Title :
Space charge measurement by the Thermal Step method and TSDC in PMMA
Author :
Vella, Nathalie ; Joumha, A.E.I. ; Toureille, Alain
Author_Institution :
Lab. d´´Electrotech., Univ. des Sci. et Tech. du Languedoc, Montpellier, France
Abstract :
The Thermal Step method elaborated by A. Toureille at the Laboratoire d´Electrotechnique de Montpellier is based on the measurement of thermodilatation current due to the application of a thermal step, to one side of the sample. The deconvolution of this current gives the repartition of electrical field and space charges inside the insulator. This method has been used for the first time to study repartition of polarization and space charge in polar material such as PMMA (polymethyl-methacrylate). Coupling this technique with Thermally Stimulated Discharge Current method (TSDC), it is possible to see minority carriers which could be masked by majority carriers. It allowed us to reveal injection, which was not visible when only the thermal step method was used, because it was masked by important polarization
Keywords :
carrier density; dielectric polarisation; electrets; minority carriers; organic insulating materials; polymers; space charge; thermally stimulated currents; PMMA; TSDC; Thermal Step method; current deconvolution; majority carriers; minority carriers; polar material; polarization; polymethyl-methacrylate; space charge measurement; thermodilatation current; Charge measurement; Current measurement; Deconvolution; Dielectrics and electrical insulation; Electrodes; Extraterrestrial measurements; Polarization; Polymers; Space charge; Temperature;
Conference_Titel :
Electrets, 1994. (ISE 8), 8th International Symposium on
Conference_Location :
Paris
Print_ISBN :
0-7803-1940-0
DOI :
10.1109/ISE.1994.514773
