High temperature growth of Ag phases on Ge(111)
Journal Article
·
· Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films
- Department of Physics, University of California Davis, 1 Shields Avenue, Davis, California 95616-8677 (United States)
The growth of the (3 Multiplication-Sign 1) and ({radical}3 Multiplication-Sign {radical}3)R30 Degree-Sign phases of Ag on Ge(111) on substrates at temperatures from 540 to 660 Degree-Sign C is characterized with low energy electron microscopy (LEEM) and low energy electron diffraction (LEED). From 540 Degree-Sign C to the Ag desorption temperature of 575 Degree-Sign C, LEEM images show that growth of the (3 Multiplication-Sign 1) phase begins at step edges. Upon completion of the (3 Multiplication-Sign 1) phase, the ({radical}3 Multiplication-Sign {radical}3)R30 Degree-Sign phase is observed with a dendritic growth morphology that is not much affected by steps. For sufficiently high deposition rates, Ag accumulates on the sample above the desorption temperature. From 575 to 640 Degree-Sign C, the growth proceeded in a manner similar to that at lower temperatures, with growth of the (3 Multiplication-Sign 1) phase to completion, followed by growth of the ({radical}3 Multiplication-Sign {radical}3)R30 Degree-Sign phase. Increasing the substrate temperature to 660 Degree-Sign C resulted in only (3 Multiplication-Sign 1) growth. In addition, for samples with Ag coverage less than 0.375ML, LEEM and LEED images were used to follow a reversible phase transformation near 575 Degree-Sign C, between a mixed high coverage phase of [(4 Multiplication-Sign 4) + (3 Multiplication-Sign 1)] and the high temperature, lower coverage (3 Multiplication-Sign 1) phase.
- OSTI ID:
- 22111928
- Journal Information:
- Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films, Journal Name: Journal of Vacuum Science and Technology. A, Vacuum, Surfaces and Films Journal Issue: 2 Vol. 31; ISSN 0734-2101; ISSN JVTAD6
- Country of Publication:
- United States
- Language:
- English
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