Effect of GLAD technique on optical properties of ZnS multilayer antireflection coatings

Tajik, N.; Ehsani, M.H.; Moghadam, R. Zarei; Dizaji, H. Rezagholipour

doi:10.1016/j.materresbull.2017.12.037

Cited by 16 publications

(3 citation statements)

References 35 publications

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“…The majority of the GLAD literature focuses on face-centered-cubic (FCC), body-centered-cubic (BCC) and their compounds [ 7 , 9 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. In contrast, hexagonal close-packed (HCP) metals and their compounds have not received as much attention despite the many beneficial properties they possess.…”

Section: Introductionmentioning

confidence: 99%

Branching of Titanium Nanorods

Yussuf

Huang

2021

Nanomaterials

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One dimensional titanium nanorod structures formed by glancing angle physical vapor deposition have branches while other hexagonal closed packed metals do not. Based on physical vapor deposition and characterizations using electron microscopy and X-ray diffraction, this paper reports that Ti nanorod branching occurs at a low homologous temperature of 0.28. The side surface of the nanorods consists of {101¯1} facets arranged in a zigzag shape. Further, branches form on the {101¯1} side facets that are parallel to the deposition flux. The length of the branches increases as they are farther away from the nanorod top and tend to reach a constant. The top surface facet of Ti nanorods is {0001} and that of the branches is {101¯1}. The insight into conditions for branching, together with the determination of the morphology and crystal orientation of the branches, lay the foundation for further studies of branching mechanisms and driving force.

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Section: Introductionmentioning

confidence: 99%

Branching of Titanium Nanorods

Yussuf

Huang

2021

Nanomaterials

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“…One pervasive technique that is associated with thermal evaporation deposition is glancing angle deposition (GLAD) technique by which, remarkable morphological changes occur that result in optical properties changes [27][28][29][30]. In this technique, the substrate is situated at α angle with respect to the source normal, leading to the shadowing effect [27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

Zarei

Ehsani

Dizaji

2020

Mater. Res. Express

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In this paper, Zinc Telluride (ZnTe) thin films have been deposited on glass substrate by glancing angle deposition (GLAD) technique at different flux angles. The structural and optical properties of the prepared specimens have been studied with the help of x-ray diffraction (XRD), FESEM, and UV-vis analyses, respectively. According to these tests, remarkable changes in the morphology and the structure of the as-prepared samples have occurred. More significantly, using UV-vis analysis the optical properties including refractive index and band gap energy of the samples have been modified at higher deposition angles, which are promising to be applicable in optoelectronic devices.

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“…This defect absorption reduced with the increase in thickness and hence the bandgap shifted towards the higher value (≅3.5 eV). A few other researchers have reported similar variation . The deviation in the bandgap resulting from the fine grain structure of the films can be understood by quantum size effect .…”

Section: Optical Propertiesmentioning

confidence: 58%

Analysis of microstructural properties, energy band structure, and defect levels of ZnS films obtained from micro‐controlled SILAR method

Ashith

Rao

2018

Surface & Interface Analysis

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Zinc sulphide (ZnS) thin films were deposited on glass substrate by micro-controllerbased successive ion layer adsorption and reaction method using ZnCl 2 as a precursor.The films were found to be polycrystalline. The crystallite size of the films increased with the increase in both precursor concentration and immersion cycles. The increased crystallite size resulted in the reduction of grain boundary defects which, in turn, improved the electrical properties of the films. The energy band structure of the films was analysed using absorbance and photoluminescence spectra. The films displayed strong absorption for wavelengths less than 400 nm indicating the presence of a wide bandgap with shallow defect levels near the band edges. The bandgap of the films was estimated to be between 3.3 and 3.5 eV. The photoluminescence spectra of the films exhibited a prominent excitonic peak at around 3.33 eV. The defect level emissions were observed at around 3.1, 2.92, 2.76, and 2.64 eV. These emissions were attributed to the transitions from localized zinc and sulphur vacancy levels and interstitial states. An energy band diagram of the films was drawn based on the result of optical and photoluminescence studies.

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Effect of GLAD technique on optical properties of ZnS multilayer antireflection coatings

Cited by 16 publications

References 35 publications

Branching of Titanium Nanorods

Branching of Titanium Nanorods

An investigation on structural and optical properties of nanocolumnar ZnTe thin films grown by glancing angle technique

Analysis of microstructural properties, energy band structure, and defect levels of ZnS films obtained from micro‐controlled SILAR method

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