Cu-Pt type ordering in III-V semiconductor
- Cu-Pt type ordering in III-V semiconductor
-
One of the most studied atomic ordering is CuPt type ordering in III-V semiconductor alloy. 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 [1-11] or [-111] – called (111) B plane, or along [-1-1-1] or [11-1] – 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 [-111] and [1-11] reveals Cd and Zn alternating planes. Figure 1 below shows schematically the ordering mentioned:
Figure 1. Example of Cu-Pt type ordering in CdZnTe alloy
(figures courtesy of Journal of Materials Science Letters 22, 2003, 1263–1267)
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.
References
Wikimedia Foundation.
2010.
Look at other dictionaries:
crystal — crystallike, adj. /kris tl/, n., adj., v., crystaled, crystaling or (esp. Brit.) crystalled, crystalling. n. 1. a clear, transparent mineral or glass resembling ice. 2. the transparent form of crystallized quartz. 3. Chem., Mineral. a solid body… … Universalium
Crystal — /kris tl/, n. 1. a city in SE Minnesota, near Minneapolis. 25,543. 2. a female given name. * * * I Any solid material whose atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry. Each of a crystal s… … Universalium
Business and Industry Review — ▪ 1999 Introduction Overview Annual Average Rates of Growth of Manufacturing Output, 1980 97, Table Pattern of Output, 1994 97, Table Index Numbers of Production, Employment, and Productivity in Manufacturing Industries, Table (For Annual… … Universalium
spectroscopy — spectroscopist /spek tros keuh pist/, n. /spek tros keuh pee, spek treuh skoh pee/, n. the science that deals with the use of the spectroscope and with spectrum analysis. [1865 70; SPECTRO + SCOPY] * * * Branch of analysis devoted to identifying… … Universalium
Conventional PCI — PCI Local Bus Three 5 volt 32 bit PCI expansion slots on a motherboard (PC bracket on left side) … Wikipedia
Antimony — This article is about the element. For the town, see Antimony, Utah. Not to be confused with Antinomy, a type of paradox. tin ← antimony → tellurium As ↑ Sb ↓ Bi … Wikipedia
Glass — This article is about the material. For other uses, see Glass (disambiguation). Moldavite, a natural glass formed by meteorite impact, from Besednice, Bohemia … Wikipedia
Samarium — promethium ← samarium → europium ↑ Sm ↓ … Wikipedia
Colloidal crystal — A colloidal crystal is an ordered array of colloid particles, analogous to a standard crystal whose repeating subunits are atoms or molecules.[1] A natural example of this phenomenon can be found in the gem opal, where spheres of silica assume a… … Wikipedia
Hydrogen — This article is about the chemistry of hydrogen. For the physics of atomic hydrogen, see Hydrogen atom. For other meanings, see Hydrogen (disambiguation). ← hydrogen → helium … Wikipedia
