Optical properties of high refractive index thin films processed at low-temperature

Oubaha, Mohamed; Elmaghrum, Salem; Copperwhite, R.; Corcoran, Brian; McDonagh, Colette; Gorin, Arnaud

doi:10.1016/j.optmat.2012.02.023

Cited by 55 publications

(28 citation statements)

References 23 publications

(34 reference statements)

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“…This result is in agreement with literature values (2.15 eV for chloroform and 2.12 eV for toluene) [25]. Refractive index (n) is one of the fundamental properties for an optical material, because it is closely related to the electronic polarizability of ions and the local field inside materials [54,55], and it is an important parameter for optical, optoelectronic and photovoltaic applications, because high refractive index (n) thin film materials (typically [1.65) [56] are generally used to improve the performance of optical and photovoltaic devices in many technologies such as solar cells [41], Bragg gratings [44], photonic crystals [57] and waveguide-based optical circuits [58]. The complex optical refractive index is expressed as,…”

Section: The Effects On Optical Parameters Of the Mdmo-ppv Polymer Ofsupporting

confidence: 89%

Optical properties of poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] light-emitting polymer solutions: effects of molarities and solvents

Gündüz

2015

Polym. Bull.

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The optical properties of the solutions of the MDMO-PPV light-emitting polymer were investigated. The maximum mass extinction coefficient values of the solutions of the MDMO-PPV for 6.640 and 3.014 µM were found to be 20.874 and 42.009 L g −1 cm −1 , respectively. The absorption band edge values of the solutions of the MDMO-PPV shifted from 2.149 to 1.987 eV with increasing molarity. To obtain lower E g values (2.020, 2.057, 2.083, 2.088 and 2.103 eV, respectively) of the MDMO-PPV can be preferred xylene, toluene, chlorobenzene, chloroform and tetrahydrofuran solvents, respectively. The E g of the solution of the MDMO-PPV was decreased with molarities and solvents. The refractive index values of the MDMO-PPV were controlled with various solvents. The optical parameters such as single oscillator energy, dispersion energy, M −1 , M −3 moments, optical oscillator strengths, linear static refractive index, optical linear susceptibility, third-order nonlinear susceptibility and nonlinear refractive index were calculated using Wemple-DiDomenico equation. The highest contrast was obtained with xylene, while the lowest contrast was obtained with chlorobenzene. The MDMO-PPV can be used in the fabrication of the metal-semiconductor contacts due to low optical band gap and suitable optical parameters. Also, the surface morphology properties of the MDMO-PPV polymer film were investigated.

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Section: The Effects On Optical Parameters Of the Mdmo-ppv Polymer Ofsupporting

confidence: 89%

Optical properties of poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] light-emitting polymer solutions: effects of molarities and solvents

Gündüz

2015

Polym. Bull.

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“…This could be interpreted in terms of the presence of institutional additives as more Fe-Ni content is introduced in the films that increases the reflectance. Moreover, the surge in the refractive index of Fe-Ni co-doped ZnO thin films can be attributed to the solidification of smaller ions into larger collections [62]. Fabrication and modulation of optical devices such as, optical buttons and filters require full determination of complex refractive index (N = n + ik) and complex dielectric functions (ε = ε 1 + iε 2 ) [53].…”

Section: Optical Characterization Analysismentioning

confidence: 99%

Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

et al. 2020

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Sol-gel technique is used to synthesize as-grown zinc oxide (ZnO) and iron-nickel (Fe-Ni) co-doped ZnO thin films deposited on glass substrates using dip coating technique. The structural properties and crystal imperfections of as-prepared thin films are investigated. We performed the structural analysis of films using X-ray diffraction (XRD). The XRD analysis reveal that the as-prepared films exhibit wurtzite structure. Furthermore, XRD-line profile analysis is performed to study the correlation between structural properties and imperfections of the nanocomposite thin films. The crystallite size and microstrains parameters are predicted using the Williamson–Hall method. We found that the crystallites size increases as the co-doped (Fe-Ni) concentration is increased. However, microstrains of the nanocomposite films decreases as (Fe-Ni) concentration is increased. The optical properties of the (Fe-Ni) co-doped nanocomposite films are investigated by performing UV-Vis (250 nm–700 nm) spectrophotometer measurements. We found that as the (Fe-Ni) concentration level is steadily increased, transmittance of the undoped ZnO thin films is decreased. Remarkably, refractive index of undoped ZnO thin films is found to exhibit values extending from 1.55 to1.88 that would increase as (Fe-Ni) concentration is increased.

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“…This suggests that the absorption band edge value of the poly(PNPMMA) thin film is 1.61 eV. The refractive index (n) is an important parameter for optical and photovoltaic applications, because high refractive index (n) thin film materials (typically > 1 65 31 are generally used to improve the performance of optical and photovoltaic devices in many technologies such as waveguide-based optical circuits, 32 photonic crystals, 33 Brag gratings, 34 and solar cells. 35 Thus, it is important to determine optical constants of the poly(PNPMMA).…”

Section: Optical Properties Of Poly(pnpmma)mentioning

confidence: 99%

Determination of optical constants of poly(<I>N</I>-phthalimidomethyl methacrylate)

Kaya¹,

Gündüz²

2015

Mat Express

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The polymer of N-phthalimidomethyl methacrylate (PNPMMA) was synthesized by free radical polymerization. The poly(PNPMMA) is significant material, because it is a soluble material. The poly(PNPMMA) exhibits a low transmittance behavior in the visible region. The band gap of the poly(PNPMMA) thin film was found to be 1.62 eV. The refractive index value of the poly(PNPMMA) varies between 3.00 and 1.56. The plot of refractive index is composed of two regions so-called normal and abnormal dispersion. We calculated many optical parameters such as average transmittance, absorption band edge, refractive index, incidence and refraction angle, direct and indirect band gap, real and imaginary parts of dielectric constant, real part and imaginary parts of the optical conductivity of the poly(PNPMMA). The poly(PNPMMA) is a semiconductor and it can be used in the fabrication of the metal-semiconductor (MS) contacts like Schottky diode due to low optical band gap and suitable optical contacts and it is significant material in applications of some devices such as an image sensor packaging structure and high intensity medium-pressure lamps due to low transmittance values in the visible region.

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Optical properties of high refractive index thin films processed at low-temperature

Cited by 55 publications

References 23 publications

Optical properties of poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] light-emitting polymer solutions: effects of molarities and solvents

Optical properties of poly[2-methoxy-5-(3′,7′-dimethyloctyloxy)-1,4-phenylenevinylene] light-emitting polymer solutions: effects of molarities and solvents

Optical, Structural, and Crystal Defects Characterizations of Dip Synthesized (Fe-Ni) Co-Doped ZnO Thin Films

Determination of optical constants of poly(<I>N</I>-phthalimidomethyl methacrylate)

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