A theory of growing crystalline nanorods – Mode Ⅰ

Du, Feng; Huang, Hanchen

doi:10.1016/j.susc.2018.03.016

A theory of growing crystalline nanorods – Mode Ⅰ

Journal Article · Tue Mar 27 00:00:00 EDT 2018 · Surface Science

DOI:https://doi.org/10.1016/j.susc.2018.03.016· OSTI ID:1538867

Du, Feng ^[1]; Huang, Hanchen ^[2]

Northeastern University, Boston, MA (United States); DOE/OSTI
Northeastern University, Boston, MA (United States)

Nanorods grow in two possible modes during physical vapor deposition (PVD). In mode I, monolayer surface steps dictate the diameter of nanorods. In mode II, multiple-layer surface steps dictate the diameter, which is the smallest possible under physical vapor deposition [5,10]. Here this paper reports closed-form theories of terrace lengths and nanorod diameter during the growth in mode I, as a function of deposition conditions. The accompanying lattice kinetic Monte Carlo simulations verify these theories. This study reveals that (1) quasi-steady growth exists for each set of nanorod growth conditions, and (2) the characteristic length scales, including terrace lengths and nanorod diameter at the quasi-steady state, depend on the deposition conditions – deposition rate F, substrate temperature T, and incidence angle θ – only as a function of l_2D/tan θ, with l2D = 2($$\frac{v_{2D}}{F cos θ}$$)$$^\frac{1}{3}$$ as a diffusion-limited length scale and v_2D as the atomic diffusion jump rate over monolayer surface steps.

View Accepted Manuscript (DOE)

Research Organization:: Northeastern University, Boston, MA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014035

OSTI ID:: 1538867

Alternate ID(s):: OSTI ID: 1548536

Journal Information:: Surface Science, Journal Name: Surface Science Journal Issue: C Vol. 674; ISSN 0039-6028

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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