Space charge measurement under very low voltage for assessing interface effects due to measurement conditions

Zheng, Lin; Holé, Stephane

doi:10.1109/icd53806.2022.9863461

Cited by 1 publication

(1 citation statement)

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“…However, the sensibility was too small to directly observe the voltage across the interface between materials. Recently, the pressure-wave-propagation (PWP) method [18,19] has greatly improved its sensibility making it possible to observe directly the contact potential at interfaces under ultra low or zero electric field application [20][21][22]. The gain in sensibility of the PWP setup was made possible by an optimization of the pressure wave generator presented in Reference [23] and by using averaging.…”

Section: Introductionmentioning

confidence: 99%

Study of contact conditions at conductor/insulator interfaces used in space charge distribution measurements

Zheng¹,

Holé²

2023

Phys. Scr.

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Interfaces play a major role on charge injection in dielectrics under high voltage. As a consequence, space charge distribution measurements under high voltage may depend on the chosen interface conditions during the tests. In this paper, it is shown that various mountings of an insulating polymer (polyethylene) in a space charge distribution measurement setup develop very different intrinsic dipoles at the interfaces generating in turn an interface voltage that may interact with energy levels between the electrode and the insulator and thus with injection laws. These dipoles are minimal when the insulating polymer has hot-pressed carbon-loaded polymer electrodes or is coupled with silicone oil to carbon-loaded EVA electrodes. On the contrary aluminum coating or direct contact with aluminum in presence of silicone oil for the coupling generates large dipoles compared to gel coupling or with gold coating. The measurements were carried out with an ultra sensible pressure-wave-propagation measurement setup under very low electric field (\pm30 V/mm at most) for calibration purpose. Aluminum and stainless steel was used for the setup wave-guide in order to check its influence. Interface voltage up to 5 V could be estimated with an uncoated sample in contact with aluminum through silicone oil.

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