Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Substrate effects and diffusion dominated roughening in Cu2O
  electrodeposition   Cuprous oxide (Cu2O) films from 25 nm to 1500 nm were electrodeposited on
n-Si(100) and Ni/n-Si(100) substrates from aqueous solution at room
temperature. X-ray diffraction and transmission electron microscopy imaging
show that the Cu2O structure and morphology is strongly affected by the
substrate choice, with V shape and U shape columnar growth on n-Si(100) and
Ni/n-Si(100), respectively. Atomic force microscopy reveals the presence of
rounded grains at the surface in both cases. Anomalous and normal roughening
are observed in films grown on n-Si and Ni, respectively, but estimates of
scaling exponents are not conclusive. On the other hand, the distributions of
local heights, roughness, and extremal heights show good agreement with those
of the fourth order linear stochastic equation of Mullins and Herring (MH).
Thus, surface dynamics in both systems is dominated by diffusion of adsorbed
molecules, with no large scale effect of possible inhomogeneities in mass flux
from the solution or in reaction and adsorption rates. In growth on n-Si
substrates, the noise amplitude of the MH equation increases in time as
t^{0.8}, while the coefficient of the curvature-related term is
time-independent. Step edge energy barriers restrict the mass flux across grain
boundaries, thus a broad size distribution of initial grains leads to
coarsening of the larger ones. This explains their V shape in the thickest
films and establishes a connection with the anomalous roughening. These effects
are reduced in films grown on Ni/n-Si, which initially have much larger grains
with narrower size distributions and, consequently, smaller fluctuations in
coarse grained growth rates.

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The categories of this paper are: eess
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: stat