Effect on optical properties and electrical performances of antireflective coating with gradient refractive index based on p-type amorphous SiOx thin films

Huang, Lu; Jin, Qi; Qu, Xingling; Jin, Jing; Yang, Weiguang; Wang, Linjun; Shi, Weimin

doi:10.1016/j.surfcoat.2017.01.110

Cited by 3 publications

(2 citation statements)

References 22 publications

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“…Although single-layer antireflection coatings are easy to prepare, their antireflection wavelengths are limited to narrow bands. , To extend antireflection bands, a good option is to create graded-index coatings. Graded-index coatings are coatings with a graded refractive index gradually decreasing from their bottom to their top. ,− Graded-index coatings can be prepared by stacking several layers of coatings with progressively different refractive indices, with the high-index coating on the bottom and the low-index coating on the top. Two-layer coatings with different refractive indices were prepared, consisting of a bottom layer with a refractive index of 1.18 and a thickness of 105 nm and a top layer with a refractive index of 1.07 and thickness of 114 nm.…”

Section: Resultsmentioning

confidence: 99%

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Chi

Zeng

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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Optical coatings with controllable ultralow refractive indices are of profound significance in optical areas. However, it remains a challenge to fabricate such coatings using a simple method. Here we develop an effective and simple approach to create ultra-low-index coatings. This approach was based on a modified sol–gel process, with a key process that involved the aggregation of silica nanoparticles via the addition of a polymer surfactant (e.g., polyvinylpyrrolydone) in sols before coating. The approach involves three steps: the synthesis of silica sols under ammonia catalysis in ethanol (Stöber method), the addition of polyvinylpyrrolydone in the silica sols to induce the aggregation of the silica nanoparticles, and the formation of ultra-low-index coatings by depositing the aggregated silica sols on substrates. Through varying the aggregation extent, this approach produced coatings with controllable refractive indices ranging from 1.17 to 1.07. To the best of our knowledge, the minimum index value of 1.07 from our coating is among the lowest refractive indices ever reported. The ultra-low-index coatings demonstrated excellent optical properties, with which perfect quarter-wavelength antireflection coatings (maximum transmittance ∼100%) and broadband antireflection coatings (transmittance >98% from 400 to 1100 nm) can be prepared. One advantage of the antireflection coatings is that their transmission is less dependent on the refractive index and the thickness of the stacking layer, which make it promising in large-scale production. Moreover, the coatings can be made hydrophobic (water contact angle 136°) by exposing the coatings to a hexamethyldisilazane atmosphere, exhibiting high environmental stability in a humid environment. The aggregation of silica nanoparticles in sol–gel processes provides a scalable alternative to the current approaches for creating ultra-low-index coatings.

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Section: Resultsmentioning

confidence: 99%

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Chi

Zeng

Liu

et al. 2020

ACS Appl. Mater. Interfaces

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“…This tendency could further be enhanced as the content of silica NPs is increased in the films. This trend could be explained in terms of the increase in the value of the optical band gap and the fact that silica NPs are strongly antireflective [21,22,23]. Therefore, nanocomposite thin films based on PVC-PS-silica hybrid could be used as anti-reflectance coating.…”

Section: Optical Characterization Of Nanocomposites Thin Filmsmentioning

confidence: 99%

A novel optical model of the experimental transmission spectra of nanocomposite PVC-PS hybrid thin films doped with silica nanoparticles

Al‐Bataineh

Alsaad

Ahmad

et al. 2020

Heliyon

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We propose a novel derived optical model fitted to the experimental transmittance of PVC-PS hybrid thin films doped with Silica nanoparticles. The films are synthesized using a simple dip-coating method. The model has successfully interpreted the experimental spectral behaviour of transmittance of amorphous semiconductors and dielectric thin films. Interestingly, our model reproduces the optical parameters of the investigated thin films in good agreement with those predicted by Tauc plot. The great advantage of the proposed model over other models lies in its ability to explain the correlations between the film thickness and the optical bandgap. Furthermore, we investigate the structural, physical, and optical properties of PVC-PS-SiO 2 thin films, in relevance to the silica percentage content. XRD measurements show that the as-prepared polymeric thin films are amorphous. In addition, SEM micrographs indicate that silica nanoparticles are well dispersed on the surface of the PVC-PS thin films with an average diameter of 100-400 nm. The effect of annealing parameters is also investigated to optimize the projected water contact angle of PVC-PS-SiO 2 thin films. At annealing temperature of 2000 C, films become hydrophobic. The transmittance T% of the PVC-PS thin films is found to be about 83% in the visible region. The T % enhances to 90% upon adding silica NPs into PVC-PS polymeric thin films. Obtaining coatings with high transmittance is of crucial importance for several optoelectronic and photonic applications.

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Design and preparation of high-transmittance broadband antireflection coatings with tailored refractive indices deposited by PECVD

Hang

Liu

Zhang³

et al. 2023

Vacuum

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Effect on optical properties and electrical performances of antireflective coating with gradient refractive index based on p-type amorphous SiOx thin films

Cited by 3 publications

References 22 publications

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

Aggregation of Silica Nanoparticles in Sol–Gel Processes to Create Optical Coatings with Controllable Ultralow Refractive Indices

A novel optical model of the experimental transmission spectra of nanocomposite PVC-PS hybrid thin films doped with silica nanoparticles

Design and preparation of high-transmittance broadband antireflection coatings with tailored refractive indices deposited by PECVD

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