Indium(III) selenide is a compound of indium and selenium. It has potential for use in photovoltaic devices and has been the subject of extensive research. The two most common phases, α and β, have a layered structure, while γ has a "defect wurtzite structure." In all, five polymorphs are known: α, β, γ, δ, κ.[1] The α-β phase transition is accompanied by a change in electrical conductivity.[2] The band gap of γ-In2Se3 is approximately 1.9 eV.
| Names | |
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| IUPAC name
Indium(III) selenide
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| Other names
indium selenide, indium sesquiselenide
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| Identifiers | |
| ECHA InfoCard | 100.031.821 |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| In2Se3 | |
| Molar mass | 466.516 g/mol |
| Appearance | black crystalline solid |
| Density | 5.80 g/cm³ |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
editThe method of production influences the polymorph generated. For example, thin films of pure γ-In2Se3 have been produced from trimethylindium (InMe3) and hydrogen selenide via MOCVD techniques.[3]
- 3 H2Se + 2 In(CH3)3 → In2Se3 + 6 CH4
A conventional route entails heating the elements in a seal-tube:[4]
- 3 Se + 2 In → In2Se3
See also
editGeneral references
editGreenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
Footnotes
edit- ^ Crystal structure of κ-In2Se3. Jasinski, J.; Swider, W.; Washburn, J.; Liliental-Weber, Z.; Chaiken, A.; Nauka, K.; Gibson, G. A.; Yang, C. C. Applied Physics Letters, Volume 81, Issue 23, id. 4356 (2002) doi:10.1063/1.1526925
- ^ Some Electrical and Optical Properties of In2Se3 D. Bidjin, S. Popovi, B. Elustka Physica Status Solidi A Volume 6, Issue 1, Pages 295 – 299 doi:10.1002/pssa.2210060133
- ^ Growth of single-phase In2Se3 by using metal organic chemical vapor deposition with dual-source precursors Chang, K. J.; Lahn, S. M.; Chang, J. Y. Applied Physics Letters, Volume 89, Issue 18, id. 182118 (3 pages) (2006). doi:10.1063/1.2382742
- ^ O. E. Donges (1963). "Indium Selenides and Tellurides". In G. Brauer (ed.). Handbook of Preparative Inorganic Chemistry, 2nd Ed. Vol. 2pages=865. NY, NY: Academic Press.