Annealing-induced optical and sub-band-gap absorption parameters of Sn-doped CdSe thin films

Design of Sn-doped cadmium chalcogenide based monolayers for valleytronics properties

“…The electronic band structures for Sn-doped CdX monolayers without the inclusion of SOC (figure 3) reveal that all monolayers are indirect band gap semiconductors with increased band gap values than their pristine counterparts, as given in table S2 in the SI. This observation contradicts the experimental band gaps reported in the literature [14][15][16]. However, the experiments are not for monolayers and have only 2%-5% Sn-doping.…”

“…We have then doped Sn in CdX monolayers by substitution at the Cd site, as shown in figure 1(b). It may be noted that the experimental study by Sahu et al of tin-incorporated nanocrystalline CdSe thin films reported the structure to be the (111) plane of a cubic ZB structure [15] and Kaur and Tripathi observed that Sn 2+ ions substitute Cd 2+ in the CdSe lattice [14]. A 2 × 2 planar unit cell is shown in figures 1(a) and (b) for the pristine and Sn-doped monolayers, respectively.…”

“…Son et al used a soft template method to synthesize free-standing single layered lamellarstructured CdSe nanosheets with the diffraction pattern showing growth along [000 1] and [1 100] axes of the hexagonal wurtzite (W) structure [13]. Kaur and Tripathi prepared Sndoped CdSe thin films on glass substrate by thermal evaporation, which showed characteristic x-ray diffraction peaks of the (100) plane of the W structure [14]. They also concluded from x-ray diffraction studies that Sn 2+ ions substitute Cd 2+ ions in the CdSe lattice.…”

A review on metal-doped chalcogenide films and their effect on various optoelectronic properties for different applications

“…20 Such as the Sn as an impurity enhanced optical and electronic properties by permitting the absorption edge shi with the change in refractive index, optical conductivity, dielectric constant and greatly varies the optical bandgap, thereby facilitating the possibilities of optoelectronic applications. 21,22 However, the doping of impurity silver atom (Ag) into chalcogenide systems causes variations in their properties by increasing their network connectivity structure, enhancing their chemical and thermal stability, and increasing the electrical conductivity of the system. 23,24 Additionally, silver is a more reective and soluble metal in chalcogenide alloys.…”

“…Also, the appearance of localized states over the bandgap region and the non-appearance of long-range order makes chalcogenide materials show excellent tuning properties when exposed to external stimuli effects like doping effects and photo-induced effects, thermally annealed effects, etc. 3–27…”