Measurement of Ehrlich-Schwoebel barrier contribution to the self-organized formation of ordered surface patterns on Ge(001)
Abstract
Normal-incidence 1-keV Ar+ ion bombardment leads to amorphization and ultrasmoothing of Ge at room temperature, but at elevated temperatures the Ge surface remains crystalline and is unstable to the formation of self-organized nanoscale patterns of ordered pyramid-shaped pits. The physical phenomenon distinguishing the high-temperature patterning from room-temperature ultrasmoothing is believed to be a surface instability due to the Ehrlich-Schwoebel barrier for diffusing vacancies and adatoms, which is not present on the amorphous material. This real-time grazing-incidence small-angle x-ray scattering study compares smoothing of a prepatterned Ge sample at room temperature with patterning of an initially flat Ge sample at an elevated temperature. In both experiments, when the nanoscale structures are relatively small in height, the average kinetics can be explained by a linear theory. Furthermore, the linear theory coefficients, indicating surface stability or instability, were extracted for both experiments. A comparison between the two measurements allows estimation of the contribution of the Ehrlich-Schwoebel barrier to the self-organized formation of ordered nanoscale patterns on crystalline Ge surfaces.
- Authors:
-
[1];
[2];
[3];
[2];
- Boston Univ., MA (United States)
- Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
- Univ. of Vermont, Burlington, VT (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
- Publication Date:
- Research Org.:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1737418
- Report Number(s):
- BNL-220702-2020-JAAM
Journal ID: ISSN 2469-9950; TRN: US2205494
- Grant/Contract Number:
- SC0012704; EE0008444; AC02-76SF00515; AC02-06CH11357; AC05-00OR22725; CHE-1531834
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 20; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Irradiation effects; surface & interfacial phenomena; elemental semiconductors; nanostructures; x-ray scattering
Citation Formats
Myint, Peco, Erb, Denise, Zhang, Xiaozhi, Wiegart, Lutz, Zhang, Yugang, Fluerasu, Andrei, Headrick, Randall L., Facsko, Stefan, and Ludwig, Karl F. Measurement of Ehrlich-Schwoebel barrier contribution to the self-organized formation of ordered surface patterns on Ge(001). United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.201404.
Myint, Peco, Erb, Denise, Zhang, Xiaozhi, Wiegart, Lutz, Zhang, Yugang, Fluerasu, Andrei, Headrick, Randall L., Facsko, Stefan, & Ludwig, Karl F. Measurement of Ehrlich-Schwoebel barrier contribution to the self-organized formation of ordered surface patterns on Ge(001). United States. https://doi.org/10.1103/physrevb.102.201404
Myint, Peco, Erb, Denise, Zhang, Xiaozhi, Wiegart, Lutz, Zhang, Yugang, Fluerasu, Andrei, Headrick, Randall L., Facsko, Stefan, and Ludwig, Karl F. Mon .
"Measurement of Ehrlich-Schwoebel barrier contribution to the self-organized formation of ordered surface patterns on Ge(001)". United States. https://doi.org/10.1103/physrevb.102.201404. https://www.osti.gov/servlets/purl/1737418.
@article{osti_1737418,
title = {Measurement of Ehrlich-Schwoebel barrier contribution to the self-organized formation of ordered surface patterns on Ge(001)},
author = {Myint, Peco and Erb, Denise and Zhang, Xiaozhi and Wiegart, Lutz and Zhang, Yugang and Fluerasu, Andrei and Headrick, Randall L. and Facsko, Stefan and Ludwig, Karl F.},
abstractNote = {Normal-incidence 1-keV Ar+ ion bombardment leads to amorphization and ultrasmoothing of Ge at room temperature, but at elevated temperatures the Ge surface remains crystalline and is unstable to the formation of self-organized nanoscale patterns of ordered pyramid-shaped pits. The physical phenomenon distinguishing the high-temperature patterning from room-temperature ultrasmoothing is believed to be a surface instability due to the Ehrlich-Schwoebel barrier for diffusing vacancies and adatoms, which is not present on the amorphous material. This real-time grazing-incidence small-angle x-ray scattering study compares smoothing of a prepatterned Ge sample at room temperature with patterning of an initially flat Ge sample at an elevated temperature. In both experiments, when the nanoscale structures are relatively small in height, the average kinetics can be explained by a linear theory. Furthermore, the linear theory coefficients, indicating surface stability or instability, were extracted for both experiments. A comparison between the two measurements allows estimation of the contribution of the Ehrlich-Schwoebel barrier to the self-organized formation of ordered nanoscale patterns on crystalline Ge surfaces.},
doi = {10.1103/physrevb.102.201404},
journal = {Physical Review B},
number = 20,
volume = 102,
place = {United States},
year = {Mon Nov 16 00:00:00 EST 2020},
month = {Mon Nov 16 00:00:00 EST 2020}
}
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