High performance single layer nano-porous antireflection coatings on glass by sol–gel process for solar energy applications

Mahadik, D. B.; Lakshmi, R.V.; Barshilia, Harish C.

doi:10.1016/j.solmat.2015.03.023

Cited by 103 publications

(50 citation statements)

References 23 publications

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“…The sol-gel method offers several advantages when compared to traditional synthesis processes [1,36,[125][126][127]; namely, the ease of fabrication and flexibility of the process, the large number of precursor reagents commercially available with tuned functional groups and the low environmental impact. Furthermore, sol-gel also allows for excellent control of the stoichiometry of the precursor; and the incorporation of different components that introduce complementary functions to the material (Figure 2), such as UV protection [128][129][130], anti-fouling [131,132], anti-reflection [133,134], moisture resistance [135], corrosion protection [15,16,31,38,[136][137][138] and detection of biological components [88,139]-proteins [140] and enzymes [92,141], antibodies [142,143], DNA [95,144,145], polysaccharides [146,147], etc. This feature allows one to obtain, in a simple way, smart and multifunctional materials.…”

Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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The corrosion process is a major source of metallic material degradation, particularly in aggressive environments, such as marine ones. Corrosion progression affects the service life of a given metallic structure, which may end in structural failure, leakage, product loss and environmental pollution linked to large financial costs. According to NACE, the annual cost of corrosion worldwide was estimated, in 2016, to be around 3%-4% of the world's gross domestic product. Therefore, the use of methodologies for corrosion mitigation are extremely important. The approaches used can be passive or active. A passive approach is preventive and may be achieved by emplacing a barrier layer, such as a coating that hinders the contact of the metallic substrate with the aggressive environment. An active approach is generally employed when the corrosion is set in. That seeks to reduce the corrosion rate when the protective barrier is already damaged and the aggressive species (i.e., corrosive agents) are in contact with the metallic substrate. In this case, this is more a remediation methodology than a preventive action, such as the use of coatings. The sol-gel synthesis process, over the past few decades, gained remarkable importance in diverse areas of application. Sol-gel allows the combination of inorganic and organic materials in a single-phase and has led to the development of organic-inorganic hybrid (OIH) coatings for several applications, including for corrosion mitigation. This manuscript succinctly reviews the fundamentals of sol-gel concepts and the parameters that influence the processing techniques. The state-of-the-art of the OIH sol-gel coatings reported in the last few years for corrosion protection, are also assessed. Lastly, a brief perspective on the limitations, standing challenges and future perspectives of the field are critically discussed.Polymers 2020, 12, 689 The development of OIH sol-gel coatings, based on siloxanes, for corrosion mitigation, has been widely studied in the last few years [2,31,[36][37][38]. Numerous studies have been conducted since the early 1990s [39,40]. The studies performed showed that siloxanes were effective in mitigating the corrosion processes of different metallic substrates. This development was mainly due to the need for alternative environmentally friend materials and processes to replace the traditional chromium-based pre-treatments. Hexavalent chromium (Cr (VI)) is carcinogenic and shows high environmental toxicity and its use has been forbidden since 2006. However, Cr(VI) based pre-treatments improve the coating adherence to the substrate and are effective corrosion inhibitors [41][42][43] which make its replacement challenging. The use of the sol-gel method to produce OIH coatings for corrosion mitigation suits the main requirements of what should be an environmentally friendly process (i.e., excludes washing stages; it is a waste-free method) and allows one to obtain coatings with high purity and specific pore volumes and surface areas. Since it is a mild synthesis...

