Superenhancers: Novel opportunities for nanowire optoelectronics

Khudiyev, Tural; Bayındır, Mehmet

doi:10.1038/srep07505

Cited by 14 publications

(9 citation statements)

References 41 publications

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Section: Model and Methodsmentioning

confidence: 99%

“…The wavelength-dependent complex refractive index of Si fitted with the experimental data [44] and that of the inner shell, the outer shell and the surrounding medium (air) are set to be 2.5, 1.5 and 1.0, respectively. Note here that for simplicity, we have neglected the wavelength dependence of the refractive indices to neatly determine the impact of their size on the absorption spectra [30,31,45], as discussed later; however, as long as the wavelength dependence is negligible, our results could apply to any other dielectric with similar refractive index, such as SiO 2 , Si 3 N 4 and so forth. The insets are the cross-sectional views of the NW only coated with the outer shell (OSNW) (left), DSNW (middle) and the NW only coated with the outer shell (ISNW) (right), where J ph is the photocurrent density; t 1 , t 2 , t = t 1 + t 2 = 180 nm, r = 100 nm and R = r + t = 280 nm are the outer shell thickness, the inner shell thickness, the total shell thickness, the core radius and the total radius; m 3 , m 2 , m 1 and m 0 are the complex refractive indices of the Si core, the inner shell, the outer shell and air, respectively.…”

Section: Modelmentioning

confidence: 99%

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Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

et al. 2020

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Single nanowires (NWs) are of great importance for optoelectronic applications, especially solar cells serving as powering nanoscale devices. However, weak off-resonant absorption can limit its light-harvesting capability. Here, we propose a single NW coated with the graded-index dual shells (DSNW). We demonstrate that, with appropriate thickness and refractive index of the inner shell, the DSNW exhibits significantly enhanced light trapping compared with the bare NW (BNW) and the NW only coated with the outer shell (OSNW) and the inner shell (ISNW), which can be attributed to the optimal off-resonant absorption mode profiles due to the improved coupling between the reemitted light of the transition modes of the leak mode resonances of the Si core and the nanofocusing light from the dual shells with the graded refractive index. We found that the light absorption can be engineered via tuning the thickness and the refractive index of the inner shell, the photocurrent density is significantly enhanced by 134% (56%, 12%) in comparison with that of the BNW (OSNW, ISNW). This work advances our understanding of how to improve off-resonant absorption by applying graded dual-shell design and provides a new choice for designing high-efficiency single NW photovoltaic devices.

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Section: Model and Methodsmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

et al. 2020

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show abstract

“…The wavelength-dependent complex refractive index of Si fitted with the experimental data [44], and that of the inner shell, the outer shell, and the surrounding medium (air) are set to be 2.5, 1.5, and 1.0, respectively. Note here that for simplicity, we have neglected the wavelength dependence of the refractive indices to neatly determine the impact of their size on the absorption spectra [30,31,45], as shown in Figure 5 later; however, as long as the wavelength dependence is negligible, our results could apply to any other dielectric with similar refractive index, such as SiO2, Si3N4, etc.…”

Section: Modelmentioning

confidence: 99%

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

Liu

Guo

Xing

et al. 2020

Preprint

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Single nanowires (NWs) are of great importance for optoelectronic applications, especially solar cells serving as powering nanoscale devices. However, weak off-resonant absorption can limit its light-harvesting capability. Here, we propose a single NW coated with the graded-index dual shells (DSNW). We demonstrate that with appropriate thickness and refractive index of the inner shell, the DSNW exhibits significantly enhanced light trapping compared with the bare NW (BNW), and the NW only coated with the outer shell (OSNW) and the inner shell (ISNW), which can be attributed to the optimal off-resonant absorption mode profiles due to the improved coupling between the reemitted light of the transition modes of the leak mode resonances of the Si core and the nanofocusing light from the dual shells with the graded refractive index. We found that the light absorption can be engineered via tuning the thickness and the refractive index of the inner shell, the photocurrent density is significantly enhanced by 134% (56%, 12%) in comparison with that of the BNW (OSNW, ISNW). This work advances our understanding of how to improve off-resonant absorption by applying graded dual-shell design and provides a new choice for designing high-efficiency single NW photovoltaic devices.

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“…We take average AE as a figure of merit and maximize it throughout the process of parameter sweeping. 18 AE is defined as…”

Section: B Influence Of the Substrate And Geometrical Configurationsmentioning

confidence: 99%

Exploring the effective photon management by InP nanoparticles: Broadband light absorption enhancement of InP/In0.53Ga0.47As/InP thin-film photodetectors

Liu

Zhu

et al. 2015

Journal of Applied Physics

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High-index dielectric and semiconductor nanoparticles with the characteristics of low absorption loss and strong scattering have attracted more and more attention for improving performance of thin-film photovoltaic devices. In this paper, we focus our attention on InP nanoparticles and study the influence of the substrate and the geometrical configurations on their scattering properties. We demonstrate that, compared with the InP sphere, the InP cylinder has higher coupling efficiency due to the stronger interactions between the optical mode in the nanoparticle and its induced mirror image in the substrate. Moreover, we propose novel thin-film InGaAs photodetectors integrated with the periodically arranged InP nanoparticles on the substrate. Broadband light absorption enhancement is achieved over the wavelength range between 1.0 μm and 1.7 μm. The highest average absorption enhancement of 59.7% is realized for the photodetector with the optimized cylinder InP nanoparticles. These outstanding characteristics attribute to the preferentially forward scattering of single InP nanoparticle along with the effective coupling of incident light into the guided modes through the collective diffraction effect of InP nanoparticles array.

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Superenhancers: Novel opportunities for nanowire optoelectronics

Cited by 14 publications

References 41 publications

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

Exploring the effective photon management by InP nanoparticles: Broadband light absorption enhancement of InP/In0.53Ga0.47As/InP thin-film photodetectors

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