Study of Nonlinear Current-Voltage Characteristic of Semiconductor Ceramic by the Method of Tilted Energy Band

2014 ◽  
Vol 941-944 ◽  
pp. 547-550
Author(s):  
Chao Fang ◽  
Liang Yan Chen
Keyword(s):  
Grain Size ◽  
Energy Band ◽  
Breakdown Field ◽  
Electrical Characteristics ◽  
Current Voltage ◽  
Non Linear ◽  
Semiconducting Ceramics ◽  
Current Voltage Characteristics ◽  
Effective Carrier ◽  
Grain Boundary Barrier

A analytic method for the calculation of the electrical characteristics of semiconducting ceramics is suggested. This paper put forward the concept of effective carrier concentration. Electrical characteristics under extra electric field have been calculated by the method of tilted energy band. The non-linear current-voltage characteristics with different grain sizes has been obtained. The results pointed out that the current-voltage characteristics divide into three regions: Linear region before breakdown field, nonlinear region near breakdown field and upturn region after breakdown field; The grain boundary barrier leads to the strong non-linear characteristics, which has nothing to do with the grain size. With the grain size decreasing, the breakdown field increases. The results are compared with experimental data.

Preparation and Electrical Characteristics of (100), (111), and Randomly Oriented PZT Thin Films

1994 ◽  
Vol 361 ◽  
Author(s):  
Chang Jung Kim ◽  
Dae Sung Yoon ◽  
Joon Sung Lee ◽  
Chaun Gi Choi ◽  
Won Jong Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Hysteresis Loops ◽  
Test System ◽  
Electrical Characteristics ◽  
Pzt Thin Films ◽  
Pole Figures ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Drying Conditions

ABSTRACTThe (100), (111) and randomly oriented PZT thin films were fabricated on Pt/Ti/Coming 7059 glass using sol-gel method. The thin films having different orientation were fabricated by different drying conditions for pyrolysis. The preferred orientations of the PZT thin films were observed using XRD, rocking curves, and pole figures. The microstructures were investigated using SEM. The hysteresis loops and capacitance-voltage characteristics of the films were investigated using a standardized ferroelectric test system. The dielectric constant and current-voltage characteristics of the films were investigated using an impedance analyzer and pA meter, respectively. The films oriented in a particular direction showed superior electrical characteristics to the randomly oriented films.

scholarly journals Non-Linear Current-Voltage Characteristics of Graphite/Piezoelectric Composite.

2002 ◽  
Vol 110 (1280) ◽  
pp. 310-313 ◽  
Author(s):  
Toshitaka OTA ◽  
Naoto YAMAUCHI ◽  
Keiji DAIMON ◽  
Yasuo HIKICHI ◽  
Hidetoshi MIYAZAKI ◽  
...  
Keyword(s):  
Piezoelectric Composite ◽  
Linear Current ◽  
Current Voltage ◽  
Non Linear ◽  
Current Voltage Characteristics

scholarly journals Влияние межмолекулярного взаимодействия на нелинейно-оптические свойства в системах COANP-углеродные наночастицы

2022 ◽  
Vol 48 (4) ◽  
pp. 29
Author(s):  
С.В. Лихоманова ◽  
Н.В. Каманина
Keyword(s):  
Carbon Nanoparticles ◽  
Optical Limiting ◽  
Combined System ◽  
Global Trends ◽  
Current Voltage ◽  
Non Linear ◽  
Current Voltage Characteristics ◽  
Linear Optical ◽  
Conjugated Molecule

The main results of non-linear optical, spectral and current-voltage characteristics research of pyridine organic conjugated molecule-carbon nanoparticles combined system have been presented. The perspective of these materials further study in global trends of modern search of materials for optical limiting has been demonstrated also in the present paper.

Metastable Defect Distributions in CIGS Solar Cells and Their Impact on Device Efficiency

2007 ◽  
Vol 1012 ◽  
Author(s):  
Malgorzata Igalson
Keyword(s):  
Carrier Transport ◽  
Theoretical Calculations ◽  
Electrical Characteristics ◽  
Current Voltage ◽  
Device Efficiency ◽  
Current Voltage Characteristics ◽  
Cigs Solar Cells ◽  
Metastable Effects ◽  
The Impact ◽  
Metastable Defect

AbstractMetastabilities in the electrical characteristics of CIGS devices are commonly observed phenomena originating from persistent changes of shallow and deep levels distributions within the absorber. We examine characteristic changes induced by voltage bias and light together with their relaxation behavior and interpret them as the consequences of a negative-U type of centers predicted by theoretical calculations of Lany and Zunger. It is shown how the properties of these centers justify a model of p+ layer explaining specific features of light and dark current-voltage characteristics. The discussion showing the impact of various charge distributions on carrier transport is presented. The arguments are provided, that centers responsible for metastable effects are also to blame for majority of photovoltaic losses exhibited in various devices.

