Al2O3/TiO2 nano-pattern antireflection coating with ultralow surface recombination

Spinelli, Pierpaolo; Macco, Bart; Verschuuren, MA; Kessels, Wmm Erwin; Polman, A.

doi:10.1063/1.4810970

Cited by 76 publications

(71 citation statements)

References 13 publications

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“…The total reflectance in our disordered samples is strongly reduced over a broad band and a broad angle, in agreement with ordered Mie resonators arrays 15,16,18,21 . We observe that, for ordered arrays of Si-based dielectric particles obtained with top-down methods the best reported value of R tot is about 2% for above band-gap frequencies, whereas in the same spectral interval our best device reaches a value of less than 5%.…”

Section: Discussionsupporting

confidence: 83%

“…The working principle of our samples is similar to of textured surfaces 9,10 with the additional feature of resonances mediating the light coupling. In view of applications of our AR on thin-film photovoltaic cells or light detectors, the merit of our method is to avoid a direct texturing of the Si wafer thus potentially preserving a high carrier mobility and lifetime 16 .…”

Section: Discussionmentioning

confidence: 99%

“…In contrast with previous reports which focused only on above band-gap frequencies 15,16,18,19,21 , we extended this idea to below band-gap frequencies in the near-infrared (∼1050-2500 nm) where R tot can be as low as 7%. Moreover we showed the possibility of tuning the minimum of R tot both for below-and above band-gap frequencies by adjusting the thickness of additional conformal layers deposited atop the SiGe islands.…”

Section: Discussionmentioning

confidence: 99%

“…Efficient anti-reflection coatings (AR) have been intensively studied with many different approaches having been explored for this purpose [1][2][3] , such as multi-layered thinfilms 4,5 , graded index matching via surface texturing with micro-and nano-structures [6][7][8][9][10][11] , plasmonic metasurfaces [12][13][14] and more recently, metasurfaces [15][16][17][18][19][20][21] based on ordered arrays of sub-micrometric dielectric antennas (dielectric Mie resonators [22][23][24][25][26][27][28] ). Depending on the application of the AR different aspects (lowest value of the total reflectance, broad spectral range, broad acceptance angle, transparency or light trapping) determine the optimal features and fabrication method.…”

Section: Introductionmentioning

confidence: 99%

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Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Bouabdellaoui

Checcucci

Wood

et al. 2018

Phys. Rev. Materials

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We demonstrate a simple self-assembly method based on solid state dewetting of ultra-thin silicon films and germanium deposition for the fabrication of efficient anti reflection coatings on silicon for light trapping. Via solid state dewetting of ultra-thin silicon on insulator and epitaxial deposition of Ge we fabricate SiGe islands with a high surface density, randomly positioned and broadly varied in size. This allows to reduce the reflectance to low values in a broad spectral range (from 500 nm to 2500 nm) and a broad angle (up to 55 degrees) and to trap within the wafer a large portion of the impinging light (∼40%) also below the band-gap, where the Si substrate is non-absorbing. Theoretical simulations agree with the experimental results showing that the efficient light coupling into the substrate mediated by Mie resonances formed within the SiGe islands. This lithography-free method can be implemented on arbitrarily thick or thin SiO2 layers and its duration only depends on the sample thickness and on the annealing temperature.

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Section: Discussionsupporting

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Bouabdellaoui

Checcucci

Wood

et al. 2018

Phys. Rev. Materials

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“…47,48 In the liquid phase the Ga behaves as a Drude metal ( Figure 1D) and continues to support plasmonic resonances throughout the near-infrared (NIR). When solid, Ga has a refractive index of n > 5 in the NIR and may support geometric resonances that are strongly damped by interband absorption.…”

Section: Articlementioning

confidence: 99%

Gallium Plasmonics: Deep Subwavelength Spectroscopic Imaging of Single and Interacting Gallium Nanoparticles

et al. 2015

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Gallium has recently been demonstrated as a phasechange plasmonic material offering UV tunability, facile synthesis, and a remarkable stability due to its thin, self-terminating native oxide. However, the dense irregular nanoparticle (NP) ensembles fabricated by molecular-beam epitaxy make optical measurements of individual particles challenging. Here we employ hyperspectral cathodoluminescence (CL) microscopy to characterize the response of single Ga NPs of various sizes within an irregular ensemble by spatially and spectrally resolving both in-plane and out-of-plane plasmonic modes. These modes, which include hybridized dipolar and higher-order terms due to phase retardation and substrate interactions, are correlated with finite difference time domain (FDTD) electrodynamics calculations that consider the Ga NP contact angle, substrate, and native Ga/Si surface oxidation. This study experimentally confirms previous theoretical predictions of plasmonic size-tunability in single Ga NPs and demonstrates that the plasmonic modes of interacting Ga nanoparticles can hybridize to produce strong hot spots in the ultraviolet. The controlled, robust UV plasmonic resonances of gallium nanoparticles are applicable to energy-and phase-specific applications such as optical memory, environmental remediation, and simultaneous fluorescence and surface-enhanced Raman spectroscopies.

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3D‐Printing for Solar Cells

Vece

Dijk²,

Schropp

2021

3D Printing for Energy Applications

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Al2O3/TiO2 nano-pattern antireflection coating with ultralow surface recombination

Cited by 76 publications

References 13 publications

Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Self-assembled antireflection coatings for light trapping based on SiGe random metasurfaces

Gallium Plasmonics: Deep Subwavelength Spectroscopic Imaging of Single and Interacting Gallium Nanoparticles

3D‐Printing for Solar Cells

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