INDUSTRY COMPONENT

Bulk GaAs Crystal

Bulk GaAs crystal is a high-purity semiconductor material used as the foundational substrate for manufacturing gallium arsenide wafers in electronic and optical applications.

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Component Specifications

Definition
Bulk GaAs crystal refers to a large, single-crystal ingot of gallium arsenide (GaAs) grown through controlled crystallization processes such as Liquid Encapsulated Czochralski (LEC) or Vertical Gradient Freeze (VGF) methods. This crystalline material serves as the starting material for producing high-purity GaAs wafer substrates, which are essential for manufacturing semiconductor devices including integrated circuits, LEDs, laser diodes, and photovoltaic cells. The crystal structure must maintain exceptional purity (typically 99.9999% or higher) and minimal defect density to ensure optimal electronic properties.
Working Principle
Bulk GaAs crystals are grown through controlled solidification from a molten mixture of gallium and arsenic under precisely maintained temperature and pressure conditions. The process involves seeding a small GaAs crystal into the melt, then slowly withdrawing it while maintaining thermal gradients that promote single-crystal growth. This results in a cylindrical ingot with a consistent crystalline orientation (typically <100> or <111>), which is then sliced, polished, and etched to create wafer substrates.
Materials
Gallium Arsenide (GaAs) with dopants including silicon (Si), tellurium (Te), or chromium (Cr) for n-type or p-type conductivity. Purity requirements: 6N (99.9999%) or higher for electronic grade, with controlled concentrations of impurities such as carbon, oxygen, and transition metals below 1 part per billion.
Technical Parameters
  • Length 150-500 mm
  • Diameter 50-200 mm
  • Mobility 200-8500 cm^2/V·s
  • Resistivity 10^6-10^9 ohm-cm (semi-insulating)
  • Crystal Orientation <100>, <111>
  • Dislocation Density <1000 cm^-2
  • Carrier Concentration 10^14-10^18 cm^-3
Standards
ISO 14644-1, ISO 9001, SEMI M1, SEMI M59, DIN 50441

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bulk GaAs Crystal.

GaAs crystal gallium arsenide substrate semiconductor material bulk crystal growth LEC method VGF method wafer manufacturing electronic grade GaAs Bulk GaAs Crystal Bulk GaAs Crystal 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
  • Arsenic toxicity during handling
  • Thermal stress cracking during growth
  • Crystalline defect propagation
  • Contamination from crucible materials
  • Non-uniform doping distribution
FMEA Triads
Trigger: Improper temperature gradient during crystal growth
Failure: Polycrystalline formation or high dislocation density
Mitigation: Implement precise thermal profiling and real-time monitoring systems with automated feedback control
Trigger: Contamination from growth chamber or crucible
Failure: Reduced carrier mobility and increased leakage current
Mitigation: Use high-purity quartz or pyrolytic boron nitride crucibles with controlled atmosphere and regular chamber maintenance
Trigger: Inconsistent pulling/rotation rates
Failure: Diameter variations and stress-induced defects
Mitigation: Implement servo-controlled pulling mechanisms with vibration damping and real-time diameter measurement

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Diameter tolerance: ±0.5 mm, Orientation accuracy: ±0.5°, Thickness variation: <5 μm across wafer
Test Method
X-ray diffraction for crystal orientation, Hall effect measurement for electrical properties, photoluminescence spectroscopy for purity assessment, etch pit density measurement for dislocation counting

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between bulk GaAs crystal and GaAs wafer?

Bulk GaAs crystal refers to the large single-crystal ingot grown through crystallization processes, while GaAs wafers are thin slices cut from this bulk crystal that have been polished and processed for device fabrication.

Why is GaAs preferred over silicon for certain applications?

GaAs offers higher electron mobility, direct bandgap for efficient light emission, and better performance at high frequencies and temperatures, making it ideal for RF devices, optoelectronics, and high-speed applications.

What are the main challenges in growing bulk GaAs crystals?

Main challenges include controlling stoichiometry (gallium to arsenic ratio), minimizing defect formation (dislocations, twins), maintaining high purity, and achieving uniform doping distribution throughout the crystal.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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