Indium antimonide

Indium antimonide
Ball and stick cell model of indium antimonide
Sample of crystalline indium antimonide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.812 Edit this at Wikidata
EC Number
  • 215-192-3
RTECS number
  • NL1105000
UNII
UN number 1549
  • InChI=1S/In.Sb checkY
    Key: WPYVAWXEWQSOGY-UHFFFAOYSA-N checkY
  • [In]#[Sb]
Properties
InSb
Molar mass 236.578 g·mol−1
Appearance Dark grey, metallic crystals
Density 5.7747 g⋅cm−3[1]
Melting point 524 °C (975 °F; 797 K)[1]
Band gap 0.17 eV
Electron mobility 7.7 mC⋅s⋅g−1 (at 27 °C)
Thermal conductivity 180 mW⋅K−1⋅cm−1 (at 27 °C)
4[2]
Structure
Zincblende
T2d-F-43m
a = 0.648 nm
Tetrahedral
Thermochemistry[3]
49.5 J·K−1·mol−1
86.2 J·K−1·mol−1
−30.5 kJ·mol−1
−25.5 kJ·mol−1
Hazards
GHS labelling:
GHS07: Exclamation mark GHS09: Environmental hazard[4]
Warning
H302, H332, H411
P273
Safety data sheet (SDS) External SDS
Related compounds
Other anions
Indium nitride
Indium phosphide
Indium arsenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
checkY verify (what is checkY☒N ?)

Indium antimonide (InSb) is a crystalline compound made from the elements indium (In) and antimony (Sb). It is a narrow-gap semiconductor material from the III-V group used in infrared detectors, including thermal imaging cameras, FLIR systems, infrared homing missile guidance systems, and in infrared astronomy. Indium antimonide detectors are sensitive to infrared wavelengths between 1 and 5 μm.

Indium antimonide was a very common detector in the old, single-detector mechanically scanned thermal imaging systems. Another application is as a terahertz radiation source as it is a strong photo-Dember emitter.

History

The intermetallic compound was first reported by Liu and Peretti in 1951, who gave its homogeneity range, structure type, and lattice constant.[5] Polycrystalline ingots of InSb were prepared by Heinrich Welker in 1952, although they were not very pure by today's semiconductor standards. Welker was interested in systematically studying the semiconducting properties of the III-V compounds. He noted how InSb appeared to have a small direct band gap and a very high electron mobility.[6] InSb crystals have been grown by slow cooling from liquid melt at least since 1954.[7]

In 2018, a research team at Delft University of Technology claimed that indium antimonide nanowires showed potential application in creating Majorana zero mode quasiparticles for use in quantum computing; Microsoft opened a laboratory at the university to further this research, however Delft later retracted the paper.[8][9]

Physical properties

InSb has the appearance of dark-grey silvery metal pieces or powder with vitreous lustre. When subjected to temperatures over 500 °C, it melts and decomposes, liberating antimony and antimony oxide vapors.

The crystal structure is zincblende with a 0.648 nm lattice constant.[10]

Electronic properties

InSb infrared detector manufactured by Mullard in the 1960s.

InSb is a narrow direct band gap semiconductor with an energy band gap of 0.17 eV at 300 K and 0.23 eV at 80 K.[10]

Undoped InSb possesses the largest ambient-temperature electron mobility of 78000 cm2/(V⋅s),[11] electron drift velocity, and ballistic length (up to 0.7 μm at 300 K)[10] of any known semiconductor, except for carbon nanotubes.

Indium antimonide photodiode detectors are photovoltaic, generating electric current when subjected to infrared radiation. InSb's internal quantum efficiency is effectively 100% but is a function of the thickness particularly for near bandedge photons.[12] Like all narrow bandgap materials InSb detectors require periodic recalibrations, increasing the complexity of the imaging system. This added complexity is worthwhile where extreme sensitivity is required, e.g. in long-range military thermal imaging systems. InSb detectors also require cooling, as they have to operate at cryogenic temperatures (typically 80 K). Large arrays (up to 2048×2048 pixels) are available.[13] HgCdTe and PtSi are materials with similar use.

A layer of indium antimonide sandwiched between layers of aluminium indium antimonide can act as a quantum well. In such a heterostructure InSb/AlInSb has recently been shown to exhibit a robust quantum Hall effect.[14] This approach is studied in order to construct very fast transistors.[15] Bipolar transistors operating at frequencies up to 85 GHz were constructed from indium antimonide in the late 1990s; field-effect transistors operating at over 200 GHz have been reported more recently (Intel/QinetiQ).[citation needed] Some models suggest that terahertz frequencies are achievable with this material. Indium antimonide semiconductor devices are also capable of operating with voltages under 0.5 V, reducing their power requirements.[citation needed]

Growth methods

InSb can be grown by solidifying a melt from the liquid state (Czochralski process), or epitaxially by liquid phase epitaxy, hot wall epitaxy or molecular beam epitaxy. It can also be grown from organometallic compounds by MOVPE.[citation needed]

Device applications

References

  1. ^ a b Haynes, p. 4.66
  2. ^ Haynes, pp. 12.156
  3. ^ Haynes, pp. 5.22
  4. ^ "Indium Antimonde". American Elements. Retrieved June 20, 2019.
  5. ^ Liu, T.S.; Peretti, E.A. (1951). "The Lattice Parameter of InSb". Trans AIME. 191: 791.
  6. ^ Orton, J.W. (2009). Semiconductors and the Information Revolution: Magic Crystals that Made IT Happen. Academic Press. pp. 138–9. ISBN 9780444532404.
  7. ^ Avery, D G; Goodwin, D W; Lawson, W D; Moss, T S (1954). "Optical and Photo-Electrical Properties of Indium Antimonide". Proceedings of the Physical Society. Series B. 67 (10): 761. Bibcode:1954PPSB...67..761A. doi:10.1088/0370-1301/67/10/304.
  8. ^ Dedezade, Esat (2019-02-21). "Microsoft's new quantum computing lab in Delft opens its doors to a world of possibilities". Microsoft News Centre Europe.
  9. ^ Kaku, Michio (2023). Quantum Supremacy (1st ed.). New York: Doubleday. p. 96. ISBN 978-0-385-54836-6.
  10. ^ a b c Properties of Indium Antimonide (InSb). ioffe.ru
  11. ^ Rode, D. L. (1971). "Electron Transport in InSb, InAs, and InP". Physical Review B. 3 (10): 3287–3299. Bibcode:1971PhRvB...3.3287R. doi:10.1103/PhysRevB.3.3287.
  12. ^ Avery, D G; Goodwin, D W; Rennie, Miss A E (1957). "New infra-red detectors using indium antimonide". Journal of Scientific Instruments. 34 (10): 394. Bibcode:1957JScI...34..394A. doi:10.1088/0950-7671/34/10/305.
  13. ^ Beckett, M.G. (1995). "3. Camera". High Resolution Infrared Imaging (PhD). Cambridge University. uk.bl.ethos.388828.
  14. ^ Alexander-Webber, J. A.; Baker, A. M. R.; Buckle, P. D.; Ashley, T.; Nicholas, R. J. (2012-07-05). "High-current breakdown of the quantum Hall effect and electron heating in InSb/AlInSb". Physical Review B. 86 (4). American Physical Society (APS): 045404. Bibcode:2012PhRvB..86d5404A. doi:10.1103/physrevb.86.045404.
  15. ^ Will Knight (2005-02-10). "'Quantum well' transistor promises lean computing". New Scientist. Retrieved 2020-01-11.

Cited sources

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