Determination of Saturation Drift Velocity of Carrier in Semiconductors from Current-Voltage Characteristics in Space Charge Limited Range

1968 ◽  
Vol 7 (1) ◽  
pp. 94-95 ◽  
Author(s):  
Nobuo Kawamura
Keyword(s):  
Space Charge ◽  
Drift Velocity ◽  
Limited Range ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Space Charge Limited

scholarly journals Electron transport in AlGaN/GaN HEMT-like nanowires: Effect of depletion and UV excitation

2021 ◽  
Vol 24 (04) ◽  
pp. 407-412
Author(s):  
A.V. Naumov ◽  
◽  
V.V. Kaliuzhnyi ◽  
S.A. Vitusevich ◽  
H. Hardtdegen ◽  
...  
Keyword(s):  
Electron Transport ◽  
Space Charge ◽  
Ultraviolet Excitation ◽  
Gan Hemt ◽  
Current Voltage ◽  
Significant Difference ◽  
Current Voltage Characteristics ◽  
Uv Excitation ◽  
Biosensor Applications ◽  
Space Charge Limited

In this work, we have investigated the features of electron transport in AlGaN/GaN transistor-like heterostructures with nanowires of different width. These nanostructures are studied extensively because of their great electronic and sensing advantages for electronic biosensor applications. We study the depletion effects and impact of ultraviolet excitation on the electron transport in sets of nanowires of different width from 1110 down to 185 nm. We have found significant difference in electrical characteristic’s behavior between wide (1110…480 nm) and narrow (280…185 nm) nanowires and have observed regions related to space-charge-limited transport for the narrowest nanowires. Also, we obtained evident dependence of nanowire’s current-voltage characteristics on the wavelength and energy of UV excitation. External UV excitation allows us to control the depletion widths in nanowires and effectively tune space-charge-limited transport.

Investigation of Density and Velocity of Abrikosov Vortices in YBa2Cu3O7–x Superconducting Thin Films with a Laser-Written Channel for Easy Vortex Motion

1970 ◽  
Vol 17 (2) ◽  
pp. 180-185
Author(s):  
Lina STEPONAVICIENE ◽  
Jonas SULCAS ◽  
Arturas JUKNA ◽  
Valentina PLAUSINAITIENE ◽  
Adulfas ABRUTIS ◽  
...  
Keyword(s):  
Vortex Motion ◽  
Limited Range ◽  
Coherent Motion ◽  
Superconducting Transition ◽  
Magnetic Vortices ◽  
Current Voltage ◽  
Coherent Vortex ◽  
Current Voltage Characteristics ◽  
Abrikosov Vortices

The 0.3-mm-thick, 50-mm-wide and 100-mm-long YBa2Cu3O7-x superconducting bridges with a laser-written, single, Π-shaped channel have been investigated by means of electronic transport measurements at temperatures below the onset of the bridge's superconducting transition temperature. Our results demonstrate that the coherent vortex motion confined in the P-shaped channel can be used for determination of both the density and velocity of Abrikosov magnetic vortices in the channel. The coherent motion of Abrikosov vortices expresses itself as Josephson-like voltage steps, observed on the current-voltage characteristics of our microbridges, measured at zero external magnetic field, in a limited range of temperatures and bias currents. The steps' amplitude corresponds to the entrance of an additional vortex-antivortex pair into the channel's area and change in the vortex velocity. This amplitude also affects the increase of the Lorentz force for energy dissipative drift of the magnetic flux in the channel, but it does not increase, however, with the increase of the biasing current. We present and discuss the results of experimentally measured and calculated energy dissipation, which originated from variations in the vortex density and velocity when the vortices are moving along the channel of the superconducting bridge.http://dx.doi.org/10.5755/j01.ms.17.2.489

Space-Charge-Limited Currents in n-i-n Devices Incorporating Glow-Discharge and Hot-Wire Deposited a-Si:H

1997 ◽  
Vol 467 ◽  
Author(s):  
Edith C. Molenbroek ◽  
C. H. M. Van Der Werf ◽  
K. F. Feenstra ◽  
F. Rubinelli ◽  
R. E. I. Schropp
Keyword(s):  
Space Charge ◽  
Defect Layer ◽  
Negative Bias ◽  
Hot Wire ◽  
Interface Defects ◽  
Current Voltage ◽  
Large Asymmetry ◽  
Current Voltage Characteristics ◽  
Space Charge Limited Currents ◽  
Space Charge Limited

ABSTRACTSpace-charge-limited currents have been examined in a wide variety of n-i-n devices. If the devices were completely symmetric, the current-voltage characteristics would be identical for positive and negative bias, but in several devices differences between the two polarities were observed. In order to understand in which part of the device these differences originate, the influence of the contacts and interfaces on the JV characteristics were examined by using different metal top contacts, different n-layers and different i-layers. Ag and Al top contacts gave minor differences between the polarities, whereas with Cr contacts no differences were observed. Incorporation of a defect layer in the i-layer results in asymmetric JV curves. We have observed a small asymmetry in an experimental device, and a large asymmetry using AMPS modeling. N-i-n devices appear to be a sensitive probe for interface defects.

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