Fabrication of high-transmittance and low-reflectance meter-scale moth-eye film via roll-to-roll printing

Ju, Sucheol; Choi, Jin Young; Chae, Dongwoo; Lim, Hong Chul; Ho-jung, Kang; Lee, Heon

doi:10.1088/1361-6528/aba7e4

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…Photon harvesting functionalities, such as anti-reflection, can alternatively be achieved via surface nanopatterning of the active material itself, at the sub-wavelength scale via moth-eye effect and/or broadband light scattering [24][25][26][27][28][29]. The reduction of reflectivity over a broad wavelength range can be achieved by properly tailoring the size and shape of the nanostructure arrays with consequent increase of the optical absorption in the high index semiconductor material [30][31][32][33][34].…”

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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“…An example of a biomimetic film with self-cleaning capabilities inspired by the latter can be found in the work of Ju et al [53], in which a 170 nm high moth-eye pattern was fabricated on a 1.1 m wide polyethylene terephthalate (PET) film via roll-to-roll printing, making it suitable for large-scale photovoltaic applications (Figure 6). The resulting film was highly transparent, with an average transmittance in the visible of over 90%, and exhibited a contact angle of 140.3 • ; despite this value being lower than the one conventionally used to describe super-hydrophobic materials, the film still showed self-cleaning properties.…”

Section: Super-hydrophobic Surface Structuring For Stabilitymentioning

confidence: 99%

Biomimetic Approaches to “Transparent” Photovoltaics: Current and Future Applications

2022

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There has been a surge in the interest for (semi)transparent photovoltaics (sTPVs) in recent years, since the more traditional, opaque, devices are not ideally suited for a variety of innovative applications spanning from smart and self-powered windows for buildings to those for vehicle integration. Additional requirements for these photovoltaic applications are a high conversion efficiency (despite the necessary compromise to achieve a degree of transparency) and an aesthetically pleasing design. One potential realm to explore in the attempt to meet such challenges is the biological world, where evolution has led to highly efficient and fascinating light-management structures. In this mini-review, we explore some of the biomimetic approaches that can be used to improve both transparent and semi-transparent photovoltaic cells, such as moth-eye inspired structures for improved performance and stability or tunable, coloured, and semi-transparent devices inspired by beetles’ cuticles. Lastly, we briefly discuss possible future developments for bio-inspired and potentially bio-compatible sTPVs.

show abstract

“…An example of a biomimetic film with self-cleaning capabilities inspired by the latter can be found in the work of Ju et al [43], in which a 170 nm high moth-eye pattern was fabricated on a 1.1 m wide PET film via roll-to-roll printing, making it suitable for largescale photovoltaic applications (Figure 6). The resulting film was highly transparent, with an average transmittance in the visible of over 90 % and exhibited a contact angle of 140.3°; despite this value being lower than the one conventionally used to describe super-hydrophobic materials, the film still showed self-cleaning properties.…”

Section: Super-hydrophobic Surface Structuring For Stabilitymentioning

confidence: 99%

Biomimetic Approaches to “Transparent” Photovoltaics: Current and Future Applications

Pompilio¹,

Ierides²,

Cacialli³

2022

Preprint

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There has been a surge in the interest for (semi)transparent photovoltaics (sTPVs) in recent years, since the more traditional, opaque, devices are not ideally suited for a variety of innovative appli-cations spanning from smart and self-powered windows for buildings to those for vehicle inte-gration. Additional requirements for these photovoltaic applications are a high conversion effi-ciency (despite the necessary compromise to achieve a degree of transparency) and an aesthetical-ly pleasing design. One potential realm to explore in the attempt to meet such challenges is the bio-logical world, where evolution has led to highly efficient and fascinating light-management structures. In this mini-review, we explore some of the biomimetic approaches that can be used to improve both transparent and semitransparent photovoltaic cells, such as moth-eye inspired structures for improved performance and stability or tuneable, coloured, and semi-transparent devices inspired by beetles’ cuticles. Lastly, we will briefly discuss possible future developments for bio-inspired and potentially bio-compatible sTPVs.

show abstract

Fabrication of high-transmittance and low-reflectance meter-scale moth-eye film via roll-to-roll printing

Cited by 10 publications

References 37 publications

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

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

Biomimetic Approaches to “Transparent” Photovoltaics: Current and Future Applications

Biomimetic Approaches to “Transparent” Photovoltaics: Current and Future Applications

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