Let
p be a prime and
Fq be the finite field of order
q=pm. In this paper, we study
FqR-skew cyclic codes where
R=Fq+uFq with
u2=u. To characterize
FqR-skew cyclic codes, we first establish their algebraic structure and then discuss the dual-containing properties by considering a non-degenerate inner product. Further, we define a Gray map over
FqR and obtain their
Fq-Gray images. As an application, we apply the CSS (Calderbank-Shor-Steane) construction on Gray images of dual containing
FqR-skew cyclic codes and obtain many quantum codes with better parameters than the best-known codes available in the literature.