Optical and Dispersion Analysis of Zinc Selenide Thin Film

Desai, H. N.; Dhimmar, J. M.; Modi, B. P.

doi:10.1016/j.matpr.2016.04.055

Cited by 17 publications

(8 citation statements)

References 19 publications

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“…By using the band tail energy or Urbach energy (E urb ) value one can estimate the disorder level of the film structure. E urb value can be evaluated using the Urbach empirical relation [48], which is given by use the inverses slope of the liner plot of absorption coefficient ln(α) versus photon energy (hv) as presented in figure 7.…”

Section: Evaluation Of Urbach Energymentioning

confidence: 99%

Structure and optical properties of polycrystalline ZnSe thin films: validity of Swanepol’s approach for calculating the optical parameters

Hasaneen

Alrowaili

Mohamed

2020

Mater. Res. Express

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Ultrasonically cleaned glass slides are used as substrates for receiving the different thickness of Zinc selenide (ZnSe) films. The deposition processes of our investigated films were done at room temperature using physical thermal evaporation mechanism under vacuum ≈2×10 5 mbar. We investigated the optical and structural parameters of ZnSe thin films in correlation with film thickness (200-650 nm). Various techniques such as UV-vis-NIR spectrophotometer, x-ray diffraction lines and field emission scanning electron microscope were used to investigate aforementioned parameters. Structural analysis indicate that the films exhibited cubic preferred orientation along the plane (111) and the crystallinity and crystallite size of films increases linearly with film thickness. The optical band gap ranges from 2.69 to 2.81 eV and it is founded that it increases with film thickness. According to the applied Swanepoel's approach, it is possible to estimate the optical parameters and average thickness of the ZnSe thin films of different thicknesses with higher accuracy.

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Section: Evaluation Of Urbach Energymentioning

confidence: 99%

Structure and optical properties of polycrystalline ZnSe thin films: validity of Swanepol’s approach for calculating the optical parameters

Hasaneen

Alrowaili

Mohamed

2020

Mater. Res. Express

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“…Fig. 7 illustrates the plot of (n 2 -1) -1 as a function of (hm) 2 ing equation ( 2) [8]. The calculated values of dispersion parameters are also listed in Table 1 and found to decrease with increase of T S .…”

Section: Dispersion Propertiesmentioning

confidence: 92%

“…The optical constants, extinction coefficient (k) and refractive index (n) of SnS 0.7 Se 0.3 films were evaluated using appropriate formulae reported in literature [8] and their variation with wavelength is shown in Fig. 3 (a and b).…”

Section: Optical and Dielectric Constants And Optical Conductivitymentioning

confidence: 99%

“…The dielectric constant is one of the intrinsic properties of a material, which is directly proportional to the polarizability of that material. The real (e r ) and imaginary (e i ) parts of dielectric constant can be determined using n and k values following the relations, e r ¼ n 2 À k 2 and e i ¼ 2nk respectively [8]. Fig.…”

Section: Optical and Dielectric Constants And Optical Conductivitymentioning

confidence: 99%

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Optical and dispersion parameters of co-evaporated SnS0.7Se0.3 thin films

Saritha

Rasool

Reddy

et al. 2021

Materials Today: Proceedings

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Tin sulfoselenide (SnS 1-x Se x ) is a novel ternary semiconductor that belongs to the IV -VI group of compounds. It possesses the properties of both SnS and SnSe, which are proved as good absorber materials for solar cell fabrication. In the present work, SnS 0.7 Se 0.3 thin films were deposited by vacuum co-evaporation technique at four different substrate temperatures (T s ), 200°C, 250°C, 300°C and 350°C. The optical properties of as-deposited SnS 0.7 Se 0.3 films were analyzed using optical measurements. From the optical transmittance and reflectance data, the band gap energy of the layers was determined that varied in the range, 1.59-1.46 eV. The other optical parameters such as skin depth, refractive index, extinction coefficient, optical conductivity and dielectric constant of SnS 0.7 Se 0.3 layers were determined and discussed as a function of substrate temperature. Moreover, the dispersion parameters of the layers were also evaluated using Wemple -DiDomenico (WDD) single oscillator model. The dispersion energy (E d ) and oscillator energy (Ε o ) of the films were evaluated and varied in the range, 2.19-2.38 eV and 7.55-9.52 eV respectively. Moreover, the optical dispersion moments (M À1 and M À3 ) were also calculated that were varied from 0.25 to 0.29 and from 2.76 Â 10 -3 to 5.08 Â 10 -3 respectively.

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“…ZnSe, with a wide band gap of about 2.7 eV in the bulk material and much less toxicity than CdSe or CdS, has been identified as a promising blue-light-emitting material to replace ZnO. Based on the properties of a wide band gap and excellent luminescence efficiency, ZnSe has been widely used in transistors, lasers, solar cells, photodetectors, blue-light-emitting diodes, etc.…”

Section: Introductionmentioning

confidence: 99%

Cadmium-Free Nanostructured Multilayer Thin Films with Bright Blue Photoluminescence and Excellent Stability

Luo

Wang

et al. 2021

ACS Omega

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Cadmium-based quantum dots (Cd-QDs) show decent performance for lighting applications due to good color saturation, an excellent high quantum yield, and a narrow full-width at half-maximum. However, the intrinsic toxicity of Cd is a major hindrance to related applications, especially in the biological field. ZnSe, with a band gap of 2.7 eV and lower toxicity than CdSe or CdS, is promising as a blue luminescent material. Herein, we mainly reported the preparation and luminescence properties of nanostructured ZnSe/ZnS multilayer thin films with bright blue photoluminescence. The photoluminescence spectrum contained two emission peaks, located at about 442 nm (near band-edge emission) and 550 nm (defect-related emission), respectively. More importantly, the photoluminescence performance and decay were explored in detail through low-temperature photoluminescence spectra. In addition, the nanostructured ZnSe/ZnS multilayer thin films showed favorable photostability.

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Optical and Dispersion Analysis of Zinc Selenide Thin Film

Cited by 17 publications

References 19 publications

Structure and optical properties of polycrystalline ZnSe thin films: validity of Swanepol’s approach for calculating the optical parameters

Structure and optical properties of polycrystalline ZnSe thin films: validity of Swanepol’s approach for calculating the optical parameters

Optical and dispersion parameters of co-evaporated SnS0.7Se0.3 thin films

Cadmium-Free Nanostructured Multilayer Thin Films with Bright Blue Photoluminescence and Excellent Stability

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