Editorial Feature

Gallium Antimonide (GaSb) Semiconductors

Gallium antimonide (GaSb) is a semiconductor made of antimony and gallium belonging to the III to V semiconductor family. The lattice constant of GaSb is 0.61 nm. The unique lattice structure of GaSb enables its use in sophisticated semiconductor applications. For example, researchers at the Centre for Quantum Devices, Northwestern University, in January 2013 developed the first-ever dual-mode passive and active infrared camera chip made of gallium antimonide/indium arsenide.


Gallium antimonide finds applications in:

  • Infrared detectors,
  • Infrared LEDs,
  • Transistors
  • Lasers
  • Thermophotovoltaic systems

Chemical Properties

The chemical properties of gallium antimonide are provided in the table below:

Chemical Properties
Chemical Formula GaSb
Molecular Weight 191.483 g/mol
CAS No. 12064-03-8
IUPAC Name Gallium (III) antimonide
Group III-V
Band Gap 0.726 eV
Band Gap Type Indirect
Crystal Structure Zinc Blende
Symmetry Group Td2-F43m
Lattice Constant 6.09593 Angstroms

Electrical Properties

The electrical properties of gallium antimonide are provided in the table below:

Electrical Properties
Intrinsic Carrier Concentration 1.5x1012cm-3
Electron Mobility ≤ 3000 cm2 V-1 s-1
Hole Mobility ≤ 1000 cm2 V-1 s-1
Electron Diffusion Coefficient ≤ 75 cm2 s-1
Hole Diffusion Coefficient ≤ 25 cm2 s-1

Thermal, Mechanical and Optical Properties

The thermal, mechanical and optical properties of gallium antimonide are provided in the tables below:

Mechanical Properties
Melting Point 712 °C
Density 5.614 g cm-3
Bulk Modulus 5.63•1011 dyn cm-2
Thermal Properties
Thermal Conductivity 0.32 W cm-1 °C-1
Thermal Diffusivity 0.23 cm2 s-1
Thermal Expansion Coefficient 7.75x10-6 °C-1
Optical Properties
Refractive Index (589 nm @ 293 K) 3,8
Radiative Recombination Coefficient (@ 300 K) 10-10 cm3 s-1

Safety Information

Safety Information
GHS Hazard Statements H302-Harmful if swallowed
H332-Harmful if inhaled
H401-Toxic to aquatic life
Safety Precautions S 61


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