Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of implantation induced defects on the thermoelectric
  properties of ScN   Epitaxial 111 oriented ScN thin films deposited by magnetron sputtering were
implanted with argon ions at high fluences to introduce defects in order to
reduce the thermal conductivity and thus increase the thermoelectric figure of
merit. The films were investigated by structural, electrical, optical and
thermoelectric characterisation methods. The results show that argon
implantation leads to the formation of stable defects (up to 750 K operating
temperature) which are identified as interstitial type defect clusters and
argon-vacancy complexes. These defects induce acceptor-type deep levels in the
bandgap and reduce the free carrier mobility. The effect on the power factor
remains low due to the large drop in resistivity induced by the implantation
which is compensated by an increase of the absolute value of the Seebeck
coefficient. However, the thermal conductivity is strongly reduced by a factor
of 4 (3 W.m-1.K-1 at 300 K). Subsequent high temperature annealing, at 1573 K,
leads to the progressive evolution of defects: the clusters of interstitials
grow to the benefit of smaller ones and bubbles are formed. Thus, the number of
free carriers, the resistivity and the Seebeck coefficient are almost restored
but the mobility of the carriers remains low and a 30% drop in thermal
conductivity is still effective (8.5 W.m-1.K-1). In a more general way, this
study shows that the controlled introduction of defects as the
implantation-defect engineering can be an attractive method to enhance the
figure of merit of thermoelectric materials.

14
The categories of this paper are: math-ph
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
7
The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn