Semiconductor Wafers: Substrates for IC Fabrication

Q: What are the standard wafer diameters?

Standard diameters include 100 mm, 150 mm, 200 mm, and 300 mm, as listed in SEMI M1. 450 mm is also referenced but not yet widely used.

Q: How is wafer flatness specified?

Flatness is specified as SFQR (Site Flatness, least squares) with a maximum deviation of ≤0.5 μm, per SEMI M1. This is critical for photolithography depth of focus.

Q: What standards apply to semiconductor wafers?

Key standards include SEMI M1 for dimensions, SEMI MF84 for resistivity, SEMI MF1810 for surface roughness, and ASTM F121 for oxygen content. Always verify compliance with the supplier.

Product Specifications

Technical details and manufacturing context for Semiconductor Wafers

Definition

Semiconductor wafers are ultra-pure, precisely engineered thin discs of semiconductor materials, primarily silicon, that serve as the foundational substrate for manufacturing integrated circuits (ICs), microelectromechanical systems (MEMS), and other semiconductor devices. They are produced through crystal growth, slicing, lapping, polishing, and cleaning processes to achieve exceptional surface flatness, purity, and crystallographic perfection. The wafer provides the mechanical support and electrical properties necessary for the micro-fabrication of electronic components. Common materials include silicon, gallium arsenide, and silicon carbide. Key parameters include diameter (100, 150, 200, 300 mm), thickness (525–925 μm), surface orientation (<100>, <111>, <110>), resistivity (0.001–100 Ω·cm), total thickness variation (≤5 μm), surface roughness (≤0.5 nm), bow/warp (≤30 μm), edge profile (rounded, beveled), flatness (≤0.5 μm), heavy metal contamination (<1E10 atoms/cm²), oxygen content (10–30 ppma), operating temperature range (-40–150 °C), and weight (~125 g for 300 mm). These values are reference ranges per SEMI M1, SEMI MF84, SEMI MF1810, and ASTM F121 standards; actual specifications must be confirmed with the supplier. The wafer's crystalline structure and purity are critical for device performance and yield. Selection depends on the intended device type, process technology, and required electrical characteristics. Verification of parameters such as resistivity, flatness, and contamination levels is essential before use. Maintenance involves proper handling and storage to prevent contamination and mechanical damage. Failure modes include wafer breakage, warpage, and contamination, which can lead to device defects.

Working Principle

Semiconductor wafers function as the base material upon which electronic circuits are built. Through photolithography, doping, deposition, and etching processes, multiple layers of transistors, interconnects, and insulating materials are patterned onto the wafer surface. The wafer provides the necessary crystalline structure and electrical properties for these micro-fabricated components to function as designed. The wafer's crystal orientation influences the electrical behavior of devices, while its flatness and surface quality are critical for precise patterning. The wafer also acts as a mechanical support during processing and as a heat sink during operation. The fabrication process relies on the wafer's uniformity and purity to achieve high yields and consistent performance.

Common Materials

Silicon, Gallium Arsenide, Silicon Carbide

Technical Parameters

Parameter	Typical range	Notes & selection driver
DiameterRequired	100, 150, 200, 300 mm	Standard wafer diameter sizes including 100mm, 150mm, 200mm, 300mm, and 450mmSEMI M1
ThicknessRequired	525–925 μm	Thickness of the wafer, typically ranging from 200μm to 775μm depending on diameterSEMI M1
Surface OrientationRequired	<100>, <111>, <110> degrees	Crystallographic orientation of the wafer surface, commonly (100), (110), or (111)SEMI M1
ResistivityRequired	0.001–100 Ω·cm	Electrical resistivity of the semiconductor material, indicating doping concentrationSEMI MF84
Total Thickness VariationRequired	≤ 5 μm	Maximum variation in wafer thickness across the entire surfaceSEMI M1
Surface RoughnessRequired	≤ 0.5 nm	Average surface roughness measured by atomic force microscopySEMI MF1810
Bow/Warp	≤ 30 μm	Excessive warp causes handling and lithography issues.SEMI M1
Edge Profile	Rounded, beveled	Reduces edge chipping and particle generation.SEMI M1
Flatness (SFQR)	≤ 0.5 μm	Critical for photolithography depth of focus.SEMI M1
Heavy Metal Contamination	< 1E10 atoms/cm²	High levels degrade minority carrier lifetime.SEMI M1
Oxygen Content	10–30 ppma	Affects internal gettering and mechanical strength.ASTM F121
Operating Temperature Range	-40–150 °C	Wafer must withstand processing and operating temperatures.
Weight	~125 (for 300 mm) g	Important for handling and shipping logistics.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Wafer Substrate Part
Provides the crystalline foundation for semiconductor device fabrication

Material: Single crystal silicon, gallium arsenide, or silicon carbide
Epitaxial Layer Part
Thin crystalline layer grown on the substrate with controlled electrical properties

Material: Silicon, silicon-germanium, or compound semiconductors
Oxide Layer Part
Insulating layer for electrical isolation and gate dielectric in transistors

Material: Silicon dioxide or high-k dielectric materials
Backside Coating Part
Protective layer on the wafer backside to prevent contamination and improve handling

Material: Silicon nitride, polyimide, or other protective films

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Semiconductor Wafers.

Manufacturers of Semiconductor Wafers

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

LZY Photonics

Jiangsu, CN

Also makes: High-Purity Silicon Wafer Substrate

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What materials are semiconductor wafers made of?

Common materials include silicon, gallium arsenide, and silicon carbide. The choice depends on the application's electrical and thermal requirements.

What are the standard wafer diameters?

Standard diameters include 100 mm, 150 mm, 200 mm, and 300 mm, as listed in SEMI M1. 450 mm is also referenced but not yet widely used.

How is wafer flatness specified?

Flatness is specified as SFQR (Site Flatness, least squares) with a maximum deviation of ≤0.5 μm, per SEMI M1. This is critical for photolithography depth of focus.

What standards apply to semiconductor wafers?

Key standards include SEMI M1 for dimensions, SEMI MF84 for resistivity, SEMI MF1810 for surface roughness, and ASTM F121 for oxygen content. Always verify compliance with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 10^-9 Torr (vacuum processing), minimal mechanical pressure
other spec:	Slurry concentration: 5-15% for CMP, Flow rate: 0.5-5 L/min for wet processing
temperature:	-40°C to 150°C (operational), up to 400°C during processing

Semiconductor Wafers

Product Specifications

Industry Taxonomies & Aliases

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards