Two-dimensional tin disulfide (SnS2) is attracting
attention
from researchers in various fields due to its physical, optical, and
electrical properties. In addition, research suggests that SnS2 doped with various metals can be used in a wide range of
applications. However, few studies of the doping process in tin sulfide
thin films with various doping concentrations using atomic layer deposition
(ALD) and the super-cycle method have been published. Here, we describe
the deposition of pristine SnS2 using ALD and analyze crystallinity,
chemistry, and optical and electrical properties of SnS2 doped with various concentrations of zinc by controlling the ratio
of SnS2 and ZnS using super-cycle recipes. As the doping
concentration increased, a cubic-phase ZnS layer was formed, and chemical
binding energies increased, revealing an n-type doping effect. As
the doping concentration increased, the transmittance of the thin
film increased by up to 80.5%, and the optical band gap increased
to 3.43 eV. In addition, the valence-band edge energy increased up
to 2.02 eV, and n-type characteristics appeared as the doping concentration
of zinc increased as determined by calculation of the electronic band
structure. These zinc-doped nanoscale SnS2 materials have
potential for optoelectronic applications.