Plasmonic Modes in Molybdenum Ultra-thin Films Suitable for Hydrogenated Amorphous Silicon Thin Film Solar Cells

Lombardo, S.; Battaglia, A.; Foti, Marina; Tringali, Cristina; Cannella, G.; Costa, N.; Gerardi, C.; Principato, F.

doi:10.1016/j.egypro.2013.12.030

Cited by 7 publications

(3 citation statements)

References 11 publications

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“…Less common metals have been explored including palladium (Pd), magnesium (Mg), and yttrium hydride (YH 2 ) for their sensitivity to particular gases (for example, H 2 ) − and rhodium (Rh) due to its comparable optical properties to Al, but with resistance to oxidation . In this group we also include aluminum (Al), which although is not strictly a noble metal, has comparably low-loss and operation range. , For high temperature applications, the refractory metals molybdenum (Mo), niobium (Nb), nickel (Ni), tungsten (W), and titanium (Ti) are being exploited in plasmonics for their high melting temperature and red-shifted resonances compared to the noble metals. However, due to the fixed carrier concentration in monatomic metals, tuning of the plasmon resonance requires change of the geometry for these materials.…”

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confidence: 99%

“…17 In this group we also include aluminum (Al), which although is not strictly a noble metal, has comparably low-loss and operation range. 18,19 For high temperature applications, the refractory metals molybdenum (Mo), 20 niobium (Nb), 21 nickel (Ni), 22 tungsten (W), 23 and titanium (Ti) 24 are being exploited in plasmonics for their high melting temperature and red-shifted resonances compared to the noble metals. However, due to the fixed carrier concentration in monatomic metals, tuning of the plasmon resonance requires change of the geometry for these materials.…”

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confidence: 99%

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Quantifying Figures of Merit for Localized Surface Plasmon Resonance Applications: A Materials Survey

et al. 2019

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Using localized surface plasmon resonances (LSPR) to focus electromagnetic radiation to the nanoscale shows the promise of unprecedented capabilities in optoelectronic devices, medical treatments and nanoscale chemistry, due to a strong enhancement of light-matter interactions. As we continue to explore novel applications, we require a systematic quantitative method to compare suitability across different geometries and a growing library of materials. In this work, we propose application-specific figures of merit constructed from fundamental electronic and optical properties of each material. We compare 17 materials from four material classes (noble metals, refractory metals, transition metal nitrides, and conductive oxides) considering eight topical LSPR applications. Our figures of merit go beyond purely electromagnetic effects and account for the materials’ thermal properties, interactions with adjacent materials, and realistic illumination conditions. For each application we compare, for simplicity, an optimized spherical antenna geometry and benchmark our proposed choice against the state-of-the-art from the literature. Our propositions suggest the most suitable plasmonic materials for key technology applications and can act as a starting point for those working directly on the design, fabrication, and testing of such devices.

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Quantifying Figures of Merit for Localized Surface Plasmon Resonance Applications: A Materials Survey

et al. 2019

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“…[19][20][21][22] But those metals are not robust enough in harsh preparation processes such as high temperature and PECVD growth of a-Si:H. This may introduce impurity into a-Si:H layers and lead to higher carrier recombination in the photovoltaic or solar thermal devices. 23,24 Briefly, the primary issue of amorphous silicon applied in PETE or photovoltaic is enhancing the light absorption efficiency of amorphous silicon thin film and reducing the possibilities of unwanted impurity, and therefore microstructures of refractory metal may overcome these problems.…”

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confidence: 99%

Periodic molybdenum disc array for light trapping in amorphous silicon layer

et al. 2016

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We demonstrate the light trapping effect in amorphous silicon (a-Si:H) layer by inserting a layer of periodic molybdenum disc array (MDA) between the a-Si:H layer and the quartz substrate, which forms a three-layer structure of Si/MDA/SiO2. The MDA layer was fabricated by a new cost-effective method based on nano-imprint technology. Further light absorption enhancement was realized through altering the topography of MDA by annealing it at 700°C. The mechanism of light absorption enhancement in a-Si:H interfaced with MDA was analyzed, and the electric field distribution and light absorption curve of the different layers in the Si/MDA structure under light illumination of different wavelengths were simulated by employing numerical finite difference time domain (FDTD) solutions.

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Temperature-dependent dielectric functions of bcc transition metals Cr, Mo, and W from ultraviolet to infrared regions: A theoretical and experimental study

Yang

2018

Journal of Applied Physics

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In the bcc transition metals Cr, Mo, and W, the existence of the partially filled d bands makes interband transition occur at low photon frequencies and thus, it is difficult to differentiate it from intraband transition. Here, we present a thorough study on decomposing the intraband and interband contribution to finite temperature dielectric functions of these bcc transition metals by performing electron-phonon and electron-electron interaction calculations, as well as ellipsometry experiments. In this work, the Drude model and interband transition theory are applied to quantitatively describe the intraband and interband transition, respectively. To accurately determine intraband transition, the relevant parameters for the Drude model, such as plasma frequency and electron relaxation time, are calculated from first-principles. The electron-electron interaction within the many-body theory and electron-phonon interaction within the density functional perturbation theory are calculated to obtain the electron relaxation time and intraband dielectric function at finite temperature. As for interband transition, the spin-orbit coupling is included and it shows nontrivial influence on the interband dielectric function of Mo and W, especially at low frequencies. To verify theoretical calculations, ellipsometry experiments are performed to measure dielectric functions of Cr, Mo, and W over the temperature range of 300–700 K and energy range of 0.08–4.8 eV. The experimental results are then fitted by the Drude model, and it shows that the electron-phonon interaction rather than electron-electron interaction dominates the frequency dependence of the relaxation time for transition metals Cr, Mo, and W.

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Plasmonic Modes in Molybdenum Ultra-thin Films Suitable for Hydrogenated Amorphous Silicon Thin Film Solar Cells

Cited by 7 publications

References 11 publications

Quantifying Figures of Merit for Localized Surface Plasmon Resonance Applications: A Materials Survey

Quantifying Figures of Merit for Localized Surface Plasmon Resonance Applications: A Materials Survey

Periodic molybdenum disc array for light trapping in amorphous silicon layer

Temperature-dependent dielectric functions of bcc transition metals Cr, Mo, and W from ultraviolet to infrared regions: A theoretical and experimental study

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