Temperature-dependent terahertz conductivity of tin oxide nanowire films

Zou, Xingquan; Luo, Jingshan; Lee, Dong‐Wook; Cheng, Chuanwei; Springer, Daniel; Nair, Saritha K.; Cheong, Siew Ann; Fan, Hong Jin; Chia, Elbert E. M.

doi:10.1088/0022-3727/45/46/465101

Cited by 40 publications

(57 citation statements)

References 42 publications

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“…23,29,[34][35][36]39,71,73,76 Alternatively, the Drude-Smith model has also been used as an EMT in its own right and fit directly to the measured THz conductivity. [9][10][11][12][13][14][15][16][17][18][19]21,22,[25][26][27]30,31,33,38,[41][42][43][44][45]48 Each approach begins with a different physical process and leads to its own difficulties when one interprets the subsequent fits to the data.…”

Section: −48mentioning

confidence: 99%

Microscopic origin of the Drude-Smith model

et al. 2017

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The Drude-Smith model has been used extensively in fitting the THz conductivities of nanomaterials with carrier confinement on the mesoscopic scale. Here, we show that the conventional 'backscattering' explanation for the suppression of low-frequency conductivities in the Drude-Smith model is not consistent with a confined Drude gas of classical non-interacting electrons and we derive a modified Drude-Smith conductivity formula based on a diffusive restoring current. We perform Monte Carlo simulations of a model system and show that the modified Drude-Smith model reproduces the extracted conductivities without free parameters. This alternate route to the DrudeSmith model provides the popular formula with a more solid physical foundation and well-defined fit parameters.

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Section: −48mentioning

confidence: 99%

Microscopic origin of the Drude-Smith model

et al. 2017

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“…[110] In even smaller (nanometersized) nanocrystals, the first excitonic transition appears far above the THz range. [114] Regardless of the nanoparticle shape, size and spatial distribution and orientation, many works still employ the Drude-Smith model as a base for fitting the THz conductivity spectra of a variety of nanostructures, including silicon nanowires, [115] nanocrystals [116][117][118] and polycrystalline films, [119] SnO 2 nanowires, [120][121][122] nanowhiskers [123] and mesoporous films, [124] CdSe nanobelts, [125] CdS x Se 1−x nanobelts [126,127] and nanowires, [128] ZnSe nanocrystals, [129] Au nanostructures, [130] granular kesterite films, [131] organic perovskite CsPbBr 3 nanocrystals, [132] VO 2 nanogranular films, [133,134] or graphene nanoribbons. [111,112] The excitonic polarizability can be calculated on a microscopic level, e.g., using a multiband effectivemass model.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

“…[112,113] A transition from an extended electron state into a localized exciton state was observed in CdSe nanorods. [114] Regardless of the nanoparticle shape, size and spatial distribution and orientation, many works still employ the Drude-Smith model as a base for fitting the THz conductivity spectra of a variety of nanostructures, including silicon nanowires, [115] nanocrystals [116][117][118] and polycrystalline films, [119] SnO 2 nanowires, [120][121][122] nanowhiskers [123] and mesoporous films, [124] CdSe nanobelts, [125] CdS x Se 1−x nanobelts [126,127] and nanowires, [128] ZnSe nanocrystals, [129] Au nanostructures, [130] granular kesterite films, [131] organic perovskite CsPbBr 3 nanocrystals, [132] VO 2 nanogranular films, [133,134] or graphene nanoribbons. [135] Some of these analyses further combine the Drude-Smith model with an effective medium approximation; this approach was used for example in order to describe the response of silicon nanowires and nanocrystals, [136] ZnO nanowires, [137] ZnO/In 2 S 3 core/shell nanorod heterojunctions, [138] or silver nanowires.…”

