Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Variable range hopping"”.
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Transport Characteristics of Amorphous Semiconductors in the Dilute Carrier Regime: A Variable Range Hopping Treatment
… atoms in an initially pristine rhombohedral arrangement of icosahedra. We find the transport characteristics to be most sensitive to the size of the icosahedral clusters relative to their mean separation, while it is robust with respect to disorder. In particular, the transport characteristics …
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Ion Implantation and Characterization of High Temperature and High Performance Polymers
… ten different ions from ⁴He to ¹³⁷Xe with a wide range of energies of 50 keV to 42 MeV have been implanted with a dose range of 10¹³ to 10¹⁷ ions/cm². Surface electrical conductivities of these originally insulating polymers have been drastically enhanced after the ion implantation. Structural and …
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Ladungstransport indimensionsreduzierten Festkörpern
… aus Kohlenstoff und Gallium-Arsenid kann mit variable-range-hopping beschrieben werden.
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Influence of ag-doped on magnetic and electrical transport properties in Pr0.75Na0.25MnO3 manganites
… for y = 0 0.10 was found to fit well with the variable range hopping model (VRH) with the increasing of hopping and activation energy as the Ag concentration increased. While for the metallic region which is below the TMI, the resistivity data of y = 0.05 was fitted well with the combination of …
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Structural, electro-magnetic and electrical analysis in monovalent doped Nd0.75Na0.25-xKxMnO3 manganites
… Apart from that, the electrical analysis; variable range hopping (VRH) model was selected in order to explain the electrical behavior of the samples as the value of R2 is approached to 0.9999 as it has highest value compared to small polaron hoping (SPH) model. In conclusion, the effect of …
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Low Temperature Electrical Transport in 2D Layers of Graphene, Graphitic Carbon Nitride, Graphene Oxide and Boron-Nitrogen-Carbon
… film has displayed metallic behavior over a wide range of temperature (5 K < T <300 K). At higher temperatures, resistivity followed linearly with the temperature (ρ(T) ~T). A power law dependence (ρ(T) ~ T4) observed at lower temperatures. Where as liquid phase exfoliated graphene and graphitic …
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Electrically Conductive Low Dimensional Nanostructures: Synthesis, Characterisation and Application
… in bulk.The conductivity can be described using variable-range hopping model.
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Charge transport mechanism within 2D material films and its role on field effect transistor and capacitor technology
… dependent measurements revealed that 3D variable range hopping (3D VRH) is the main electron transport mechanism in graphene. While MoS2 films showed nearest neighbour hopping(NNH) at T > 200 K and 3D variable range hopping at T < 200 K. Such a change in charge transport mechanism (from …
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Josephson Junctions and Devices fabricated by Focused Electron Beam Irradiation
… current transport is shown to be compatible with variable range hopping (VRH). Barriers with the same length but a finite superconducting transition temperature showed a low bias resistance that is significantly lowered due to proximity coupling. Using purely resistive regions in combination with …
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Charge Transport Physics in Coordination Nanosheets (CONASHs)
… conductivity reveals an Efros–Shklovskii variable-range hopping transport, and the anomaly between Hall effect and thermoelectric coefficients is attributed to abnormal Hall effect in strongly disordered systems. The introduction of an EGT based on Lithium Perchlorate/Poly(ethylene oxide) …
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GaN-based vertical power devices
… analytical calculations and TCAD simulations. Variable-range-hopping through threading dislocations was identified as the main off-state leakage mechanism in these devices. The design space of leakage current of vertical GaN devices has been subsequently derived. Thirdly, a novel GaN vertical …
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Synthesis of large-area two-dimensional materials for vertical heterostructures
… low temperature demonstrated conduction through variable range hopping as a result of high defect densities. MoS2-Al2O3-MoS2 and MoS2-WS2 heterostructures are created using the low temperature, plasma-assisted growth processes. Extensive physical characterization of the films demonstrates good …
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Growth and characterization of epitaxial graphene films by Molecular Beam Epitaxy
… in the high temperature regime and a generalized Variable Range Hopping (VRH) type behavior at low temperatures. The low temperature transport of graphene grown on c-plane sapphire will be shown to be an interplay of both 2D and 3D Mott VRH. Whereas, Efros Shklovskii VRH plays a dominant role in …
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Thermoelectric and charge transport properties in doped and aligned conjugated polymers
… the thermoelectric power factor across a range of doped conjugated polymers. This system, harnessing the capabilities of a semi-automatic probe station and Peltier elements, ensures the expeditious generation of high-quality data, crucial for the precise measurement of conductivity and …
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Charge transport in nanopatterned PbS colloidal quantum dot arrays
… the conduction mechanism is nearest neighbor hopping, and the conductance is simply activated. At low source-drain bias voltages, the activation energy is given by the energy required to release a carrier from a trap state plus the activation over barriers resulting from site disorder. The …
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Spin and Charge Transport in Metallic Ferrimagnets and Disordered Magnetic Oxides
… follows what you’d expect from Mott’s variable range hopping, leading to a more difficult realization of spin transport across this material. Magnetometry measurements of the amorphous Y-Fe-O also confirm the antiferromagnetism of the material, leading to the conclusion that different …
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SYNTHESIS, ELECTRONIC AND OPTO-ELECTRONIC TRANSPORT PROPERTIES OF ATOMICALLY THIN 2D LAYERS OF MoS2, WSe2 and CuIn7Se11
… MoS2, the ac conductance (σ(ω); measured in the range of 10mHz < ω < 0.1 MHz) of atomically thin 2D layers of chemical vapor deposited (CVD) Molybdenum Disulphide (MoS2) as well as thin films of exfoliated flakes of MoS2, show "universal" power law behavior (with σ(ω) ~ ωs). The temperature …
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Optische und schwingungsspektroskopische Hochdruckuntersuchungen von Ladungsträgereigenschaften in herkömmlich und nach der Template-Methode synthetisierten leitfähigen Polypyrrolschichten
… in den Proben kann durch ein Mott Variable Range Hopping-Modell mit druckabhängiger charakteristischer Dimension beschrieben werden. Die Erhöhung des Drucks bewirkt einen Anstieg der Dimension, eine bessere Überlappung der Wellenfunktionen der Ladungsträger und eine Vergrößerung der …
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Emerging electronic materials : thin films of asphaltenes and coal nanoparticles for electronic devices and large area layer controlled 2-dimensional semiconductor synthesis
… carbon materials, both amorphous and with long-range order (for example, -C:H and reduced graphene oxide), have been used in a variety of optical and electronic applications from conductive additives and contact materials to transistors and photovoltaics. In contrast, the electronic properties …
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Electronic properties of topological semimetal candidates ACd$_2$Pn$_2$ (A = Eu, Sr; Pn = As, Sb)
… conductivity aligns with the characteristics of variable-range hopping insulators. Our results suggest that EuCd$_2$As$_2$ is a magnetic semiconductor rather than a topological Weyl semimetal. There is a significant discrepancy between DFT calculation prediction and experimental results. In a …
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