On the nature of high field charge transport in reinforced silicone dielectrics: Experiment and simulation

Journal Article · Sun Aug 07 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4945373· OSTI ID:22597740

Huang, Yanhui; Schadler, Linda S. ^[1]

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1. Department of Material Science and Engineering, Rensselaer Polytechnic Institute, 110 8th street, Troy, New York 12180 (United States)

The high field charge injection and transport properties in reinforced silicone dielectrics were investigated by measuring the time-dependent space charge distribution and the current under dc conditions up to the breakdown field and were compared with the properties of other dielectric polymers. It is argued that the energy and spatial distribution of localized electronic states are crucial in determining these properties for polymer dielectrics. Tunneling to localized states likely dominates the charge injection process. A transient transport regime arises due to the relaxation of charge carriers into deep traps at the energy band tails and is successfully verified by a Monte Carlo simulation using the multiple-hopping model. The charge carrier mobility is found to be highly heterogeneous due to the non-uniform trapping. The slow moving electron packet exhibits a negative field dependent drift velocity possibly due to the spatial disorder of traps.

• OSTI ID: 22597740
• Journal Information: Journal of Applied Physics, Vol. 120, Issue 5; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARRIER MOBILITY
CHARGE CARRIERS
CHARGE DISTRIBUTION
CHARGE TRANSPORT
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
DIELECTRIC MATERIALS
ELECTRONS
INJECTION
MONTE CARLO METHOD
SILICONES
SPACE CHARGE
SPATIAL DISTRIBUTION
TIME DEPENDENCE
TUNNEL EFFECT
VELOCITY