Section: Wwwadvopticalmatdementioning

confidence: 99%

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Kužel

Němec

2019

Advanced Optical Materials

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Transport of charges is a fundamental process in many high-tech applications including photovoltaic or optoelectronic devices, but also in more ordinary components such as unsophisticated wires and other circuitry. The development of nanotechnologies resulted in the fabrication of highly complex materials consisting of a large variety of nanosized elements, which inevitably involve a multitude of charge transport processes occurring on various time-and length-scales. Figure 1 summarizes the most common nanoelements with high application potential.For example, the electrodes employed in Grätzel solar cells [1] are composed of percolated networks of a huge number of metal oxide nanoparticles (top-left panel in Figure 1). Colloidal nanocrystals form the basis for thin film electronics and flexible electronic devices. [2] The synthetic approaches control their composition, size and electronic structure (energy levels, density of states within the bands and in the bandgap) and the charge-carrier transport. [2,3] Nanowires and nanotubes made of conventional semiconductors are quasi 1D systems combining Terahertz spectroscopy has been used for almost two decades for investigations of nanomaterials, including nanocrystals, nanoparticles, nanowires, nanotubes or 2D crystals. Its great importance stems from the fact that it is a noncontact method and, owing to its high frequency and broadband character, it is capable of characterizing charge transport properties within individual nano-objects but also among them. In addition, probing of photoinitiated ultrafast charge dynamics is possible thanks to the sub-picosecond time resolution. Despite this unprecedented potential, the interpretation of the measured terahertz conductivity spectra in many materials is still intensively debated. Herein is presented a review of the experiments performed on nanostructures of conventional semiconductors and on carbon nanomaterials (graphene and carbon nanotubes) during the past decade. The state of the art of the theoretical formalism is provided and discussed, including the intrinsic response, as well as the role of inherent heterogeneity and of the experimental conditions.

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“…Adequate fits are achieved for all samples, with particularly good results obtained for the doped samples. From these fits, the charge carrier density N , carrier mobility µ and dc conductivity σ dc can be described using a simple effective medium theory as

N = \frac{ϵ_{0} ω_{normalp}^{2} m^{*}}{e^{2}}

μ = \frac{true(1 + c_{1} true) e}{ω_{normalτ} m^{*}}

σ_{dc} = (1 + c_{1}) \frac{ϵ_{0} ω_{normalp}^{2}}{ω_{normalτ}}

where ϵ 0 is the vacuum permittivity and m * is the effective mass of the charge carrier.…”

Section: Thz Measurements and Drude–smith Modelingmentioning

confidence: 99%

“…Adequate fits are achieved for all samples, with particularly good results obtained for the doped samples. From these fits, the charge carrier density N, carrier mobility m and dc conductivity σ dc can be described using a simple effective medium theory as [25] N ¼…”

Section: Thz Measurements and Drude-smith Modelingmentioning

confidence: 99%

Dielectric Properties of DMSO‐Doped‐PEDOT:PSS at THz Frequencies

Xuan

et al. 2017

Physica Status Solidi (b)

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Poly(3,4‐ethylenedioxythiophene):poly(4‐styrenesulfonate) (PEDOT:PSS) is a promising candidate for terahertz (THz) metamaterial devices. Its dielectric properties can be changed by the dopant dimethylsulfoxide (DMSO). In this study, the dielectric properties of DMSO‐doped‐PEDOT:PSS films are investigated using terahertz time‐domain spectroscopy (THz‐TDS) measurements. The values of the carrier density and mobility are also determined by fitting the dielectric permittivity to the Drude–Smith model. A simple THz frequency selective surface (FSS) is designed based on these DMSO‐doped‐PEDOT:SS films. Strong band rejection can be achieved at resonant frequencies. These results may inspire the development of new materials for manipulating THz waves in future studies.

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Temperature-dependent terahertz conductivity of tin oxide nanowire films

Cited by 40 publications

References 42 publications

Microscopic origin of the Drude-Smith model

Microscopic origin of the Drude-Smith model

Terahertz Spectroscopy of Nanomaterials: a Close Look at Charge‐Carrier Transport

Dielectric Properties of DMSO‐Doped‐PEDOT:PSS at THz Frequencies

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