DOI: 10.1063/1.463657. Surface diffusion of Sb on Ge(111) monitored quantitatively with optical second harmonic microscopy

Surface diffusion of Sb on Ge(111) monitored quantitatively with optical second harmonic microscopy

10.1063/1.463657

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Surface diffusion of Sb on Ge(111) has been measured with the newly developed technique of optical second harmonic microscopy. In this method, concentration profiles at submonolayer coverage are imaged directly by surface second harmonic generation with 5 μ spatial resolution. A Boltzmann–Matano analysis yields the coverage dependence of the diffusivity D without parametrization. Experiments were performed at roughly 70% of the bulk melting temperature Tm. In the coverage range 0≤θ≤0.6, the activation energy Ediff remains constant at 47.5±1.5 kcal/mol, but the pre-exponential factor D0 decreases from 8.7×103±0.4 to 1.6×102±0.4 cm2/s. Both Ediff and D0 are quite large, which is consistent with high-temperature measurements in other systems. The inadequacies of current theories for high-temperature surface diffusion are outlined, and a new vacancy model is proposed for low-coverage diffusion. The model accounts semiquantitatively for the large values of Ediff and D0, and suggests that these quantities may be manipulated using doping levels and photon illumination. An islanding mechanism is proposed to explain the decrease in D0 with θ.

Bibliography

Schultz, K. A., & Seebauer, E. G. (1992). Surface diffusion of Sb on Ge(111) monitored quantitatively with optical second harmonic microscopy. The Journal of Chemical Physics, 97(9), 6958â6967.

Authors 2

K. A. Schultz (first)
E. G. Seebauer (additional)

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Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 8:20 a.m.)
Deposited	1 year, 6 months ago (Feb. 7, 2024, 11:08 a.m.)
Indexed	1 year, 6 months ago (Feb. 10, 2024, 3:04 p.m.)
Issued	32 years, 10 months ago (Nov. 1, 1992)
Published	32 years, 10 months ago (Nov. 1, 1992)
Published Print	32 years, 10 months ago (Nov. 1, 1992)

Funders 0

None

BibTeX

@article{Schultz_1992, title={Surface diffusion of Sb on Ge(111) monitored quantitatively with optical second harmonic microscopy}, volume={97}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.463657}, DOI={10.1063/1.463657}, number={9}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Schultz, K. A. and Seebauer, E. G.}, year={1992}, month=nov, pages={6958–6967} }

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