An explanation of optical phenomena in non-crystalline semiconductors

Open Physics ◽  
2005 ◽  
Vol 3 (2) ◽  
Author(s):  
Ivan Banik
Keyword(s):  
Optical Absorption ◽  
Transport Properties ◽  
Electric Transport ◽  
Potential Barriers ◽  
Parabolic Profile ◽  
Crystalline Semiconductor ◽  
Exponential Tails ◽  
Optical Phenomena ◽  
Barrier Model

AbstractBarrier model of a non-crystalline semiconductor is described in this article. The most important optical phenomena, which are typical for this group of materials, are explained on the base of this model. The model assumes that in non-crystalline semiconductors the potential barriers exist, which separate certain microscopic areas from each other, assuming barriers possess a parabolic profile. This conception explains the rise of exponential tails of optical absorption at the end of optical edge as well as electroabsorption, photoelectric conductivity, photoluminescence, and others. Using this model, many electric transport properties of non-crystalline semiconductors can be explained successfully.

scholarly journals The effect of ageing on YBa2Cu3O7-x obtained by the photoacoustic method

2003 ◽  
Vol 35 (1) ◽  
pp. 23-29 ◽  
Author(s):  
Pantelija Nikolic ◽  
D. Radovic-Vasiljevic ◽  
K. Radulovic ◽  
D. Lukovic ◽  
S.S. Vujatovic ◽  
...  
Keyword(s):  
Thermal Diffusivity ◽  
Theoretical Model ◽  
Optical Absorption ◽  
Absorption Coefficient ◽  
Transport Properties ◽  
Carrier Lifetime ◽  
Modulation Frequency ◽  
Optical Absorption Coefficient ◽  
Electric Transport ◽  
Transmission Technique

Thermal diffusivity and electric transport properties of fourteen years old superconducting YBa2Cu3O7-x pellets were obtained using the photoacoustic transmission technique and then compared with freshly made superconducting samples. The theoretical model for photoacoustic (PA) detection configuration is given. The measured amplitude and phase PA signals, as a function of the modulation frequency, were numerically analyzed. The thermal diffusivity, the coefficient of the carrier diffusion, optical absorption coefficient and the excess carrier lifetime were calculated. The thermal diffusivity of freshly produced samples decreased, after ageing, from about 1.3?10-6 to about 6.1?10-7 m2/s.

First-principles study on the dielectric and transport properties of the LiNbO3-type CdPbO3

2017 ◽  
Vol 31 (05) ◽  
pp. 1750032
Author(s):  
Jing Zhang ◽  
San Huang Ke ◽  
Derwyn A. Rowlands
Keyword(s):  
Transport Properties ◽  
First Principles ◽  
Electronic Devices ◽  
Differential Resistance ◽  
Uniaxial Crystal ◽  
Dielectric Constants ◽  
First Principles Calculation ◽  
Electric Transport ◽  
Phonon Modes ◽  
Ir And Raman

Using first-principles calculation method, we have investigated the zone-center phonon modes, dielectric and transport properties of the LiNbO3-type CdPbO3. The results show that the relatively large peaks of infrared (IR) and Raman spectra mainly come from the [Formula: see text] and [Formula: see text] modes, respectively. The dielectric constant calculations reveal that this compound is positive uniaxial crystal and has the large dielectric constants. By investigating the electric transport properties using gold as electrode, the interesting negative differential resistance (NDR) effect can be observed, which reveals this compound should have important application in semiconducting electronic devices.

Optical Transitions in Chalcogenide Glasses From the Point of View of a Barrier-Cluster Model

2008 ◽  
Vol 39-40 ◽  
pp. 253-256
Author(s):  
Ivan Baník
Keyword(s):  
Optical Absorption ◽  
Low Temperatures ◽  
Cluster Model ◽  
Chalcogenide Glasses ◽  
Temperature Shift ◽  
Point Of View ◽  
Optical Transitions ◽  
Influence Of Temperature ◽  
Exponential Tails ◽  
Influence Of Temperature On

A barrier-cluster model of chalcogenide glasses is employed to analyze optical transitions near the absorption edge. The influence of temperature on the optical absorption is studied. The model is used to explain the temperature shift of exponential tails of the optical absorption and the temperature dependence of the optical forbidden-band width at low temperatures.

ChemInform Abstract: Synthesis, Crystal Structures, Magnetic and Electric Transport Properties of Eu11InSb9and Yb11InSb9.

ChemInform ◽  
2008 ◽  
Vol 39 (6) ◽  
Author(s):  
Sheng-qing Xia ◽  
Jonathan Hullmann ◽  
Svilen Bobev ◽  
Arif Ozbay ◽  
Edmund R. Nowak ◽  
...  
Keyword(s):  
Transport Properties ◽  
Crystal Structures ◽  
Electric Transport

scholarly journals Long- and short-range structures of Ti1−xHfxNi1.0/1.1Sn half-Heusler compounds and their electric transport properties

CrystEngComm ◽  
2019 ◽  
Vol 21 (21) ◽  
pp. 3330-3342 ◽  
Author(s):  
Matylda N. Guzik ◽  
Matthias Schrade ◽  
Raluca Tofan ◽  
Patricia A. Carvalho ◽  
Kristian Berland ◽  
...  
Keyword(s):  
Experimental Study ◽  
Transport Properties ◽  
Short Range ◽  
Heusler Compounds ◽  
Electric Transport

Experimental study reveals the apparent ordered arrangement of excess Ni at the nominally vacant sublattice in thermoelectric Ti1−xHfxNi1.0/1.1Sn half-Heusler compounds.

Influence of Eu Substitution for Y on the High Temperature Electric Transport Properties of YBaCo4O7+δ

2013 ◽  
Vol 724-725 ◽  
pp. 1029-1032 ◽  
Author(s):  
Qing Lin He ◽  
Feng Gao ◽  
Hong Zhang Song ◽  
Xing Hu
Keyword(s):  
Activation Energy ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Transport Properties ◽  
Power Factor ◽  
Electric Resistivity ◽  
Electric Transport ◽  
Seebeck Coefficients ◽  
Higher Power ◽  
Unmodified Sample

The electric resistivity, Seebeck coefficients and power factors of Y1-xEuxBaCo4O7+δ(x = 0.0, 0.05, 0.1, 0.2) ceramics were investigated from 400K to 1000K. The results show that the presence of Eu decreases electrical resistivity, and has little effect on Seebeck coefficients of the samples. The activation energy of conductivity is calculated by the Arrhenius plots in the semiconductive region. According to power factors, the optimum Eu substitution amount is x = 0.1, which results in a higher power factor of 67.5 μWm-1K-2at 1000K, 30% higher than unmodified sample YBaCo4O7+δ.

Electric transport properties of ultra-and nanoporous glasses in electrolyte solutions

2007 ◽  
Vol 69 (5) ◽  
pp. 571-578 ◽  
Author(s):  
L. E. Ermakova ◽  
M. P. Sidorova ◽  
N. A. Zhura
Keyword(s):  
Transport Properties ◽  
Electrolyte Solutions ◽  
Electric Transport
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