Light Trapping in Single Coaxial Nanowires for Photovoltaic Applications

Liu, Wenfu; Oh, Jeong Il; Shen, Wei

doi:10.1109/led.2010.2086428

Cited by 43 publications

(55 citation statements)

References 12 publications

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“…[12][13][14]17,[20][21][22][23][24][25][26][27] For example, absorption or scattering cross sections have been estimated qualitatively, 17,[20][21][22][23] while in other works wavelength-dependent photocurrent measurements performed on single NW PV devices were used to assign quantitatively the resonances of NW optical cavities. [13][14][15] Concurrent with experiments, numerical and analytical calculations of the resonant modes and key optical figures of merit (e.g.…”

mentioning

confidence: 99%

“…absorption efficiency and scattering cross section) for NW optical cavities have been reported. 13,14,20,21,[24][25][26][27] However, systematic studies of design rules for enhancing and tuning light absorption at broad-range wavelengths in NWs and their assembled structures have not been reported. In this study, we address these issues in Si NWs with modulated material compositions and cross-sectional geometries using numerical simulations, and moreover, elucidate the optical properties of single-and multi-layer arrays assembled the NW building blocks.…”

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confidence: 99%

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Design of Nanowire Optical Cavities as Efficient Photon Absorbers

et al. 2014

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Recent investigations of semiconductor nanowires have provided strong evidence for enhanced light absorption, which has been attributed to nanowire structures functioning as optical cavities. Precise synthetic control of nanowire parameters including chemical composition and morphology has also led to dramatic modulation of absorption properties. Here we report finite-difference time-domain (FDTD) simulations for silicon (Si) nanowire cavities to elucidate the key factors that determine enhanced light absorption. The FDTD simulations revealed that a crystalline Si nanowire with an embedded 20-nm-thick amorphous Si shell yields

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confidence: 99%

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Design of Nanowire Optical Cavities as Efficient Photon Absorbers

et al. 2014

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“…Several strategies-including engineering light absorption in the nanowire [11,12], morphological design [13,14], and multiabsorber patterns [15][16][17]-are well known for enhancing absorption capability of individual nanowires. Alternative approaches to enhance the absorption efficiency, such as light trapping techniques using low-index or metallic nanostructures, also have been widely investigated for their accumulation performance [18,19]. It is worth noting, however, that constructing large-scale and efficient optoelectronic devices should rely on selection of their appropriate nano-building blocks.…”

Section: Introductionmentioning

confidence: 99%

Nanosprings harvest light more efficiently

Khudiyev

Bayındır

2015

Appl. Opt.

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Nanotechnology presents versatile architectural designs for the purpose of utilization as a building block of 1D optoelectronic nanodevices because current nanowire-based schemes require more effective solutions for low absorption capacity of nanoscale volumes. We report on the potential of nanospring absorbers as an alternative light-harvesting platform with significant advantages over conventional nanowires. Absorption capacity of nanospring geometry is found to be superior to cylindrical nanowire shape. Unlike nanowires, they are able to trap a larger amount of light thanks to characteristic periodic behavior that boosts light collection for the points matched with Mie resonances. Moreover, nanospring shape supplies compactness to a resulting device with area preservation as high as twofold. By considering that a nanospring array with optimal periods yields higher absorption than individual arrangements and core-shell designs, which further promote light collection due to unique antireflection features of shell layer, these nanostructures will pave the way for the development of highly efficient self-powered nanosystems.

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“…In addition to that SiNWs have higher absorption capability, nearly 70 %, which is much greater than that of bulk silicon [12,13]. SiNWs show higher absorption since when the SiNW arrays are placed in orthogonal direction to light absorption and charge separation by fabricating radial p-n junctions, it enables efficient carrier collection and light trapping in optically thick nanowire arrays, even when minority carrier diffusion lengths are shorter than the optical absorption length [14][15][16]. SiNWs arrays also show comparatively low reflection losses than planner semiconductor [14] which definitely leads to higher absorption also.…”

Section: Introductionmentioning

confidence: 99%

Broadband optical absorption measurement of silicon nanowires for photovoltaic solar cell applications

2014

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The broadband optical absorption properties of silicon nanowire films fabricated by electroless metal deposition technique followed by HF/Fe(NO 3 ) 3 solutionbased chemical etching at room temperature on p-type silicon substrates have been measured and found absorption higher than that of the solid thin films of equivalent thickness. The observed behavior is effectively explained by light scattering and light trapping though some of the observed absorption is due to a high density of surface states in the nanowires films. Synthesized structures absorbed more than 82 % of incident radiation in case of Cu-deposited silicon nanowires, whereas for Ag it was maximum 83 %, which is much greater than that of the bulk silicon as they absorbed maximum 43 % of the radiation.

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Light Trapping in Single Coaxial Nanowires for Photovoltaic Applications

Cited by 43 publications

References 12 publications

Design of Nanowire Optical Cavities as Efficient Photon Absorbers

Design of Nanowire Optical Cavities as Efficient Photon Absorbers

Nanosprings harvest light more efficiently

Broadband optical absorption measurement of silicon nanowires for photovoltaic solar cell applications

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