The Current Crowding Effect in ZnO Nanowires with a Metal Contact

Kryvchenkova, Olga; Cobley, Richard J.; Kálna, K.

doi:10.1016/j.matpr.2015.04.052

Cited by 3 publications

(3 citation statements)

References 24 publications

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“…Tunnelling was considered for both electrons and holes. Using the universal Schottky tunnelling model, the localized tunnelling rates were calculated through the structure of the semiconductor close to the interface [21,22].…”

Section: Methodsmentioning

confidence: 99%

The effects of surface stripping ZnO nanorods with argon bombardment

et al. 2015

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ZnO nanorods are used in devices including field effects transistors, piezoelectric transducers, optoelectronics and gas sensors. However, for efficient and reproducible device operation and contact behaviour, surface contaminants must be removed or controlled. Here we use low doses of argon bombardment to remove surface contamination and make reproducible lower resistance contacts. Higher doses strip the surface of the nanorods allowing intrinsic surface measurements through a cross section of the material. Photoluminescence finds that the defect distribution is higher at the near-surface, falling away in to the bulk. Contacts to the n-type defect-rich surface are near-Ohmic, whereas stripping away the surface layers allows more rectifying Schottky contacts to be formed. The ability to select the contact type to ZnO nanorods offers a new way to customize device behaviour.

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Section: Methodsmentioning

confidence: 99%

The effects of surface stripping ZnO nanorods with argon bombardment

et al. 2015

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“…The authors also argued that it is important to avoid current crowding so as to avoid early failures. [22,23] From these considerations, it is inferred that at high enough current densities, the CCE can become significant, causing specimens to fail earlier.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Effect of Peak Current Density on Tensile Properties of AZ31B Magnesium Alloy

2021

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An investigation into the effects, including the athermal effect, of a pulsed current on AZ31B magnesium alloy was carried out. Different peak current densities were applied at the same temperature under uniaxial tensile testing. The results indicate that the stress reduction caused by the increasing peak current density is independent of temperature. The strain hardening coefficient also shows a similar trend. The fracture strain shows the optimum value due to the current crowding effect.

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“…[29][30][31][32] The carrier transport model uses a drift-diffusion approximation for the GaAs sample assuming semi-infinite geometry, incorporating tunneling between the tip and the sample which is selfconsistently coupled with Poisson's equation, thus accounting for long-range Coulomb interactions.…”

Section: Methodsmentioning

confidence: 99%

The role of probe oxide in local surface conductivity measurements

Barnett

Kryvchenkova

Wilson

et al. 2015

Journal of Applied Physics

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A four-point surface conductivity probe suitable for in situ ultrahigh vacuum conductivity measurements Rev.Local probe methods can be used to measure nanoscale surface conductivity, but some techniques including nanoscale four point probe rely on at least two of the probes forming the same low resistivity non-rectifying contact to the sample. Here, the role of probe shank oxide has been examined by carrying out contact and non-contact I V measurements on GaAs when the probe oxide has been controllably reduced, both experimentally and in simulation. In contact, the barrier height is pinned but the barrier shape changes with probe shank oxide dimensions. In non-contact measurements, the oxide modifies the electrostatic interaction inducing a quantum dot that alters the tunneling behavior. For both, the contact resistance change is dependent on polarity, which violates the assumption required for four point probe to remove probe contact resistance from the measured conductivity. This has implications for all nanoscale surface probe measurements and macroscopic four point probe, both in air and vacuum, where the role of probe oxide contamination is not well understood. V C 2015 AIP Publishing LLC. [http://dx.

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The Current Crowding Effect in ZnO Nanowires with a Metal Contact

Cited by 3 publications

References 24 publications

The effects of surface stripping ZnO nanorods with argon bombardment

The effects of surface stripping ZnO nanorods with argon bombardment

Effect of Peak Current Density on Tensile Properties of AZ31B Magnesium Alloy

The role of probe oxide in local surface conductivity measurements

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