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Title: Coherent X-ray measurement of step-flow propagation during growth on polycrystalline thin film surfaces

Journal Article · · Nature Communications

The properties of artificially grown thin films are strongly affected by surface processes during growth. We demonstrate that the use of coherent X-rays provides an approach to better understand such processes and fluctuations far from equilibrium. In these experiments, vacuum deposition of C60 on a graphene-coated surface is 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 on the growth surface 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 during steady-state dynamics, since the behavior is consistent with surface evolution driven by processes spanning multiple length and time scales, including surface diffusion, the motion of fluctuating step-edges, and attachment at step edges with significant step-edge barriers.

Research Organization:
Univ. of Vermont, Burlington, VT (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
SC0017802; DMR-1709380; SC0012704
OSTI ID:
1619523
Alternate ID(s):
OSTI ID: 1594847; OSTI ID: 1706604
Report Number(s):
BNL-220577-2020-JAAM; arXiv:1810.11585; TRN: US2100970
Journal Information:
Nature Communications, Vol. 10, Issue 1; Related Information: https://static-content.springer.com/esm/art%3A10.1038%2Fs41467-019-10629-8/MediaObjects/41467_2019_10629_MOESM1_ESM.pdf; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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