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Section: Sol-gel Process: a Historical Perspective And Applicationsmentioning

confidence: 99%

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Figueira

2020

Polymers

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“…It can be described by the ratio between the diffuse reflectance (R diffuse ) and total reflectance (R total ) 40,41 : Fig. 1 | Photographs of the (a, d) Larger Haze values correspond to increased scattering and hence an increased optical path length, which is of critical importance to improve light absorption 40,41 . Thus, considering this aspect, the LDS coatings presented here are good candidates to be used in PV cells.…”

Section: Optical Characterizationmentioning

confidence: 99%

Lanthanide-based downshifting layers tested in a solar car race

Correia

Bastos

et al. 2019

OEA

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The mismatch between the AM1.5G spectrum and the photovoltaic (PV) cells absorption is one of the most limiting factors for PV performance. To overcome this constraint through the enhancement of solar energy harvesting, luminescent downshifting (LDS) layers are very promising to shape the incident sunlight and, thus, we report here the use of Tb 3+and Eu 3+ -doped organic-inorganic hybrid materials as LDS layers on Si PV cells. Electrical measurements on the PV cell, done before and after the deposition of the LDS layers, confirm the positive effect of the coatings on the cell's performance in the UV spectral region. The maximum delivered power and the maximum absolute external quantum efficiency increased 14% and 27%, respectively. Moreover, a solar powered car race was organized in which the small vehicle containing the coated PV cells presented a relative increase of 9% in the velocity, when compared to that with the uncoated one.

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“…The reflectance losses due to the refractive index mismatch between a material and the air can be reduced by applying an ARC with an intermediate refractive index between air and the substrate material (Prevo et al, 2005). The antireflection coatings can either be materials with an intermediate refractive index between the substrate and air or porous or refractive index-graded materials (Mahadik et al, 2015). Most of these antireflection coatings (ARCs) are manufactured by film deposition techniques such as chemical vapor deposition (CVD), sputtering, or evaporation, as well as possible lithography steps.…”

Section: Introductionmentioning

confidence: 99%

Enhancing photovoltaic performance of perovskite solar cells with silica nanosphere antireflection coatings

et al. 2018

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Peer reviewed versionCyswllt i'r cyhoeddiad / Link to publication Dyfyniad o'r fersiwn a gyhoeddwyd / Citation for published version (APA): S. (2018). Enhancing photovoltaic performance of perovskite solar cells with silica nanosphere antireflection coatings. Solar Energy, 169, 128-135. A B S T R A C TOrganic-inorganic halide perovskite solar cells have enormous potential to impact the existing photovoltaic industry. As realizing higher power conversion efficiency (PCE) of the solar cell is still the most crucial task, a great number of schemes were proposed to minimize the carrier loss by optimizing the electrical properties of the perovskite solar cells (PSCs). Here, we focus on another significant aspect that is to minimize the light loss by using an antireflection coating (ARC) component to gain a high PCE for PSC devices. In our scheme, silica nanosphere based ARCs are employed to CH 3 NH 3 PbI 3 PSCs for enhancing the device efficiency. SiO 2 nanosphere based ARCs were grown by spin-coating of an aged silica sol. The microstructure and the thickness of the SiO 2 nanosphere based ARC were controlled by changing the spin-coating speed from 400 to 4000 rpm. The effect of SiO 2 nanosphere based ARCs on the photovoltaic performance of perovskite solar cells is systematically investigated. The optimized SiO 2 nanosphere ARC coating on cleaned glass substrate exhibited a maximum transmittance of 96.1% at λ = 550 nm wavelength, and averagely increased the transmittance by about 3.8% in a broadband of 400-800 nm. The optimized antireflection coating strongly suppressed broadband and wideangle reflectance in typical PSC solar cells, significantly enhancing the omnidirectional photovoltaic (PV) performance of PSCs. As a result, the power conversion efficiency was improved from 14.81% for reference device without SiO 2 nanospheres to 15.82% for the PSC device with the optimized ARC. Also, the PV performance of the PSC device with the optimized SiO 2 nanosphere ARC revealed less angular dependence for incident light.

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High performance single layer nano-porous antireflection coatings on glass by sol–gel process for solar energy applications

Cited by 103 publications

References 23 publications

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Hybrid Sol–gel Coatings for Corrosion Mitigation: A Critical Review

Lanthanide-based downshifting layers tested in a solar car race

Enhancing photovoltaic performance of perovskite solar cells with silica nanosphere antireflection coatings

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