Determination of carrier diffusion coefficient and lifetime in single crystalline CVD diamonds by light-induced transient grating technique

2010 ◽  
Vol 207 (9) ◽  
pp. 2058-2063 ◽  
Author(s):  
T. Malinauskas ◽  
K. Jarašiūnas ◽  
E. Ivakin ◽  
N. Tranchant ◽  
M. Nesladek
Keyword(s):  
Diffusion Coefficient ◽  
Transient Grating ◽  
Single Crystalline ◽  
Carrier Diffusion

Carrier diffusion characterization in epitaxial 4H–SiC

2001 ◽  
Vol 16 (2) ◽  
pp. 524-528 ◽  
Author(s):  
Paulius Grivickas ◽  
Jan Linnros ◽  
Vytautas Grivickas
Keyword(s):  
Diffusion Coefficient ◽  
Temperature Dependence ◽  
Power Law ◽  
Hole Mobility ◽  
Drift Mobility ◽  
Substantial Decrease ◽  
Transient Grating ◽  
Carrier Diffusion

Carrier diffusivity has been experimentally determined in low-doped n-type epitaxial 4H–SiC over a wide injection range using a Fourier transient grating technique. The data showed that, with injection, the diffusion coefficient increased from a minority-hole diffusivity Dh = 2.3 cm2/s to an ambipolar diffusivity Da = 4.2 cm2/s at approximately 1016 cm−3 with a substantial decrease occurring at higher injections. The derived Dh value corresponded to a minority-hole drift mobility of μh = 90 cm2/Vs, about 30% lower than available majority-hole mobilities. Also, the temperature dependence of the ambipolar diffusivity in the 296–523 K range has been determined. It followed a power law Da ∼ T−1.3 which notably differed from the expected one using the majority-hole mobility temperature dependence.

DETERMINATION OF DIFFUSION COEFFICIENT OF THE TURKISH TRONA IN WATER

1996 ◽  
Vol 05 (01) ◽  
pp. 3-11 ◽  
Author(s):  
GÜLHAYAT NASÜN-SAYGILI ◽  
HASANCAN OKUTAN
Keyword(s):  
Diffusion Coefficient

Lithium Ion Diffusion Through Glassy Carbon Plate

1997 ◽  
Vol 496 ◽  
Author(s):  
M. Inaba ◽  
S. Nohmi ◽  
A. Funabiki ◽  
T. Abe ◽  
Z. Ogumi
Keyword(s):  
Diffusion Coefficient ◽  
Glassy Carbon ◽  
Lithium Ion ◽  
Ion Diffusion ◽  
Irreversible Capacity ◽  
Oxidation Current ◽  
Current Curve ◽  
Carbon Plate ◽  
Lithium Ion Diffusion

ABSTRACTThe electrochemical permeation method was applied to the determination of the diffusion coefficient of Li+ion (DLi+) in a glassy carbon (GC) plate. The cell was composed of two compartments, which were separated by the GC plate. Li+ions were inserted electrochemically from one face, and extracted from the other. The flux of the permeated Li+ions was monitored as an oxidation current at the latter face. The diffusion coefficient was determined by fitting the transient current curve with a theoretical one derived from Fick's law. When the potential was stepped between two potentials in the range of 0 to 0.5 V, transient curves were well fitted with the theoretical one, which gaveDLi+ values on the order of 10−8cm2s−1. In contrast, when the potential was stepped between two potentials across 0.5 V, significant deviation was observed. The deviation indicated the presence of trap sites as well as diffusion sites for Li+ions, the former of which is the origin of the irreversible capacity of GC.

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