The effect of film thickness on the optical absorption edge and optical constants of the Cr(III) organic thin films

Yakuphanoğlu, F.; Şekerci, Memet; Balaban, A.

doi:10.1016/j.optmat.2004.07.015

Cited by 85 publications

(30 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the electric area formed in the UV region has considerably affected dielectric constant. Moreover, thick film contains more particle, which leads to an increase on the absorption and some increases may be observed on the dielectric constant 9 . According to the literature, such a material with these optical properties is quite useful in semi-conductor technology 10 .…”

Section: Sem Título1mentioning

confidence: 99%

The Production of UV Absorber Amorphous Cerium Sulfide Thin Film

Kariper

2017

Mat. Res.

View full text Add to dashboard Cite

This study investigates the production of cerium sulfide (CeS x ) amorphous thin films on substrates (commercial glass) by chemical bath deposition at different pH levels. The transmittance, absorption, optical band gap and refractive index of the films are measured by UV/VIS Spectrum. According to XRD analysis, the films show amorphous structure in the baths with pH: 1 to 5. It has been observed that the optical and structural properties of the films depend on pH value of the bath. The optical band gap (2.08 eV to 3.16 eV) of the films changes with the film thickness (23 nm to 1144 nm). We show that the refractive index has a positive relationship with the film thickness, where the values of 1.93, 1.45, 1.42, 2.60 and 1.39 are obtained for the former, and 34, 560, 509, 23 and 1144 nm (at 550 nm wavelength) for the latter. We compare the optical properties of amorphous and crystal form of CeS x thin films. We show that the optical band gaps of the amorphous CeS x are lower than that of crystal CeS x .

show abstract

Section: Sem Título1mentioning

confidence: 99%

The Production of UV Absorber Amorphous Cerium Sulfide Thin Film

Kariper

2017

Mat. Res.

View full text Add to dashboard Cite

show abstract

“…This result indicates that the dopant atoms of BCG will modify the structure of the host polymer [13]. BCG dopant has increased the absorbance in the visible region In addition, the optical conductivity (σ opt) can be obtained from the equation as [14]. σ opt =…”

Section: Resultsmentioning

confidence: 99%

“…Figure-9 shows that the values of energy gap decrease with increasing of the dye concentration. This decrease can be attributed to the creation of the site levels in forbidden indirect energy gap leading to facilitate the crossing of electron from the valence band to the local levels to conduction band [14]. …”

Section: Almusawe Et Almentioning

confidence: 99%

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Almusawe

Hassen

Rahma

et al. 2018

ijs

View full text Add to dashboard Cite

In this study, we investigated the effect of Bromocresol green dye (BCG) of the PMMA thin films optical properties. Films of Poly Methyl Methacrylate doped by 10% BCG doping ratio to prepared two concentrations 2x10 -4 and 6x10 -4 M of PMMA-BCG dye were deposited on glass substrate using free casting method at room temperature. The optical properties of the films were determined using UVVisible absorbance and transmittance spectra at the 300 -900 nm wavelength range. The linear absorption coefficient and the extinction coefficient were calculated. The results showed that the optical properties were increasing by increasing the dye concentration, while the optical energy gap was decreasing with the doping. Also from the linear optical properties result the PMMA-BGC thin films are a promised materials for nonlinear optics applications. ISSN: 0067-2904Almusawe et al. Science, 2018, Vol. 59, No.1B, pp: 299-306 Iraqi Journal of 300 IntroductionOrganic dye doped polymers have a great deal of concern in recent years due to their great potential in many important applications such as optical storage, optical switching, optical limiting, signal processing, optical modulators, holography and nonlinear optical devices as well as various kinds of photonic devices [1][2][3]. The unique properties of polymers such as low density, ability to form intricate shapes, good mechanical strength versatile, electrical properties and low manufacturing cost made them promising materials that have been successfully used as host matrices for dyes. The wide range of polymer applications can be even more extensive by incorporation of filler into polymer matrix, because dispersed filler may increase the concentration of absorptive or fluorescence centers as well as the opto-chemical and opto-physical stability of host polymer [4][5][6][7].In this study, we present the effect of Bromocresol green dye (BCG) on the optical properties of poly methyl methacrylate (PMMA) polymeric matrix (guest -host system). Poly methyl methacrylate (PMMA) is a transparent plastic material with high solidity, durability and flexibility [6].The optical properties such as absorption coefficient, refractive index and optical energy band gap of dye doped polymers were investigated using spectroscopic absorbance combined with transmittance measurements. Materials and Samples PreparationThe Bromocresol green dye was obtained from (Sigma -Aldrich) with a molecular formula of C 21 H 14 Br 4 O 5 S and its chemical structure is depicted in Figure-1. The bromo group can improve the transparency and the thermal stability of compounds. Bromocresol Green (BCG) is a pH sensitive triphenylmethane dye useful in a variety of colorimetric detection technologies. BCG is used as a tracking dye for DNA agarose gel electrophoresis, in protein determinations and in charge-transfer complexation processes, BGC melting point is 225 o C and the peak absorption in 423 nm [8,9]. Poly methyl methacrylate (PMMA) polymer was purchased from (Sigma -Aldrich) and used as host material ...

show abstract

“…These bonds are responsible for the formation of some defects producing localized states in the films. The thicker films increase the width of the localized states in the optical absorption edge or band gap; consequently the optical absorption edge decreases with increase in thickness [37]. The deviation in the band gap can also be due to the excess of unbound Te present in the ZnTe films.…”

Section: Resultsmentioning

confidence: 99%

Structural, optical and nanomechanical properties of (1 1 1) oriented nanocrystalline ZnTe thin films

Kiran

Kshirsagar

Krishna

et al. 2010

Eur. Phys. J. Appl. Phys.

View full text Add to dashboard Cite

Abstract. Structural, optical and nanomechanical properties of nanocrystalline Zinc Telluride (ZnTe) films of thickness upto 10 microns deposited at room temperature on borosilicate glass substrates are reported. X-ray diffraction patterns reveal that the films were preferentially oriented along the (1 1 1) direction. The maximum refractive index of the films was 2.74 at a wavelength of 2000 nm. The optical band gap showed strong thickness dependence. The average film hardness and Young's modulus obtained from loaddisplacement curves and analyzed by Oliver-Pharr method were 4 and 70 GPa respectively. Hardness of (1 1 1) oriented ZnTe thin films exhibited almost 5 times higher value than bulk. The studies show clearly that the hardness increases with decreasing indentation size, for indents between 30 and 300 nm in depth indicating the existence of indentation size effect. The coefficient of friction for these films as obtained from the nanoscratch test was ∼0.4.

show abstract

The effect of film thickness on the optical absorption edge and optical constants of the Cr(III) organic thin films

Cited by 85 publications

References 7 publications

The Production of UV Absorber Amorphous Cerium Sulfide Thin Film

The Production of UV Absorber Amorphous Cerium Sulfide Thin Film

Linear Optical Properties of Bromocresol Green Dye Doped Poly Methyl Methacrylate Thin Films

Structural, optical and nanomechanical properties of (1 1 1) oriented nanocrystalline ZnTe thin films

Contact Info

Product

Resources

About