Indium arsenide, InAs, or indium monoarsenide, is a narrow-bandgap semiconductor composed of indium and arsenic. It has the appearance of grey cubic crystals with a melting point of 942 °C.[5]
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| Names | |
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| IUPAC name
Indium(III) arsenide | |
| Other names
Indium monoarsenide | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider |
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| ECHA InfoCard | 100.013.742 
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PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| InAs | |
| Molar mass | 189.740 g/mol |
| Density | 5.67 g/cm3[1] |
| Melting point | 942 °C (1,728 °F; 1,215 K)942[1] |
| 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) |
4[2] |
| Structure | |
| Zinc blende | |
a = 6.0583 Å | |
| Thermochemistry[3] | |
Heat capacity (C) |
47.8 J·mol−1·K−1 |
Std molar |
75.7 J·mol−1·K−1 |
Std enthalpy of |
-58.6 kJ·mol−1 |
Gibbs free energy (ΔfG⦵) |
-53.6 kJ·mol−1 |
| Hazards | |
| GHS labelling: | |
  [4]
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| Danger[4] | |
| H301, H331[4] | |
| P261, P301+P310, P304+P340, P311, P405, P501[4] | |
| NFPA 704 (fire diamond) | |
| Safety data sheet (SDS) | External SDS |
| Related compounds | |
Other anions |
Indium nitride Indium phosphide Indium antimonide |
Other cations |
Gallium arsenide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
Indium arsenide is similar in properties to gallium arsenide and is a direct bandgap material, with a bandgap of 0.35 eV at room temperature.
Indium arsenide is used for the construction of infrared detectors, for the wavelength range of 1.0–3.8 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 diode lasers.
InAs is well known for its high electron mobility and narrow energy bandgap. It is widely used as a 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 the formation of the quantum dots.[6] Quantum dots can also be formed in indium gallium arsenide, as indium arsenide dots sitting in the gallium arsenide matrix.
