Super-hydrophilic broadband anti-reflective coating with high weather stability for solar and optical applications

Joshi, Dhavalkumar N.; Atchuta, S.R.; Reddy, Y. Lokeswara; Arkoti, Naveen Kumar; Sakthivel, S.

doi:10.1016/j.solmat.2019.110023

Cited by 49 publications

(14 citation statements)

References 34 publications

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“…In order to overcome this issue, novel photon harvesting strategies enabling optimization of light coupling to the semiconductor material over a broadband spectral range are required. Different approaches have been so far proposed such as the growth of antireflective thin-film coatings [16][17][18] at the semiconductor surface or combination with plasmonic nanoarrays [19][20][21][22][23]. However, these multilayer coatings require a tailored combination of dissimilar materials, encounter adhesion issues due to thermal expansion mismatch, and display a good performance only over a limited wavelength band and a narrow angular range determined by the thickness and refractive index of the material employed.…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional and broadband photon harvesting in self-organized Ge columnar nanovoids

Chowdhury¹,

Mondal²,

Secchi³

et al. 2022

Nanotechnology

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Highly porous Germanium surfaces with uniformly distributed columnar nanovoid structures are fabricated over a large area (wafer scale) by large fluence Sn+ irradiation through a thin silicon nitride layer. The latter represents a one-step highly reproducible approach with no material loss to strongly increase photon harvesting into a semiconductor active layer by exploiting the moth-eye anti-reflection effect. The ion implantation through the nitride cap layer allows fabricating porous nanostructures with a high aspect ratio, which can be tailored by varying ion fluence. By comparing the reflectivity of nanoporous Ge films with a flat reference we demonstrate a strong and omnidirectional reduction in the optical reflectivity by a factor 96% in selected spectral regions around 960nm and by a factor 67.1% averaged over the broad spectral range from 350nm to 1800 nm. Such highly anti-reflective nanostructured Ge films prepared over large areas with a self-organized maskless approach have the potential to impact real-world applications aiming at energy harvesting.

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Section: Introductionmentioning

confidence: 99%

Omnidirectional and broadband photon harvesting in self-organized Ge columnar nanovoids

Chowdhury¹,

Mondal²,

Secchi³

et al. 2022

Nanotechnology

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“…The surface-cleaning agents could selectively remove organic contaminations without harming the antifog effect due to the enhanced durability of the silica composite nanocoating. We found that the bioinspired approach herein has several advantages for further scientific and industrial applications: (1) the nanocoating process is simple and fast; (2) fabrication of the nanocoating utilizes a fully water-based process that does not require toxic chemicals; and (3) the nanocoating has the potential to combine functional organic and inorganic materials to form multicomposite nanocoatings, which could be useful in future optoelectronic applications that require high durability, such as weather-resistant solar panels …”

Section: Discussionmentioning

confidence: 99%

Chemically Robust Antifog Nanocoating through Multilayer Deposition of Silica Composite Nanofilms

Kim

Park

2020

ACS Appl. Mater. Interfaces

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A coating must remain intact to perform its inherent functions on a surface, and often functional organic coatings fail due to deterioration because of their intrinsic vulnerabilities. In this work, we present a biomimetic material based on a glass sponge to provide a robust silica composite nanocoating with an antifog effect. The silica composite nanocoating was constructed with a binary film structure consisting of (1) a Fe(III)−tannic acid (TA) nanofilm for adhesion to coat the substrates and (2) a SiO 2 layer to enhance the durability of the coating. Due to the universal coating property of Fe(III)−TA nanofilms, we demonstrated that the silica composite nanocoating was effective regardless of the substrate. By layer-by-layer assembly of the silica composite, it is possible to precisely control the nanocoating thickness. The superhydrophilic nature of the SiO 2 layer showed an exceptional antifog effect that remained intact against multiple deteriorative conditions, including acid treatment, peroxide degradation, sudden temperature change, severe heat conduction, and oil contamination. In addition, the silica composite nanocoating is scalable for surfaces of different shapes and sizes with the aid of a spray-assisted deposition technique. The bioinspired, multicomposite nanocoating strategy herein contributes to the improvement of organic coatings for uses in applications to tackle current technological problems.

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“…7 The performance of a solar cell integrated with a cover glass depends on the amount of radiation within a particular range of the solar spectrum that passes through the cover glass and reaches the photovoltaic semiconductor. 8,9 A part of the incoming radiation incident on the surface of the cover glass is reflected before reaching the active solar layers. Reflection is usually a detrimental phenomenon that takes place at the interface between the substrate and transmitted media because of the quick change in refractive index from air to the substrate and causes a loss in the efficiency of the solar cell.…”

Section: Introductionmentioning

confidence: 99%

“…The cover glass has several desirable features, including optical transparency and visual appearance 7 . The performance of a solar cell integrated with a cover glass depends on the amount of radiation within a particular range of the solar spectrum that passes through the cover glass and reaches the photovoltaic semiconductor 8,9 . A part of the incoming radiation incident on the surface of the cover glass is reflected before reaching the active solar layers.…”

Section: Introductionmentioning

confidence: 99%

Photon management by scratch‐resistant antireflection coating for the efficiency enhancement of silicon solar cell

Swathi

Shanthi

Aishwarya³

et al. 2022

Intl J of Energy Research

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Antireflection coating (ARC) plays a crucial role in many solar and optical applications. ARC with mechanical robustness was developed to achieve more efficiency for the photovoltaic system cover glasses, by depositing porous Vinyltriethoxysilane/Pluronic F-127-based coating via spin coating technique.The coating shows maximum transparency around 93% in the visible region (400-800 nm). The mechanical robustness of the coating was analyzed using a pencil scratch test as per the ASTM standard D 3363-05 and it showed good stability against a 9H hardness pencil. The porous coating exhibited an enhanced conversion efficiency of 10.56% as compared to the bare glass of efficiency 9.71%; which validate the light-trapping ability of the coating in the visible region. Also, the coating sustains the efficiency of the solar cell even during dust exposure due to its good self-cleaning ability with water contact angle of 112 . It is also noteworthy that the prepared ARC shows UV stability under the UV-B lamp for 72 hours. The ARC developed in this study opens a promising approach to harvest renewable solar energy for photovoltaic systems.

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Super-hydrophilic broadband anti-reflective coating with high weather stability for solar and optical applications

Cited by 49 publications

References 34 publications

Omnidirectional and broadband photon harvesting in self-organized Ge columnar nanovoids

Omnidirectional and broadband photon harvesting in self-organized Ge columnar nanovoids

Chemically Robust Antifog Nanocoating through Multilayer Deposition of Silica Composite Nanofilms

Photon management by scratch‐resistant antireflection coating for the efficiency enhancement of silicon solar cell

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