Indium arsenide

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Indium arsenide[1]
Sphalerite-unit-cell-3D-balls.png
Indium arsenide.jpg
Identifiers
CAS number 1303-11-3 YesY
PubChem 91500
ChemSpider 82621 YesY
Jmol-3D images Image 1
Properties
Molecular formula InAs
Molar mass 189.740 g/mol
Density 5.67 g/cm3
Melting point 942°C
Band gap 0.354 eV (300 K)
Electron mobility 40000 cm2/(V*s)
Thermal conductivity 0.27 W/(cm*K) (300 K)
Refractive index (nD) 3.51
Structure
Crystal structure Zinc Blende
Lattice constant a = 6.0583 Å
Thermochemistry
Specific
heat capacity
C
47.8 J·mol-1·K-1
Std molar
entropy
So298
75.7 J·mol-1·K-1
Std enthalpy of
formation
ΔfHo298
-58.6 kJ·mol-1
Hazards
EU classification Toxic (T)
Dangerous for the environment (N)
R-phrases R23/25, R50/53
S-phrases (S1/2), S20/21, S28, S45, S60, S61
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 4: Very short exposure could cause death or major residual injury. E.g., VX gas Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Related compounds
Other anions Indium phosphide
Indium antimonide
Other cations Gallium arsenide
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

Indium arsenide, InAs, or indium monoarsenide, is a semiconductor material, a semiconductor composed of indium and arsenic. It has the appearance of grey cubic crystals with a melting point of 942 °C.[2]

Indium arsenide is used for construction of infrared detectors, for the wavelength range of 1–3.8 µm. The detectors are usually photovoltaic photodiodes. Cryogenically cooled detectors have lower noise, but InAs detectors can be used in higher-power applications at room temperature as well. Indium arsenide is also used for making of diode lasers.

Indium arsenide is similar to gallium arsenide and is a direct bandgap material.

Indium arsenide is sometimes used together with indium phosphide. Alloyed with gallium arsenide it forms indium gallium arsenide - a material with band gap dependent on In/Ga ratio, a method principally similar to alloying indium nitride with gallium nitride to yield indium gallium nitride.

InAs is well known for its high electron mobility and narrow energy bandgap. It is widely used as terahertz radiation source as it is a strong photo-Dember emitter.

Quantum dots can be formed in a monolayer of indium arsenide on indium phosphide or gallium arsenide. The mismatches of lattice constants of the materials create tensions in the surface layer, which in turn leads to formation of the quantum dots.[3] Quantum dots can also be formed in indium gallium arsenide, as indium arsenide dots sitting in the gallium arsenide matrix.

References[edit]

  1. ^ Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, FL: CRC Press, pp. 4–61, ISBN 0-8493-0594-2 
  2. ^ "Thermal properties of Indium Arsenide (InAs)". Retrieved 2011-11-22. 
  3. ^ "oe magazine - eye on technology". Archived from the original on 2006-10-18. Retrieved 2011-11-22. 

External links[edit]