INDUSTRY COMPONENT

Polished Surface

A precisely polished surface on a gallium arsenide wafer substrate essential for semiconductor device fabrication.

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Component Specifications

Definition
A polished surface on a high-purity gallium arsenide (GaAs) wafer substrate is a critical component in semiconductor manufacturing, achieved through mechanical and chemical polishing processes to create an atomically smooth, defect-free surface with minimal roughness. This surface serves as the foundation for epitaxial growth, lithography, and device fabrication, ensuring optimal electrical performance and yield in RF, microwave, and optoelectronic devices.
Working Principle
The polished surface is created using chemical-mechanical polishing (CMP), which combines mechanical abrasion with chemical etching. A rotating polishing pad applies pressure to the wafer while a slurry containing abrasive particles and chemical agents removes material, planarizing the surface and reducing roughness to sub-nanometer levels.
Materials
High-purity gallium arsenide (GaAs) single crystal, typically with dopants like silicon or chromium for specific electrical properties. Purity: >99.9999% (6N), crystal orientation: (100) or (111), diameter: 50mm to 150mm, thickness: 350μm to 675μm.
Technical Parameters
  • Bow/Warp <10 μm
  • Flatness <1 μm
  • Particle Count <10 particles/cm² (>0.3 μm)
  • Surface Defects None visible at 200x magnification
  • Surface Roughness <0.2 nm Ra
  • Total Thickness Variation (TTV) <2 μm
Standards
ISO 14644-1, SEMI M1, SEMI M20, ASTM F534

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Polished Surface.

gallium arsenide wafer polished surface semiconductor substrate GaAs polishing CMP process wafer flatness surface roughness epitaxial ready surface Polished Surface in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

High-Purity Gallium Arsenide Wafer Substrate

Semiconductor-grade GaAs wafer for RF communication device fabrication.

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Engineering Analysis

Risks & Mitigation
  • Surface contamination from particles or residues
  • Subsurface damage from aggressive polishing
  • Wafer breakage due to excessive pressure
  • Non-uniform thickness affecting device yield
FMEA Triads
Trigger: Inconsistent slurry distribution during CMP
Failure: Uneven surface roughness and localized defects
Mitigation: Implement real-time slurry monitoring and automated flow control systems
Trigger: Pad wear or contamination
Failure: Increased surface scratches and reduced polish uniformity
Mitigation: Regular pad conditioning and replacement schedules with inline inspection
Trigger: Improper wafer handling post-polishing
Failure: Surface contamination or mechanical damage
Mitigation: Use automated handling in cleanroom environments with protective cassettes

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Surface roughness tolerance: ±0.05 nm from spec, TTV tolerance: ±0.5 μm, dimensional tolerance per SEMI M1 specifications
Test Method
Atomic Force Microscopy (AFM) for roughness, laser scanning for thickness variation, surface inspection via dark-field microscopy, ellipsometry for film uniformity

Buyer Feedback

★★★★☆ 4.6 / 5.0 (38 reviews)

"Testing the Polished Surface now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Computer, Electronic and Optical Product Manufacturing sector, I confirm this Polished Surface meets all ISO standards."

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Frequently Asked Questions

Why is surface roughness critical for GaAs wafers?

Low surface roughness (<0.2 nm) is essential to prevent defects during epitaxial growth, ensure uniform device performance, and minimize signal loss in high-frequency applications.

What standards apply to polished GaAs wafer surfaces?

Key standards include SEMI M1 for dimensions, SEMI M20 for surface quality, and ISO 14644-1 for cleanroom requirements during polishing.

How does polishing affect wafer electrical properties?

Proper polishing removes subsurface damage, reduces carrier recombination sites, and maintains crystal integrity, leading to higher electron mobility and device reliability.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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