Dielectric Properties of Coronene Film Deposited onto Silicon Substrate by Spin Coating for Optoelectronic Applications

Akın, Ümmühan; Yüksel, Ömer Faruk; Tuğluoğlu, Nihat

doi:10.1007/s12633-021-01017-3

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…Alternatively, the inferred high ò r values may be indicative of a high-dielectric and modest-loss material such as planetary-relevant polymers (Thompson & Squyres 1990) and ices, like water-ammonia ices (Lorenz 1998), with ò r ∼ 5. For example, Hamill et al (2020) found that the spatial boundaries of the MLA dark material correlated closely with the thermal stability boundary for coronene (C 24 H 12 ), which for frequencies <1 MHz has been shown to have a maximum dielectric permittivity of ò r ∼ 6.5 (Akin et al 2021).…”

Section: Constraints On Ice Puritymentioning

confidence: 90%

“…Alternatively, the inferred high dielectric values may be due to water ice with planetary-relevant polymers or maybe water-ammonia ices (Thompson & Squyres 1990;Lorenz 1998). Indeed, Hamill et al (2020) suggest that the thin mantling over some ice deposits may be coronene, which at frequencies <1 MHz has a dielectric permittivity of ò r ∼ 6.5 (Akin et al 2021). Experimental studies of the dielectric properties of planetary-relevant ices, ice mixtures, and polymers at the S band are needed to better assess the likelihood of these models.…”

Section: What Is the High Reflectance Deposit Observed Inmentioning

confidence: 99%

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Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits

et al. 2022

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Ground-based planetary radar observations first revealed deposits of potentially nearly pure water ice in some permanently shadowed regions (PSRs) on Mercury’s poles. Later, the MESSENGER spacecraft confirmed the icy nature of the deposits, as well as their location within PSRs. Considering the geologic context provided by MESSENGER, we further characterized the north polar deposits by pairing spacecraft data with new Arecibo S-band radar observations. Here we show that some ice deposits within PSRs have a gradational pattern in their radar properties that is likely associated with differences in ice purity. Radar-bright features with a circular polarization ratio μ c > 1 can be characterized by water ice with ≳3% impurities by volume while those with μ c < 1 by ≳20% impurities. Furthermore, areas in PSRs with μ c < 1 typically surround locations of stronger radar backscatter with μ c > 1. Therefore, deposits of nearly pure water ice are likely surrounded by lower-purity material, such as water-ice-rich regolith, which could be the result of impact gardening or the crater’s thermal environment. However, such deposits are not always colocated within large polar craters where ice should be the most stable, even at the surface. In fact, we found that there is no significant difference between the radar backscattering properties of deposits thought to have surficial ice and those with buried ice. Our results also help improve the identification of icy reservoirs elsewhere, such as the Moon. Indeed, we found that μ c is not an adequate diagnostic, but rather the radar backscatter in each circular polarization independently provides information to identify water-ice deposits.

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Section: Constraints On Ice Puritymentioning

confidence: 90%

Section: What Is the High Reflectance Deposit Observed Inmentioning

confidence: 99%

Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits

et al. 2022

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“…Coronene's high intrinsic carrier motions make them a candidate for use in organic electronics. Recently, considerable studies have been performed on the optical absorption properties and electronically excited states of coronene [10][11][12]. Coronene is also a good choice for making organic semiconductor devices such as photodiodes and blue light-emitting diodes [11,12].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Al-Muntaser,

Alzahrani,

Abo-Dief

et al. 2023

Phys. Scr.

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Composite films made of polyvinyl alcohol (PVA) filled with various coronene concentrations were fabricated via the solution casting method. Several characterization techniques were used to examine the prepared samples. The X-ray diffraction study shows decreasing semi-crystalline properties in PVA/coronene composites with increasing coronene levels, thereby improving charge carrier mobility and enhancing conductivity. The alterations in the chemical functional groups of the PVA/coronene composites were explored using Fourier-transform infrared spectroscopy (FTIR). The impact of coronene molecules on the optical characteristics of PVA was investigated in the spectral ranges of 190-2500 nm. PVA/coronene composite exhibits higher UV blocking in the 190-400 nm wavelength range, suitable for UV notch filters like laser blocking filters. By increasing the coronene filling ratio from 0 wt% to 3 wt%, both the indirect and direct optical band-gap of PVA films decreased from 5.15 eV and 5.75 eV to 3.83 eV and 5.12 eV, respectively. The single oscillator model (Wemple-DiDomenico) was used to explain the refractive index dispersion region. The extracted values of dispersion energy (Ed), oscillator energy (Eo), dielectric constant at infinite frequency (ε∞), and lattice dielectric constant (εL) of PVA/coronene composite samples increased from 0.78 eV, 2.41 eV, 1.32 and 1.41 to 13.44 eV, 12.22 eV 2.10 and 2.13, respectively. These changes in dispersion parameters are due to cross-linking between the PVA polymeric matrix and the coronene. As a result of these improvements, PVA/coronene films could be applied to flexible packaging applications and optoelectronic devices like solar cells or light-emitting diodes.

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“… 5 A layer of metal is coated on the fabric surface by magnetron sputtering, 6 electroless plating 7 and evaporation spin coating. 8 The commonly used metals include silver, nickel and copper. The second method: conductive polymers like polyaniline 9 or polythiophene 10 are compounded with the fabric through special processes such as coating and penetration to give the fabric conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of robust silver plated conductive polyamide fibres based on tannic acid modification

et al. 2022

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Dielectric Properties of Coronene Film Deposited onto Silicon Substrate by Spin Coating for Optoelectronic Applications

Cited by 10 publications

References 31 publications

Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits

Arecibo S-band Radar Characterization of Local-scale Heterogeneities within Mercury’s North Polar Deposits

Enhancement of the structural, optical, and dispersion performance of polyvinyl alcohol via coronene additive for optoelectronic applications

Fabrication of robust silver plated conductive polyamide fibres based on tannic acid modification

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