is terminated in a HVDC converter station, and where the DC voltage is to be transformed into AC voltage compatible with the AC grid frequency (i.e. 50 or 60 Hz). The long-distance, low loss HVDC transmission line could for instance connect an offshore wind farm and the HVDC converter station. For such applications somewhat advanced control measures and power forming possibilities are required, because the power levels being transmitted can vary a lot.


Converters that can manage highly varying power levels use voltage controlled IGBTs and diodes manufactured on 200 mm float zone wafers as the basis converter controlling and power forming components for optimum AC grid frequency adaption.

Prime Float Zone silicon (PFZ)

PFZ Float Zone silicon wafers for leading edge medium and high power semiconductors

Variable speed drives (VSD) can save up to 50% of the energy consumption of a motor drive by delivering just the right amount of power needed for the application – power-on-demand. Applications range from HVAC climate comfort controlling systems to industrial, heavy duty processing equipment. One additional benefit of variable speed drives is the noise reduction potential by operating the systems electrically.


Variable speed drives use voltage controlled IGBTs and diodes manufactured on 200 mm float zone wafers as the basis electrical switching components needed for supplying the AC power-on-demand for the motor drive.


Epitaxial wafers for high performance devices

Topsil supplies Czochralski based epitaxial (EPI)wafers for low power, medium power and special devices. The wafers are characterised by tight thickness and resistivity tolerances.


PV-FZ™ wafers for high efficiency solar cells

Recognised for their superior efficiencies above 20%, Topsil Photo voltaic float zone silicon (PV-FZ™) wafers support the development and making of high efficiency solar cells. They are available as n-type and p-type products.


Uniform High Purity silicon for silicon drift detectors

Topsil has designed a unique uniform float zone based high purity silicon substrate (UHPS) with tight resistivity tolerance performing up to unprecedented level. The substrate targets high resolution x-ray, particle and optical detectors.


High Purity Silicon primarily for detector applications

Characterised by the highest resistivity range in the market, Topsil Hyper Pure silicon (HPS) is the preferred choice for optoelectronic devices such as infrared detectors, terahertz systems, x-ray mirrors, and silicon lenses, as well as power semiconductors.


HiRes™ silicon for GHz/THz communication platforms

HiRes™ silicon is an excellent choice for a microwave substrate targeting high reliability telecommunications systems. In these systems, low loss and high performance is essential to keep signal-to-noise ratios at acceptable levels.


High Transmission Silicon for infrared applications

Topsil high transmission (HiTran™) silicon targets IR applications, such as thermal imaging systems, silicon prisms, gratings, grisms, lenses and blanks, passive filters, transmission windows for debris protection, micromachined IR devices, and silicon micro bolometers.


Silicon wafers for GaN thin film growth

Topsil offers float zone silicon wafers for GaN thin film growth based on a proprietary technology platform. The wafers  are suitable for a wide variety of microelectronic devices, such as LED applications, RF communications and power electronics.

Wafers from stock

Topsil offers a selection of different wafers directly from stock. On the e-wafers website, the current list of available wafers and their properties can be viewed.

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