Optical properties of antireflective flat or rough patterned topped silicon cones gratings

Rouzo, Judikaël Le; Brückner, Jean-Baptiste; Ferchichi, A.K.; Gourgon, C.; Berginc, Gérard; Escoubas, Ludovic

doi:10.1179/2055031614y.0000000005

Cited by 10 publications

(4 citation statements)

References 29 publications

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“…This ensures the usage of more photogenerated power, yielding an increase in the cell efficiency. In addition, the possibility of reducing the parasitic absorption also reduces for the textured substrate . It can also be added that a Cu 2 O film deposited on the text ‐Si substrate shows low resistivity which also plays an important role in the same.…”

Section: Resultsmentioning

confidence: 99%

“…In spite of this, the surface reflection is not suppressed below 5% for the full solar spectrum . Due to the stringent need of meeting the goal of much higher antireflecting properties of heterojunctions, an additional solution can be the use of textured surfaces or mimicking the well‐known “moth‐eye” effect, which not only provides an alternative approach to improve antireflection (AR) property using multiple reflections but also offers an additional trapping/absorption of solar spectrum by diffuse scattering and/or mode coupling . In fact, recent reports show that various textured surfaces can be used as highly improved AR coatings with a proper index matching at the substrate .…”

Section: Introductionmentioning

confidence: 99%

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Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications

et al. 2018

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In this paper, we show the efficacy of a conformally grown, self‐organized Cu2O overlayer on chemically synthesized, pyramidally textured silicon substrate for a colossal suppression of optical reflection loss. In particular, we demonstrate that p‐Cu2O film deposited on a chemically textured n‐Si substrate shows an ultra‐low average surface reflectance (≈0.25%) over the entire spectral range (300–2400 nm), whereas the same turns out to be ≈25% for the film deposited on an as‐obtained n‐type Si substrate. It is observed that in the former case, Cu2O grows in the form of leaf‐like nanostructures, which is attributed to be responsible for such a low reflectance. In addition, under both configurations, the p‐Cu2O/n‐Si heterostructure shows a non‐linear current–voltage characteristics, clearly suggesting the formation of barrier junctions. Further, it is found that a solar cell fabricated with p‐Cu2O overlayer grown on a pyramidally textured n‐Si substrate shows an eight times higher efficiency compared to the one grown on an as‐obtained n‐Si substrate. This study will pave the way to design cost‐effective and efficient copper oxide‐based solar cells.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications

et al. 2018

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“…Several approaches or new structures can be used in optoelectronic devices in order to improve their performances. Different routes are possible: the first is to minimize reflection at the air-material interface with anti-reflective coatings such as thin film layers or structured surfaces (see figure 2, [3]). The second is based on the engineering of the electromagnetic field to control its distribution in the thickness of a stack of thin films [4].…”

Section: Photonic Structures Nanoparticles and Light Managementmentioning

confidence: 99%

Specific tools for studying the optical response of heterogeneous thin film layers

et al. 2017

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The extraordinary progresses in the design and realization of structures in inorganic or organic thin films, whether or not including nanoparticles, make it possible to develop devices with very specific properties. Mastering the links between the macroscopic optical properties and the opto-geometrical parameters of these heterogeneous layers is thus a crucial issue. We propose to present the tools used to characterize and to model thin film layers, from an optical point of view, highlighting the interest of coupling both experimental and simulation studies for improving our knowledge on the optical response of the structure. Different examples of studies are presented on CIGS, Perovskite,P3HT:ZnO, PC70BM, organic layer containing metallic nanoparticles and colored solar cells.

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“…Among those geometric effects are nanowires or nanocones leading to broad antireflective bands at different regimes following the dimensions of the structures. Additionally, the reflectivity can be strongly affected by light scattering and trapping along rough surfaces. − Random texturing of the surface has also been used to affect the reflectance. However, it is not always straightforward to design controlled textured surfaces with optimum optical properties; hence, the use of direct geometrical structuring and capping films/coatings of other materials have been widely used instead.…”

Section: Introductionmentioning

confidence: 96%

Strong Reduction in Ge Film Reflectivity by an Overlayer of 3 nm Si Nanoparticles: Implications for Photovoltaics

Rezk

Hadi

Ashraf

et al. 2021

ACS Appl. Nano Mater.

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We examine the effect of a top nanofilm of 3 nm silicon nanoparticles (Si-NPs) on the spectral features of the reflectivity of germanium (Ge). We use a 450 nm Ge layer grown by low temperature plasma enhanced chemical vapor deposition on a crystalline Si substrate. The Si-NPs are drop casted incrementally on the Ge/Si structure from a particle colloid, forming a nanofilm of increasing thickness up to 30 nm. The stack is characterized using luminescence microscopy, atomic force microscopy, transmission electron microscopy, and reflectivity spectroscopy. The reflectance of the stack is measured over UV/ visible and infrared range 4.8−0.8 eV. With the increasing thickness of the Si nanocoating, the results show a strong reduction in the reflectivity of Ge in the visible and blue-UV region of the spectrum with less effect in the infrared, as well as a difference in reflectance at the adjacent lying complex of Λ and L transitions of Ge. The strong reduction in the visible/UV range is understood in terms of a near overlap of the band to band transitions of Si-NPs and Ge. The diminished response in the infrared contributes to shifting of the bandgap of Si-NPs from the infrared to the visible due to quantum confinement. Furthermore, optical properties of Si-NP are estimated and samples are analyzed using Modified Transfer Matrix Method model. The strong reduction of reflectivity of Ge in the visible-UV region is very useful in photovoltaics, with special emphasis on Ge-based multijunction solar cells.

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Optical properties of antireflective flat or rough patterned topped silicon cones gratings

Cited by 10 publications

References 29 publications

Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications

Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications

Specific tools for studying the optical response of heterogeneous thin film layers

Strong Reduction in Ge Film Reflectivity by an Overlayer of 3 nm Si Nanoparticles: Implications for Photovoltaics

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Optical properties of antireflective flat or rough patterned topped silicon cones gratings

Cited by 10 publications

References 29 publications

Colossal Broad Band Antireflection from Conformally Grown Cu2O on Pyramidally Textured Si and its Photovoltaic Applications

Colossal Broad Band Antireflection from Conformally Grown Cu2O on Pyramidally Textured Si and its Photovoltaic Applications

Specific tools for studying the optical response of heterogeneous thin film layers

Strong Reduction in Ge Film Reflectivity by an Overlayer of 3 nm Si Nanoparticles: Implications for Photovoltaics

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Product

Resources

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Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications

Colossal Broad Band Antireflection from Conformally Grown Cu₂O on Pyramidally Textured Si and its Photovoltaic Applications