Gallium(II) sulfide
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| Other names
Gallium sulfide[citation needed]
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| Identifiers | |
3D model (JSmol)
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| ChemSpider | |
| ECHA InfoCard | 100.031.522 |
PubChem CID
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CompTox Dashboard (EPA)
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| Properties | |
| GaS• | |
| Molar mass | 101.788 g mol−1 |
| Appearance | Yellow crystals |
| Density | 3.86 g cm−3 |
| Melting point | 965 °C (1,769 °F; 1,238 K) |
| −-23.0·10−6 cm3/mol | |
| Structure | |
| hexagonal, hP8 | |
| P63/mmc, No. 194 | |
| Related compounds | |
Related compounds
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Gallium(III) sulfide |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Gallium(II) sulfide, GaS, is a chemical compound of gallium and sulfur. The normal form of gallium(II) sulfide as made from the elements has a hexagonal layer structure containing Ga24+ units which have a Ga-Ga distance of 248pm.[1] This layer structure is similar to GaTe, GaSe and InSe.[1] An unusual metastable form, with a distorted wurtzite structure has been reported as being produced using MOCVD. The metal organic precursors were di-tert-butyl gallium dithiocarbamates, for example GatBu2(S2CNMe2) and this was deposited onto GaAs. The structure of the GaS produced in this way is presumably Ga2+ S2−.[2]
Single layers of gallium sulfide are dynamically stable two-dimensional semiconductors, in which the valence band has an inverted Mexican-hat shape, leading to a Lifshitz transition as the hole-doping is increased.[3]
Gallium(II) sulfide demonstrates nonlinear optical activities, including second-harmonic generation and two-photon excited fluorescence.[4]
References
[edit]- ^ a b Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
- ^ MOCVD Growth of Gallium Sulfide Using Di-tert-butyl Gallium Dithiocarbamate Precursors: Formation of a Metastable Phase of GaS A. Keys, S G. Bott, A. R. Barron Chem. Mater., 11 (12), 3578 -3587, 1999. doi:10.1021/cm9903632
- ^ V. Zolyomi, N. D. Drummond and V. I. Fal'ko (2013). "Band structure and optical transitions in atomic layers of hexagonal gallium chalcogenides". Phys. Rev. B. 87 (19): 195403. arXiv:1302.6067. Bibcode:2013PhRvB..87s5403Z. doi:10.1103/PhysRevB.87.195403.
- ^ Safayet Ahmed, Ping Kwong Cheng, Junpeng Qiao, Wei Gao, Ahmed Mortuza Saleque, Md. Nahian Al Subri Ivan, Ting Wang, Tawsif Ibne Alam, Sumaiya Umme Hani, Zong Liang Guo, Siu Fung Yu, and Yuen Hong Tsang (2022). "Nonlinear Optical Activities in Two-Dimensional Gallium Sulfide: A Comprehensive Study". ACS Nano. 16 (8): 12390–12402. doi:10.1021/acsnano.2c03566. hdl:10397/99690. PMID 35876327.
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