Abstract
CuPt ordering, resulting in formation of a natural monolayer {111} super-lattice occurs spontaneously during organometallic vapor phase epitaxial growth of Ga0.52In0.48P. The degree of order is found to be a function of the input partial pressure of the phosphorus precursor (PP) during growth. This is thought to be mainly due to the effect of PP on the surface reconstruction. A change in order parameter is associated with a change in the bandgap energy. Thus a practical application of ordering is the production of a heterostructure by simply changing the flow rate of the P precursor during growth. Examination of transmission electron microscopy data and photoluminescence spectra indicates that order/ disorder (O/D) (really less ordered on more ordered) and D/O heterostructures formed by growth using PH3 at a temperature of 620°C are graded over several thousands of Å: The ordered structure from the lower layer persists into the upper layer. Similar results were obtained at 620°C when the first layer was grown using PH3 (V/III = 160) and the second using tertiarybutylphosphine (TBP) (V/III = 5). The use of a temperature of 670°C to produce heterostructures using either PH3 or TBP yields a totally different behavior. Abrupt D/O and O/D heterostructures can be produced by changing PP during the growth cycle. The cause of this difference in behavior is not entirely clear. However, it appears to be related to a very slow change in the surface reconstruction measured using surface photo absorption, when the PH3 partial pressure is changed at 620 L.
Original language | English |
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Pages (from-to) | 1250-1255 |
Number of pages | 6 |
Journal | Journal of Electronic Materials |
Volume | 26 |
Issue number | 10 |
DOIs | |
Publication status | Published - 1997 Oct |
Externally published | Yes |
Bibliographical note
Funding Information:This research was supported by the U.S. Department of Energy, Basic Energy Sciences Division.
Keywords
- GaInP
- Heterostructures
- Order
- Organometallic vapor phase epitaxy (OMVPE)
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering
- Materials Chemistry