Optical and structure properties of CdTe/CdS films under influence of both CdCl2 heat treatment and (O2 + Ar) atmosphere

Hasaneen, M.F.; Taya, Yoshihiro; Ali, H.M.; Ahmed, Mahrous R.

doi:10.1007/s00339-020-03688-y

Cited by 18 publications

(7 citation statements)

References 42 publications

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“…Particularly, interference occurred due to the difference in the refractive index of the CdTe films and substrate and/or interference of multiple light reflections that occurred during the measurement. 49 It could also be seen that the absorption edges of the transmittance spectra shifted toward a higher wavelength region due to the thermal treatment indicate the decrease of the optical bandgap of the films. Hence, the optical bandgap has been estimated according to the Tauc relation, 30 where the absorption coefficient is…”

Section: Resultsmentioning

confidence: 93%

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

et al. 2021

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A detailed comparative analysis using alternative Cl compounds such as InCl 2 , MgCl 2 , SnCl 2 , and ZnCl 2 along with CdCl 2 was conducted in this study to assess their viability for the thermal treatment of ultrathin CdTe films. Similar or even better structural and electrical properties were found upon using InCl 2 , MgCl 2 , and ZnCl 2 in thermal treatment than the conventional CdCl 2 . The film's bandgap is found to reduce upon the thermal treatment which varied in the range of 1.44-1.50 eV. A low amount of metal doping occurred in films' surfaces upon thermal treatment and influence the carrier concentration which varied from 7.32 × 10 15 -1.76 × 10 17 /cm 3 . The viability of the alternate materials was also investigated through the device simulation. All investigated results indicated that MgCl 2 and ZnCl 2 can be used in the current manufacturing technique instead of traditional CdCl 2 , which could reduce the environmental risk and production cost.

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Section: Resultsmentioning

confidence: 93%

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

et al. 2021

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“…The thermoelectric power measurements were carried out by means of a home-built set-up published in our previous work [23,24]. In addition, the optical properties were carried out using double beam UV-visible-NIR spectrometer model: Jasco V-570 (with photometric accuracy of ±0.0021-0.0042 absorbance and ±0.31% transmittance and wavelength range between 400 and 2500 nm at normal incident) [25].…”

Section: Experimental Methodsmentioning

confidence: 99%

Structural, electrical and optical properties investigation of nano-sized Sb_0.1(SnO₂)_0.9

Mohamed¹,

Ahmed²,

Ali³

et al. 2022

Phys. Scr.

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Solid state reaction method are used to prepare Sbx(SnO2)1-x (x=0 and 0.1) with sintering temperatures, 600oC and 800oC. The crystallographic properties of undoped and doped SnO2 materials results showed the tetragonal rutile structure of SnO2. The crystallinity was clear and increased with increasing the heat treatment. For the most diffraction peaks the microstrain is negative because do˂ds indicating the generation of residual compressive stress in the surface. Rietveld refinement proved that a good fitting parameters Rp, Rwp, and χ2 makes the derived samples to be in a high quality, especially Sb0.1(SnO2)0.9 sample. Scanning Electron Microscopy (SEM) indicated that a spherical shape of SnO2 with nanoparticles but plates and nanorods shaped of SnO2 were detected for Sb0.1(SnO2)0.9 compound that was sintered at 800°C. SnO2 has grain size 67 nm and 86 nm at sintering temperatures 600°C and 800°C respectively, but after adding Sb the grain size decreases to be ≈44 nm at the same sintering temperatures. The electrical resistivity, ρ, of Sb0.1(SnO2)0.9 behaved as semiconductor-like. The magnetoresistance, MR, results showed that ρ(0.6 tesla) < ρ(0 tesla) at Tsint=600oC where ρ (0.6 tesla) > ρ (0 tesla) at Tsint=800°C because the crystallinity increased with increasing of the sintering temperatures. The results of seebeck showed that charge carriers are n-tape at Tsint=600°C and p-type at Tsint=800°C. The optical energy band, Eg of Sb0.1(SnO2)0.9 which were 2.49 eV and 3.21 eV at Tsint= 600°C and 800°C respectively and the high values of the transmittance make this compound is candidate to work as window layer in solar cell applications. The results of susceptibility denotes that the Sb0.1(SnO2)0.9 compound is a paramagnetic material.

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“…According to [27,31,32], N and refractive index of the substrate (S sub ) are determined as follows:…”

Section: Morphological and Compositional Analysismentioning

confidence: 99%

Effect of copper and silver as a middle layer on the structural, electrical, photocatalytic, and optical properties of ZnS/metal/ZnS films for optoelectronics applications

2023

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In this work, we utilized the thermal vacuum evaporation technique to fabricate ZnS single-layer thin films, ZnS/Cu/ZnS (ZCZ), and ZnS/Ag/ZnS (ZAZ) multilayer thin films. The influence of the middle layer of metals like copper and silver on the physical properties of ZnS/metal/ZnS multilayers is investigated. The results of the X-ray investigation demonstrate that the samples are polycrystalline, with a cubic ZnS structure and texture (111) at 2 = 29.1°. The optical investigation using Tauc's approach yields energy gap values of 3.76 eV, 3.68 eV, and 3.6 eV for ZnS, ZCZ, and ZAZ films, respectively. CO2 gas sensing efficiency of ZnS, ZCZ, and ZAZ films were found to be at different operating temperatures. The optimal temperatures for ZnS, ZCZ, and ZAZ thin films were determined to be 483 K, 693 K, and 693 K, respectively. Under ultraviolet (UV) irradiation, the photocatalytic activity of ZnS, ZCZ, and ZAZ films for the degradation of methylene blue were studied. The results suggest that the metal intermediate layer is significant in improving the photocatalytic capabilities of ZnS films. When compared to ZnS single layer film (degradation efficiency of 15% after 180 minutes of UV irradiation), ZAZ multilayer film demonstrates the highest photocatalytic activity (degradation efficiency of 50% after 180 minutes of UV irradiation). The mechanism of the metal middle layer's improved UV photoactivity is briefly discussed.

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Optical and structure properties of CdTe/CdS films under influence of both CdCl2 heat treatment and (O2 + Ar) atmosphere

Cited by 18 publications

References 42 publications

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

Structural, electrical and optical properties investigation of nano-sized Sb_0.1(SnO₂)_0.9

Effect of copper and silver as a middle layer on the structural, electrical, photocatalytic, and optical properties of ZnS/metal/ZnS films for optoelectronics applications

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Optical and structure properties of CdTe/CdS films under influence of both CdCl2 heat treatment and (O2 + Ar) atmosphere

Cited by 18 publications

References 42 publications

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

The viability of alternative and nontoxic chlorine containing compounds for thermal treatment of ultrathin CdTe (≤1.0 μm) films

Structural, electrical and optical properties investigation of nano-sized Sb0.1(SnO2)0.9

Effect of copper and silver as a middle layer on the structural, electrical, photocatalytic, and optical properties of ZnS/metal/ZnS films for optoelectronics applications

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Structural, electrical and optical properties investigation of nano-sized Sb_0.1(SnO₂)_0.9