The optical and electrical properties and resistance switching of granular films of silver on sapphire

Gladskikh, I. A.; Леонов, Н. Б.; Przhibel’skiĭ, S. G.; Vartanyan, T. A.

doi:10.1364/jot.81.000280

Cited by 16 publications

(8 citation statements)

References 4 publications

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“…Hence, at the threshold voltage the electrostatic attraction of opposite edges becomes strong enough to deform them slightly, to narrow the gap and to enhance the tunneling current through the gap. Note that the silver film can become conductive and remain in such state, as it was observed in the experiments performed on dielectric substrates 24,30 .…”

Section: Resultsmentioning

confidence: 58%

“…After annealing, the reflection spectra narrowed as compared to the non-annealed samples. This narrowing is due to the modification of the silver nanostructure morphology by surface diffusion of silver atoms on which the optical properties of metallic island films depend strongly [21][22][23][24] . Thermal annealing leads to dramatic changes in the morphology of nanostructures.…”

Section: Resultsmentioning

confidence: 99%

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Fabrication and characterization of the noble metal nanostructures on the GaAs surface

Gladskikh

Toropov

et al. 2016

SPIE Proceedings

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Self-assembled silver, gold, and copper nanostructures on the monocrystalline GaAs (100) wafer surface were obtained via physical vapor deposition and characterized by optical reflection spectroscopy, scanning electron microscopy, and current-voltage curve measurements. Reflection spectra of the samples with Ag equivalent thicknesses of 2, 5, 7.5, and 10 nm demonstrated wide plasmonic bands in the visible range of spectra. Thermal annealing of the nanostructures led to narrowing of the plasmonic bands of Au and Ag nanostructures caused by major transformations of the film morphology. While the as prepared films predominantly had a small scale labyrinth structure, after annealing well-separated nanoislands are formed on the gallium arsenide surface. A clear correlation between films morphology and their optical and electrical properties is elucidated. Annealing of the GaAs substrate with Ag nanostructures at 100 °C under control of the resistivity allowed us to obtain and fix the structure at the percolation threshold. It is established that the samples at the percolation threshold possess the properties of resistance switching and hysteresis.

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Section: Resultsmentioning

confidence: 58%

Section: Resultsmentioning

confidence: 99%

Fabrication and characterization of the noble metal nanostructures on the GaAs surface

Gladskikh

Toropov

et al. 2016

SPIE Proceedings

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show abstract

“…After annealing, the reflection spectra narrowed as compared to non-annealed samples. This narrowing is due to the modification of the silver nanostructure morphology by surface diffusion of silver atoms on which the optical properties of metallic island films depends strongly (Kelly et al 2003;Toropov et al 2012Toropov et al , 2014Gladskikh et al 2014). …”

Section: Resultsmentioning

confidence: 99%

Correlation between structural, optical, and electrical properties of self-assembled plasmonic nanostructures on the GaAs surface

Gladskikh

Toropov

et al. 2015

J Nanopart Res

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Self-assembled silver nanostructures on the industry-grade monocrystalline GaAs (100) wafer surface were obtained via physical vapor deposition and characterized by optical reflection spectroscopy, scanning electron microscopy, and current-voltage curve measurements. Reflection spectra of the samples with Ag equivalent thicknesses of 5, 7.5, and 10 nm demonstrated wide plasmonic bands in the visible range of spectra. Thermal annealing of the nanostructures led to narrowing of the plasmonic bands caused by major transformations of the film morphology. While the As prepared films predominantly had a small-scale labyrinth structure, after annealing wellseparated silver nanoislands are formed on the gallium arsenide surface. A clear correlation between films morphology and their optical and electrical properties is elucidated. Annealing of the GaAs substrate with Ag nanostructures at 100°C under control of the resistivity allowed us to obtain and fix the structure at the percolation threshold. It is established that the samples at the percolation threshold possess the properties of resistance switching and hysteresis.

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“…Of all possible percolation materials, here we consider those exhibiting plasticity, i. e capable of changing their resistances in response to electric bias. They include metal oxides and chalcogenide compounds used respectively with resistive random access memory (RRAM) 11 and phase change memory (PCM), 4 granular metals, 12 and nano-composites. 13 Such percolation with plasticity (PWP) systems are illustrated in Fig.…”

Section: Introductionmentioning

confidence: 99%

Percolation with plasticity for neuromorphic systems

2020

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We develop a theory of percolation with plasticity media (PWPs) rendering properties of interest for neuromorphic computing. Unlike the standard percolation, they have multiple (N ≫ 1) interfaces and exponentially large number (N!) of conductive pathways between them. These pathways consist of non-ohmic random resistors that can undergo bias induced nonvolatile modifications (plasticity). The neuromorphic properties of PWPs include: multi-valued memory, high dimensionality and nonlinearity capable of transforming input data into spatiotemporal patterns, tunably fading memory ensuring outputs that depend more on recent inputs, and no need for massive interconnects. A few conceptual examples of functionality here are random number generation, matrix-vector multiplication, and associative memory. Understanding PWP topology, statistics, and operations opens a field of its own calling upon further theoretical and experimental insights.

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The optical and electrical properties and resistance switching of granular films of silver on sapphire

Cited by 16 publications

References 4 publications

Fabrication and characterization of the noble metal nanostructures on the GaAs surface

Fabrication and characterization of the noble metal nanostructures on the GaAs surface

Correlation between structural, optical, and electrical properties of self-assembled plasmonic nanostructures on the GaAs surface

Percolation with plasticity for neuromorphic systems

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