Towards space charge measurements by (F)LIMM under DC electric field

Velazquez-Salazar, Amanda; Berquez, Laurent; Marty-Dessus, Didier

doi:10.1109/icd.2016.7547585

Cited by 8 publications

(6 citation statements)

References 8 publications

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“…Besides, to perform measurements on thin sample it is possible to work with a PEA cell offering a better resolution [18]. Finally in order to study the space charge distribution in thin sample we may also use the Laser Intensity Modulated Method -LIMM that has already been recently developed to work under applied voltage conditions [19].…”

Section: Space Charge Distribution Profilesmentioning

confidence: 99%

Analysis of the Gamma Irradiation Effect on PTFE Films by FTIR and DSC

Saidi-Amroun

Mouaci

Mezouar

et al. 2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Dielectric materials can be used in radiative environment that is why it is of major importance to determine their properties modifications with time. In this paper we focus our attention on PolyTetraFluoroEthylene (PTFE) films submitted to gamma radiations. We investigate the FTIR spectra and show that after exposure to Co 60 the crystallinity of the material is increasing. This result is confirmed by Differential Scanning Calorimetry (DSC) analysis. Some space charge distribution profiles obtained by the Pulse Electro Acoustic (PEA) method show that the irradiation favours the drift of injected charges toward the bulk. Obviously the dose of radiation must be carefully chosen in order to be able to perform electrical measurements. Indeed, we observed that if the radiation dose is too high the sample becomes fragile and most of the characterisation tools cannot be used.

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Section: Space Charge Distribution Profilesmentioning

confidence: 99%

Analysis of the Gamma Irradiation Effect on PTFE Films by FTIR and DSC

Saidi-Amroun

Mouaci

Mezouar

et al. 2018

2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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“…The Tikhonov regularization method implemented in this study proves to be reliable for calculating the space charge density profile 23 . After reconstructing the charge distribution r(z), the electric field profile E(z) can be obtained and confirmed by a thermal model calibration procedure 24 . The space charge distribution can then be determined from the derivative of the electric field.…”

Section: Limm Principlesmentioning

confidence: 99%

“…The following LIMM setup characteristics have been extensively detailed in previous research 24 . This part of the coupled system is composed of a laser diode (PMT100, 100 mW, 660 nm) which is modulated in the frequency range from 10 Hz to 10 kHz.…”

Section: Coupled Measuring Setupmentioning

confidence: 99%

Measurement setup to simultaneously explore the location and energy of trapped charges in thin polymer films

Mendoza-Lopez,

Berquez,

Boudou

et al. 2023

Review of Scientific Instruments

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This research proposes a unique system that combines charge density measurements by the laser intensity modulation method with optically excited current acquisitions using the photo-stimulated discharge technique (PSD). The purpose of this setup is to investigate the relationship between space charge properties (such as density, spatial depth, and time evolution) and the photocurrent-associated energies in order to gain new insights into the trap population and detrapping mechanisms in thin polymer films. This paper presents a description of the technical principles of both methods as well as the whole combined system. The results on a 12 μm-thick polyethylene naphthalate film show pyroelectric currents, which after processing indicate the formation of homocharges whose magnitude and depth decrease after light irradiation. The PSD currents allow the identification of two major energy bands at 3.4 and 5.9 eV (360 and 207 nm, respectively), possibly related to charge detrapping. In addition, current transients during constant wavelength irradiation show that incident photons can interact differently with trapped charges depending on the applied field.

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“…The (F)LIMM general principle and conventional set-up have been already described in [16], whereas its modifications towards an on-line equipment were recently detailed in [17]. Figure 2 The recorded current spectra are then proceeded according a deconvolution algorithm.…”

Section: Experimental Set-up For Limm/(f)limm Measurementsmentioning

confidence: 99%

On the importance of precise measurements of the optical properties of gold electrodes in LIMM/(F)LIMM

Carrasco

Marty-Dessus

Berquez

2021

2021 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Precise measurements of the optical properties of electrodes add value to the interpretation of the recorded current spectra when applying Laser Intensity Modulation Method (LIMM) for space charge density measurements, including also its version with focused laser ((F)LIMM). They allow to correctly account for the energy deposition in the metal electrode and in the dielectric material under study. In this work the refractive index (n) and the extinction coefficient (k) have been extracted from the recorded by spectroscopic ellipsometry spectra and then integrated in the model to account for the nature and real conditions of the electrode. Such approach improves modeling of the temperature required for extraction of the space charge. It is found that higher refractive indexes of the gold electrodes lead to an important increase of the signal/noise ratio, thus improving the sensibility of the method for space charge measurements. It also allows to probe much lower levels of space charge densities.

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Towards space charge measurements by (F)LIMM under DC electric field

Cited by 8 publications

References 8 publications

Analysis of the Gamma Irradiation Effect on PTFE Films by FTIR and DSC

Analysis of the Gamma Irradiation Effect on PTFE Films by FTIR and DSC

Measurement setup to simultaneously explore the location and energy of trapped charges in thin polymer films

On the importance of precise measurements of the optical properties of gold electrodes in LIMM/(F)LIMM

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