Effect of WO3 Doping on Microstructural and Electrical Properties of ZnO-Pr6O11 Based Varistor Materials

2013 ◽  
Vol 591 ◽  
pp. 54-60
Author(s):  
Xiu Li Fu ◽  
Yan Xu Zang ◽  
Zhi Jian Peng
Keyword(s):  
Grain Size ◽  
Electrical Properties ◽  
Grain Growth ◽  
Doping Level ◽  
Nonlinear Coefficient ◽  
Current Voltage ◽  
Average Grain Size ◽  
Current Voltage Characteristics ◽  
Voltage Performance

The effect of WO3doping on microstructural and electrical properties of ZnO-Pr6O11based varistor materials was investigated. The doped WO3plays a role of inhibitor in ZnO grain growth, resulting in decreased average grain size from 2.68 to 1.68 μm with increasing doping level of WO3from 0 to 0.5 mol%. When the doping level of WO3was lower than 0.05 mol%, the nonlinear current-voltage characteristics of the obtained varistors could be improved significantly with increasing amount of WO3doped. But when the doping level of WO3became higher, their nonlinear current-voltage performance would be dramatically deteriorated when more WO3was doped. The optimum nonlinear coefficient, varistor voltage, and leakage current of the samples were about 13.71, 710 V/mm and 13 μA/cm2, respectively, when the doping level of WO3was in the range from 0.03 to 0.05 mol%.

Electrical Injection and Transport in Films of Semiconductor Nanocrystals

1999 ◽  
Vol 571 ◽  
Author(s):  
D.S. Ginger ◽  
N.C. Greenham
Keyword(s):  
Semiconductor Nanocrystals ◽  
Cdse Nanocrystals ◽  
Temperature Dependent ◽  
Metal Electrodes ◽  
Current Voltage ◽  
Disordered Films ◽  
Effective Mobility ◽  
Current Voltage Characteristics ◽  
Space Charge Limited Currents ◽  
Effective Carrier

ABSTRACTWe study injection and transport in thin disordered films of CdSe nanocrystals between metal electrodes, We investigate the current-voltage characteristics of these devices as a function of electrode material, nanocrystal size, and temperature. We also measure the photocurrent response of these devices, and find that the photocurrent action spectra follow the quantum-confined absorption spectra of the nanocrystals. For dissimilar top and bottom electrodes, we find that the devices are highly rectifying. By studying space charge limited currents in these devices, we are able to place a lower bound on the effective carrier mobility in such films, and we find that the effective mobility is strongly field dependent. We find that the conductivity is strongly temperature dependent, and is qualitatively consistent with an activated hopping process at temperatures above 180 K.

Optical and Electrical Properties of Some Organic Thin Films for Optoelectronic Applications

2011 ◽  
Vol 337 ◽  
pp. 426-429
Author(s):  
S.B. Chen ◽  
Zhi You Zhong
Keyword(s):  
Thin Films ◽  
Experimental Studies ◽  
Visible Region ◽  
Organic Thin Films ◽  
Optical Transmittance ◽  
Vacuum Sublimation ◽  
Semiconductor Thin Films ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Effective Carrier

Organic semiconductor thin films of bis-(2-methyl-8-quinolinolato)-4-(phenyl-phenolato) -aluminium-(III) (BAlq), N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)benzidine (NPB), and tris-(8- hydroxyquinoline) aluminum (Alq) were prepared by the vacuum sublimation technique. The optical properties in the UV-visible region of the thin films were investigated by optical transmittance and absorbance spectra. The optical energy gaps were obtained from direct allowed transitions at room temperature by Tauc’s law. The Urbach energy and the slope of Urbach edge were estimated by the Urbach-edges method, respectively. Furthermore, the current-voltage characteristics of organic thin films were analyzed, and the different slopes in the lower and higher voltage regions were observed. From the experimental studies, the effective carrier mobility, free carrier density, and electrical conductivity were also evaluated respectively.

Preparation and Electrical Characteristics of Bi4-xYbxTi3O12 Ceramics

2013 ◽  
Vol 591 ◽  
pp. 212-215 ◽  
Author(s):  
Chong Qing Huang ◽  
J. Liu ◽  
M. Chen ◽  
X.A. Mei
Keyword(s):  
Remanent Polarization ◽  
Bismuth Titanate ◽  
Hysteresis Loops ◽  
Differential Resistance ◽  
Layered Perovskite ◽  
Electrical Characteristics ◽  
Current Voltage ◽  
Layered Perovskite Structure ◽  
Current Voltage Characteristics ◽  
Large Leakage Current

The electrical properties of Yb-doped bismuth titanate,Bi4-xYbxTi3O12 (BYbT) ceramics prepared by a conventional electroceramic technique were investigated. XRD analyses revealed Bi-layered perovskite structure in all samples. SEM micrographs showed randomly oriented and plate-like morphology. For the samples with x=0.25 and 1.0 the current-voltage characteristics exhibited negative differential resistance behaviors and their P-V hysteresis loops were characterized by large leakage current, whereas for the samples with x=0.5 and 0.75 the current-voltage characteristics showed simple ohmic behaviors and their P-E hysteresis loops were the saturated and undistorted hysteresis loops. The remanent polarization ( Pr ) and coercive field (Ec) of the BYbT ceramic with x=0.75 were above 16μC/cm2 and 75KV/cm , respectively.

Non-linear current–voltage characteristics of electrically conducting carbon nanotube–polystyrene composites

2002 ◽  
Vol 4 (22) ◽  
pp. 5655-5662 ◽  
Author(s):  
P. C. P. Watts ◽  
W. K. Hsu ◽  
D. P. Randall ◽  
H. W. Kroto ◽  
D. R. M. Walton
Keyword(s):  
Carbon Nanotube ◽  
Electrically Conducting ◽  
Linear Current ◽  
Current Voltage ◽  
Non Linear ◽  
Current Voltage Characteristics
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