Publisher DOI: 10.1063/1.4917208
Title: Electrical conduction mechanism in bulk ceramic insulators at high voltages until dielectric breakdown
Language: English
Authors: Neusel, Claudia 
Jelitto, Hans 
Schneider, Gerold A. 
Issue Date: 16-Apr-2015
Publisher: American Inst. of Physics
Source: Journal of Applied Physics 15 (117): 154902 (2015-04-21)
Journal or Series Name: Journal of applied physics 
Abstract (english): In order to develop and verify a dielectric breakdown model for bulk insulators thicker than 100μm, the knowledge of the dominating conduction mechanism at high electric fields, or respectively voltages, is necessary. The dielectric breakdown is the electrical failure of an insulator. In some existing breakdown models, ohmic conduction is assumed as dominating conduction mechanism. For verification, the dominating dc conduction mechanism of bulk insulators at room temperature was investigated by applying high voltages up to 70kV to the insulator until dielectric breakdown occurs. Four conduction models, namely, ohmic, space charge limited, Schottky, and Poole-Frenkel conduction, were employed to identify the dominating conduction mechanism. Comparing the calculated permittivities from the Schottky and Poole-Frenkel coefficients with experimentally measured permittivity, Schottky and Poole-Frenkel conduction can be excluded as dominating conduction mechanism. Based on the current density voltage characteristics (J-V-curve) and the thickness-dependence of the current density, space charge limited conduction (SCLC) was identified to be the dominating conduction mechanism at high voltages leading to dielectric breakdown. As a consequence, breakdown models based on ohmic conduction are not appropriate to explain the breakdown of the investigated bulk insulators. Furthermore, the electrical failure of the examined bulk insulators can only be described correctly by a breakdown model which includes SCLC as conduction mechanism.
ISSN: 1089-7550
Institute: Keramische Hochleistungswerkstoffe M-9 
Type: (wissenschaftlicher) Artikel
Funded by: Support by the German Research Foundation (DFG) under Project No. SCHN 372/17-1.
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