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Cu-Pt type ordering in III-V semiconductor

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Example of Cu-Pt type ordering in Cd-Zn-Te alloy.

One of the most studied atomic ordering is CuPt type ordering in III-V semiconductor alloy in chemistry and physics. It occurs in III-V alloy when the cation planes take an alternate sequence of A-rich and B-rich plane following AxB1−xC. The resulting structure is usually called as superlattice-like structure along or – called (111) B plane, or along or – called (111) A plane. The two ordering direction is thus called CuPt type A and B ordering.

The same type ordering is also observed in II-VI alloy such as CdZnTe alloy. The ordering sequence viewed on atomic planes along and reveals Cd and Zn alternating planes.

This ordering reduces the lattice symmetry ordering to L11 and leads to change of its optical and electrical properties. The apparent effects are: band gap reduction, valence band splitting, and optical anisotropy. For instance, in CuPt type B ordering, the L point of the Brillouin zone fold back to the Γ-point, and the folded band “repels” the original conduction band minimum and bring down the bottom of conduction band.

AlInP epilayers grown by metal-organic vapour-phase epitaxy on GaAs substrates exhibit CuPt-B-type spontaneous atomic ordering. Additionally, CuPt-type structures were observed in CdZnTe during metal-organic vapor phase epitaxy.

References

  1. Lee, H. S.; Kwon, M. S.; Lee, J. Y.; Kim, T. W.; Park, H. L. (September 2003). "Formation of the CuPt-type ordered structure in CdxZn1−xTe epilayer grown on ZnTe buffer layer on (001) GaAs substrate". Journal of Materials Science Letters. 22 (18): 1263–1267. doi:10.1023/A:1025458102274. S2CID 137365490. Retrieved 2021-05-02.
  2. Jinghua, Zhao; Xiaohong, Tang; Jinghua, Teng (27 May 2009). "Atomic ordering of AlInP grown by MOVPE at different temperatures in pure ambient N2". CrystEngComm. 11 (6): 1068–1072. doi:10.1039/B817012F. ISSN 1466-8033. Retrieved 7 July 2021.
  3. Kwon, Myoung Seok; Lee, Jeong Yong; Suh, Sang Hee (1998). "Observation of CuPt-Type Ordered Structure in CdZnTe during Organometallic Vapor Phase Epitaxial Growth". Japanese Journal of Applied Physics. 37 (1A): L21. Bibcode:1998JaJAP..37L..21K. doi:10.1143/JJAP.37.L21. ISSN 1347-4065. S2CID 119446784. Retrieved 7 July 2021.
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