Investigation of the composition-structure-property relationship of AsxTe100x films prepared by plasma deposition

Optical Characterization of AsxTe100−x Films Grown by Plasma Deposition Based on the Advanced Optimizing Envelope Method

“…Besides, there are two halos in the XRD image from Figure 1 b, the stronger in the range of 2θ = 20–40°, and the weaker at 40–60°. The presence of these features presumably indicates presence of tellurium in the form of chains, and a small amount of AsTe 3/2 trigonal pyramidal structural units, as confirmed by Raman spectroscopy data in [ 38 ]. Furthermore, the As 80 Te 20 and As 98 Te 2 films also have amorphous structures revealed by similar XRD images.…”

“…The chemical composition and thickness of the films have been measured by energy-dispersive X-ray microanalysis (EDS) and scanning electron microscope (SEM) using JSM IT-300LV SEM of JEOL with an energy-dispersive attachment X-MaxN 20 of Oxford Instruments at high vacuum and an accelerating voltage of 20 kV. The compositions of the three studied films have been determined as As 40 Te 60 , As 80 Te 20 , and As 98 Te 2 in [ 38 ].…”

“…In this paper, three plasma deposited films As x Te 100–x are characterized based on using the AOEM and T ( λ = 300 to 3000 nm), accounting for the significant glass substrate absorption for λ > 2500 nm hindering accurate characterization. Description of the preparation and some composition–structure–property relationships for these glassy films were reported in [ 38 ], however data about their characteristics , ∆d, n ( λ ), and k ( λ ) have not been published, as As x Te 100–x films are insufficiently studied, in general. A simple approach is also proposed and employed for increasing the accuracy of computation of the extinction coefficient k ( λ ) of thin films, in comparison with its commonly used computation from T + ( λ ).…”

Monolayer AsTe2: Stable Robust Metal in 2D, 1D and 0D

“…As it is clearly seen from Figure , 2H‐ and 1T‐AsTe 2 monolayers are dynamically stable because all phonon modes have real eigenfrequencies; thus, it is shown that synthesis of both phases is possible as a free‐standing monolayer via bottom‐up approaches: chemical vapor deposition and atomic or molecular condensation methods, allowing the As and Te as precursors to grow in size . Furthermore, due to atomic masses, the phonon modes of 2H‐AsTe 2 and 1T‐AsTe 2 monolayers lie at low frequencies smaller than 200 cm −1 , which indicate that both of them are softer materials than other 2D materials such as MoS 2 , graphene, h‐BN .…”

“…It was shown that ‐As 2 Te 3 has ∼1 W m −1 K −1 thermal conductivity around room temperature which is lower than SiO 2 thin layer ,. Very recently, the PECVD synthesis and optical characterization of As−Te chalcogenide films were successfully done by Mochalov et al . It was found that the degree of transparency and the surface roughness of the deposited films increase with increasing of the Te content.…”