Fabrication of Silicon Nanobelts and Nanopillars by Soft Lithography for Hydrophobic and Hydrophilic Photonic Surfaces

Baquedano, Estela; Martínez, Ramsés V.; Llorens, Jorge Cardona; Postigo, P. A.

doi:10.3390/nano7050109

Cited by 18 publications

(11 citation statements)

References 36 publications

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“…After forming the relief pattern in the resist, the underlying substrate can then be etched using standard processes ( Al-Abaddi et al, 2012 ). By offering a variety of resist materials with a range of fabrication conditions, NIL can be used to pattern nano-architectures on a variety of substrate materials, including silicon and polymers ( Eom et al, 2015 ; Baquedano et al, 2017 ). Resolutions less than 100 nm and even approaching 2 nm have been achieved using NIL ( Dong et al, 2005b ; Li et al, 2011 ).…”

Section: Technologies To Create Nano-architecturementioning

confidence: 99%

Nano-Architectural Approaches for Improved Intracortical Interface Technologies

et al. 2018

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Intracortical microelectrodes (IME) are neural devices that initially were designed to function as neuroscience tools to enable researchers to understand the nervous system. Over the years, technology that aids interfacing with the nervous system has allowed the ability to treat patients with a wide range of neurological injuries and diseases. Despite the substantial success that has been demonstrated using IME in neural interface applications, these implants eventually fail due to loss of quality recording signals. Recent strategies to improve interfacing with the nervous system have been inspired by methods that mimic the native tissue. This review focusses on one strategy in particular, nano-architecture, a term we introduce that encompasses the approach of roughening the surface of the implant. Various nano-architecture approaches have been hypothesized to improve the biocompatibility of IMEs, enhance the recording quality, and increase the longevity of the implant. This review will begin by introducing IME technology and discuss the challenges facing the clinical deployment of IME technology. The biological inspiration of nano-architecture approaches will be explained as well as leading fabrication methods used to create nano-architecture and their limitations. A review of the effects of nano-architecture surfaces on neural cells will be examined, depicting the various cellular responses to these modified surfaces in both in vitro and pre-clinical models. The proposed mechanism elucidating the ability of nano-architectures to influence cellular phenotype will be considered. Finally, the frontiers of next generation nano-architecture IMEs will be identified, with perspective given on the future impact of this interfacing approach.

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Section: Technologies To Create Nano-architecturementioning

confidence: 99%

Nano-Architectural Approaches for Improved Intracortical Interface Technologies

et al. 2018

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“…In these calls, one of the key topics has been ‘Solar glasses and encapsulation materials’. The LIMES project addressed several aspects that are relevant for PV cover glasses and investigated optical, 63 mechanical and chemical properties of glass as well as novel thermal toughening methods 97 and also the addition of antireflective and self‐cleaning capabilities to the glass surface 98,99 . The glasses made in laboratory experiments were used for proof‐of‐concept studies by making the 70 × 70 mm PV modules discussed here.…”

Section: Introductionmentioning

confidence: 99%

Towards improved cover glasses for photovoltaic devices

Allsopp

Orman

Johnson

et al. 2020

Progress in Photovoltaics

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For the solar energy industry to increase its competitiveness, there is a global drive to lower the cost of solar-generated electricity. Photovoltaic (PV) module assembly is material-demanding, and the cover glass constitutes a significant proportion of the cost. Currently, 3-mm-thick glass is the predominant cover material for PV modules, accounting for 10%-25% of the total cost. Here, we review the state-of-the-art of cover glasses for PV modules and present our recent results for improvement of the glass. These improvements were demonstrated in terms of mechanical, chemical and optical properties by optimizing the glass composition, including addition of novel dopants, to produce cover glasses that can provide (i) enhanced UV protection of polymeric PV module components, potentially increasing module service lifetimes; (ii) re-emission of a proportion of the absorbed UV photon energy as visible photons capable of being absorbed by the solar cells, thereby increasing PV module efficiencies and (iii) successful laboratory-scale demonstration of proof of concept, with increases of 1%-6% in I sc and 1%-8% in I pm. Improvements in both chemical and crack resistance of the cover glass were also achieved through modest chemical reformulation, highlighting what may be achievable within existing manufacturing technology constraints. K E Y W O R D S chemical properties, cover glass, mechanical properties, optical properties, photoluminescence, PV modules, strengthening of glass 1 | INTRODUCTION Solar energy is often seen as the ultimate renewable energy because of the abundance of solar irradiation available for solar energy generation. In only 90 min, the Earth receives enough energy from the sun to provide its entire annual energy requirements. 1 Chapin, Fuller and Pearson invented the first practical photovoltaic (PV) cell in 1954, 2 and since the year 2000, installed PV capacity has experienced an almost exponential growth. 3 The installed PV capacity can be regulated politically but that is largely achieved on a national level and may be subject to change within just a few years. The growth of the solar energy market has been driven by the reduction of costs. For solar or any other renewable energy source, it has been a necessity to compete on an economical level (i.e., reaching so-called grid parity), and

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“…The resist was then covered with the PDMS stamp with the desired pattern and was then pressed between two glasses to obtain a mask. The resist was cured under low-vacuum (desiccator) for 3 h [ 34 ]. All the procedures were extremely easy and cheap and permitted the fabrication of large areas, in our case limited to a size around 1.8 × 1.8 cm 2 for easier handling during experimental measurements.…”

Section: Experimental Processmentioning

confidence: 99%

Increased Efficiency of Solar Cells Protected by Hydrophobic and Hydrophilic Anti-Reflecting Nanostructured Glasses

et al. 2017

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We investigated the fabrication of large-area (cm2) nanostructured glasses for solar cell modules with hydrophobic and hydrophilic properties using soft lithography and colloidal lithography. Both of these techniques entail low-cost and ease of nanofabrication. We explored the use of simple 1D and 2D nanopatterns (nanowires and nanocones) and the effect of introducing disorder in the nanostructures. We observed an increase in the transmitted light for ordered nanostructures with a maximum value of 99% for wavelengths >600 nm when ordered nanocones are fabricated on the two sides of the solar glass. They produced an increment in the efficiency of the packaged solar cell with respect to the glass without nanostructures. On the one hand, the wettability properties showed that the ordering of the nanostructures improved the hydrophobicity of the solar glasses and increased their self-cleaning capacity. On the other hand, the disordered nanostructures improved the hydrophilic properties of solar glasses, increasing their anti-fogging capacity. The results show that by selecting the appropriate nanopattern, the wettability properties (hydrophobic or hydrophilic) can be easily improved without decreasing the efficiency of the solar cell underneath.

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Fabrication of Silicon Nanobelts and Nanopillars by Soft Lithography for Hydrophobic and Hydrophilic Photonic Surfaces

Cited by 18 publications

References 36 publications

Nano-Architectural Approaches for Improved Intracortical Interface Technologies

Nano-Architectural Approaches for Improved Intracortical Interface Technologies

Towards improved cover glasses for photovoltaic devices

Increased Efficiency of Solar Cells Protected by Hydrophobic and Hydrophilic Anti-Reflecting Nanostructured Glasses

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