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Local step-flow dynamics in thin film growth with desorption

https://doi.org/10.1103/PhysRevMaterials.8.033403

Zhang, Xiaozhi ; Ulbrandt, Jeffrey_G ; Myint, Peco ; Fluerasu, Andrei ; Wiegart, Lutz ; Zhang, Yugang ; Nelson, Christie ; Ludwig, Karl_F ; Headrick, Randall_L ( March 2024 , Physical Review Materials)
In situ GISAXS observation of ion-induced nanoscale pattern formation on crystalline Ge(001) in the reverse epitaxy regime

https://doi.org/10.1103/PhysRevB.104.235434

Erb, Denise J. ; Myint, Peco ; Evans-Lutterodt, Kenneth ; Ludwig, Karl ; Facsko, Stefan ( December 2021 , Physical Review B)

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Coherent X-ray Spectroscopy Elucidates Nanoscale Dynamics of Plasma-Enhanced Thin-Film Growth

https://doi.org/10.1021/acsnano.3c07619

Myint, Peco ; Woodward, Jeffrey M. ; Wang, Chenyu ; Zhang, Xiaozhi ; Wiegart, Lutz ; Fluerasu, Andrei ; Headrick, Randall L. ; Eddy, Jr., Charles R. ; Ludwig, Jr., Karl F. ( January 2024 , ACS Nano)
Nanoscale kinetics and dynamics during Ar+ patterning of SiO2

https://doi.org/10.1103/PhysRevB.99.165429

Mokhtarzadeh, Mahsa ; Ulbrandt, Jeffrey G. ; Myint, Peco ; Narayanan, Suresh ; Headrick, Randall L. ; Ludwig, Karl F. ( April 2019 , Physical Review B)
Coherent X-ray measurement of step-flow propagation during growth on polycrystalline thin film surfaces

https://doi.org/10.1038/s41467-019-10629-8

Headrick, Randall L. ; Ulbrandt, Jeffrey G. ; Myint, Peco ; Wan, Jing ; Li, Yang ; Fluerasu, Andrei ; Zhang, Yugang ; Wiegart, Lutz ; Ludwig, Jr., Karl F. ( June 2019 , Nature Communications)

Abstract
The properties of artificially grown thin films are strongly affected by surface processes during growth. Coherent X-rays provide an approach to better understand such processes and fluctuations far from equilibrium. Here we report results for vacuum deposition of C₆₀on a graphene-coated surface investigated with X-ray Photon Correlation Spectroscopy in surface-sensitive conditions. Step-flow is observed through measurement of the step-edge velocity in the late stages of growth after crystalline mounds have formed. We show that the step-edge velocity is coupled to the terrace length, and that there is a variation in the velocity from larger step spacing at the center of crystalline mounds to closely-spaced, more slowly propagating steps at their edges. The results extend theories of surface growth, since the behavior is consistent with surface evolution driven by processes that include surface diffusion, the motion of step-edges, and attachment at step edges with significant step-edge barriers.

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