Three-dimensional grating nanowires for enhanced light trapping

Lee, Hoo Cheol; Na, Jin Young; Moon, Yoon Jong; Park, Jin-Sung; Ee, Ho Seok; Park, Hong Gyu; Kim, Sun Kyung

doi:10.1364/ol.41.001578

Cited by 12 publications

(6 citation statements)

References 27 publications

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“…Although such in situ and ex situ efforts have led to successful modulation of the optical resonances in a NW, attaining large absorption efficiency at the deep-red to near-infrared wavelengths remains a nontrivial issue, particularly for crystalline Si NW PV devices. − , Recently, periodic-shell NWs have been synthesized with their diameter modulated along the axis, with a well-defined pitch. , Numerical simulations have showed that periodic-shell Si NWs yield significantly enhanced absorption efficiency at specific long wavelengths because they can convert the normally incident plane waves into axially propagating waveguide modes, thereby enhancing the absorption. , This suggests that increasing the morphological complexity of NWs could enable amplification of the optical resonances at specific wavelengths. Analogous to this in situ synthetic control, fabricating complex nanoscale structures and transferring them onto a NW can give rise to similar optical effects, providing a viable strategy for the development of high-efficiency NW PV devices.…”

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confidence: 99%

Enhancement of Light Absorption in Silicon Nanowire Photovoltaic Devices with Dielectric and Metallic Grating Structures

Park

Kim

Hwang³

et al. 2017

Nano Lett.

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We report the enhancement of light absorption in Si nanowire photovoltaic devices with one-dimensional dielectric or metallic gratings that are fabricated by a damage-free, precisely aligning, polymer-assisted transfer method. Incorporation of a SiN grating with a Si nanowire effectively enhances the photocurrents for transverse-electric polarized light. The wavelength at which a maximum photocurrent is generated is readily tuned by adjusting the grating pitch. Moreover, the electrical properties of the nanowire devices are preserved before and after transferring the SiN gratings onto Si nanowires, ensuring that the quality of pristine nanowires is not degraded during the transfer. Furthermore, we demonstrate Si nanowire photovoltaic devices with Ag gratings using the same transfer method. Measurements on the fabricated devices reveal approximately 27.1% enhancement in light absorption compared to that of the same devices without the Ag gratings without any degradation of electrical properties. We believe that our polymer-assisted transfer method is not limited to the fabrication of grating-incorporated nanowire photovoltaic devices but can also be generically applied for the implementation of complex nanoscale structures toward the development of multifunctional optoelectronic devices.

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confidence: 99%

Enhancement of Light Absorption in Silicon Nanowire Photovoltaic Devices with Dielectric and Metallic Grating Structures

Park

Kim

Hwang³

et al. 2017

Nano Lett.

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“…The resulting phase pattern ( Figure 5a ) arranges periodically in the entire pupil plane to shift the single MS to the appointed positions along both the transverse and axial directions. This behaves as a distinct and versatile phase-only 3D grating 42 , 43 . Figure 5b represents the 3D iso-magnetization surface of the induced magnetization distribution at M = M max /2 when the optimized phase pattern ( Figure 5a ) is imposed on the incoming beams at the pupil plane.…”

Section: Resultsmentioning

confidence: 99%

Three-dimensional super-resolution longitudinal magnetization spot arrays

et al. 2017

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We demonstrate an all-optical strategy for realizing spherical three-dimensional (3D) super-resolution (∼λ3/22) spot arrays of pure longitudinal magnetization by exploiting a 4π optical microscopic setup with two high numerical aperture (NA) objective lenses, which focus and interfere two modulated vectorial beams. Multiple phase filters (MPFs) are designed via an analytical approach derived from the vectorial Debye diffraction theory to modulate the two circularly polarized beams. The system is tailored to constructively interfere the longitudinal magnetization components, while simultaneously destructively interfering the azimuthal ones. As a result, the magnetization field is not only purely longitudinal but also super-resolved in all three dimensions. Furthermore, the MPFs can be designed analytically to control the number and locations of the super-resolved magnetization spots to produce both uniform and nonuniform arrays in a 3D volume. Thus, an all-optical control of all the properties of light-induced magnetization spot arrays has been demonstrated for the first time. These results open up broad applications in magnetic-optical devices such as confocal and multifocal magnetic resonance microscopy, 3D ultrahigh-density magneto-optic memory, and light-induced magneto-lithography.

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“…Moreover, tests in a different direction have been conducted to manipulate wire array configurations such as square, triangular, Penrose, and random structures [20]. Besides, ample studies focus on designing the gratingstructured NWs made from various materials with certain optical properties [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Ultra-thin broadband solar absorber based on stadium-shaped silicon nanowire arrays

Mortazavifar

Salehi

Shahraki

et al. 2022

Front. Optoelectron.

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This paper investigates how the dimensions and arrangements of stadium silicon nanowires (NWs) affect their absorption properties. Compared to other NWs, the structure proposed here has a simple geometry, while its absorption rate is comparable to that of very complex structures. It is shown that changing the cross-section of NW from circular (or rectangular) to a stadium shape leads to change in the position and the number of absorption modes of the NW. In a special case, these modes result in the maximum absorption inside NWs. Another method used in this paper to attain broadband absorption is utilization of multiple NWs which have different geometries. However, the maximum enhancement is achieved using non-close packed NW. These structures can support more cavity modes, while NW scattering leads to broadening of the absorption spectra. All the structures are optimized using particle swarm optimizations. Using these optimized structures, it is viable to enhance the absorption by solar cells without introducing more absorbent materials. Graphical Abstract

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Three-dimensional grating nanowires for enhanced light trapping

Cited by 12 publications

References 27 publications

Enhancement of Light Absorption in Silicon Nanowire Photovoltaic Devices with Dielectric and Metallic Grating Structures

Enhancement of Light Absorption in Silicon Nanowire Photovoltaic Devices with Dielectric and Metallic Grating Structures

Three-dimensional super-resolution longitudinal magnetization spot arrays

Ultra-thin broadband solar absorber based on stadium-shaped silicon nanowire arrays

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