Characterization of the electrical properties of an InN epilayer using terahertz time-domain spectroscopic ellipsometry

2019 ◽  
Vol 58 (SC) ◽  
pp. SCCB22 ◽  
Author(s):  
Kenta Morino ◽  
Shingo Arakawa ◽  
Takashi Fujii ◽  
Shinichiro Mouri ◽  
Tsutomu Araki ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Spectroscopic Ellipsometry ◽  
Time Domain

scholarly journals Terahertz time-domain ellipsometry with high precision for the evaluation of GaN crystals with carrier densities up to 1020 cm−3

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Verdad C. Agulto ◽  
Toshiyuki Iwamoto ◽  
Hideaki Kitahara ◽  
Kazuhiro Toya ◽  
Valynn Katrine Mag-usara ◽  
...  
Keyword(s):  
Electrical Properties ◽  
High Voltage ◽  
Time Domain ◽  
High Frequency ◽  
Carrier Density ◽  
Power Devices ◽  
Reflection Configuration ◽  
Nondestructive Characterization ◽  
Thz Waves

AbstractGallium nitride (GaN) is one of the most technologically important semiconductors and a fundamental component in many optoelectronic and power devices. Low-resistivity GaN wafers are in demand and actively being developed to improve the performance of vertical GaN power devices necessary for high-voltage and high-frequency applications. For the development of GaN devices, nondestructive characterization of electrical properties particularly for carrier densities in the order of 1019 cm−3 or higher is highly favorable. In this study, we investigated GaN single crystals with different carrier densities of up to 1020 cm−3 using THz time-domain ellipsometry in reflection configuration. The p- and s-polarized THz waves reflected off the GaN samples are measured and then corrected based on the analysis of multiple waveforms measured with a rotating analyzer. We show that performing such analysis leads to a ten times higher precision than by merely measuring the polarization components. As a result, the carrier density and mobility parameters can be unambiguously determined even at high conductivities.

Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

1990 ◽  
Vol 55 (12) ◽  
pp. 2933-2939 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Klaus Richau
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Cellulose Acetate Membrane ◽  
Structure Parameters ◽  
Dc Electrical Conductivity ◽  
Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

scholarly journals 3D characterization of individual grains of coexisting high-pressure H2O ice phases by time-domain Brillouin scattering

2021 ◽  
Vol 130 (5) ◽  
pp. 053104
Author(s):  
Sathyan Sandeep ◽  
Théo Thréard ◽  
Elton De Lima Savi ◽  
Nikolay Chigarev ◽  
Alain Bulou ◽  
...  
Keyword(s):  
High Pressure ◽  
Time Domain ◽  
Brillouin Scattering ◽  
Individual Grains

Optical characterization of hybrid PEDOT:PSS/Si heterostructures by spectroscopic ellipsometry

2021 ◽  
Vol 717 (1) ◽  
pp. 92-97
Author(s):  
O. S. Kondratenko ◽  
S. V. Mamykin ◽  
T. S. Lunko ◽  
I. B. Mamontova ◽  
V. R. Romanyuk
Keyword(s):  
Spectroscopic Ellipsometry ◽  
Optical Characterization

Terahertz time-domain spectroscopy characterization of nitrocellulose in transmission and reflection configurations

Optik ◽  
2020 ◽  
Vol 224 ◽  
pp. 165711
Author(s):  
Noureddine Maamar ◽  
Mohamed Lazoul ◽  
Feriel Yasmine Latreche ◽  
Djalal Trache ◽  
Jean-Louis Coutaz
Keyword(s):  
Time Domain ◽  
Terahertz Time Domain Spectroscopy ◽  
Time Domain Spectroscopy ◽  
Transmission And Reflection
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