Inseto
Inseto

Knowledge Base Fact Sheet

Semiconductor Wafer Description Nomenclature (IKB-044)

This article explains the nomenclature used to identify our semiconductor wafer types and specifications, along with the key descriptive criteria to consider when choosing wafers.

Semiconductor wafer selection is key to a successful use of wafers and substrates for your process. Wafers are manufactured with very high precision, with attributes specific to the electronic and mechanical properties and any coatings applied after manufacture.

Wafers are manufactured from four main materials:

  • Silicon
  • Glass and Fused Quartz
  • 3-5 or 2-6 Compound Semiconductors
  • Sapphire

The figure below describes Inseto’s nomenclature chart for Silicon wafers:

Silicon Wafer Nomenclature
Silicon Wafer Nomenclature Chart

The second category of wafers we classify is coated wafers. These are wafers with an added layer either on both the top and bottom surfaces of the silicon or just one of the surfaces – usually the top.

The figure below shows Inseto’s nomenclature chart for Coated Wafers:

Oxide and Nitride Coated Wafer Nomenclature
Oxide and Nitride Coated Wafer Nomenclature Chart

The third category of wafers we classify is glass wafers. These are used when a transparent substrate is required and are categorised by a different set of parameters.

The figure below shows Inseto’s nomenclature chart for Glass Wafers:

Glass Wafer Nomenclature Chart
Glass Wafer Nomenclature Chart

The fourth category we use to classify our wafers is SOI wafers or Silicon-on-Insulator.

These wafers are a sandwich of silicon-insulator-silicon. The insulator is typically silicon oxide or sapphire and the make-up of these is highly specific to the end application.

The figure below shows Inseto’s nomenclature chart for SOI Wafers:

Silicon-on-Insulator SOI Wafer Nomenclature Chart
SOI (Silicon-on-Insulator) Wafer Nomenclature Chart

The fifth category we use to classify our wafers is as SOS – Silicon-on-Sapphire.

These wafers have an EPI Silicon layer on Kr grown Sapphire Wafers. The figure below shows Inseto’s nomenclature chart for SOS Wafers:

SOS Wafer Nomenclature
SOS (Silicon-on-Sapphire) Wafer Nomenclature Chart

The final category we use to classify our wafers is Sapphire.

These wafers are prime grade high quality with C, A and R plane crystal orientation from 2″ to 150mm. They are Single or double side polished have low roughness and are defect free.

The figure below shows Inseto’s nomenclature chart for Sapphire Wafers:

Sapphire Wafer Nomenclature
Sapphire Wafer Nomenclature Chart

For more information on our range of Semiconductor Wafer types, please click “HERE“.

Author

Date

Version

Author

Ian Burnett

Date

26 March 2019

Version

IKB044 Rev. 4

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