A method for measuring space charge distribution of polymer dielectric thin films
A space charge and measurement method technology, applied in the direction of measuring devices, measuring electrical variables, instruments, etc., can solve the problems of partial area distortion of space charge distribution curve, cover up the real information of charge distribution, actual distribution deviation, etc., to reduce unreasonable oscillation , Avoid the process of differential operation and improve the effect of efficiency
Active Publication Date: 2021-11-09
TONGJI UNIV
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Therefore, in the data analysis of the measured signal, due to the existence of noise in the current signal and the characteristics of the above algorithm itself, the obtained electric field distribution curve may have certain jitter
In this case, the space charge distribution curve obtained after the differential calculation of the electric field may have unreasonable distributions such as partial area distortion and frequent polarity reversal, and there is a large deviation from the actual distribution
Therefore, during data processing, the electric field calculation results often need to be smoothed in the later stage, but this may cover up the real information of part of the charge distribution
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[0040] In this embodiment, the scaling method in the frequency domain is taken as an example to directly calculate the space charge distribution of the thermal pulse data processing. The first type of Fredholm integral equation (response current expression) involved in the data analysis of space charge measured by thermal pulse method is as follows:
[0041]
[0042] Among them, i(t) is the time-domain representation of the response current, x is the spatial position, t is the time, ΔT(x, t) is the temperature change of the polymer dielectric film, A is the radiation of the polymer dielectric film hit by the pulsed laser The illuminated area, d is the thickness of the polymer dielectric film, g(x) is the distribution function, for non-polar media, g(x) is expressed as:
[0043] g(x)=ε 0 ε r (α ε -α x )E(x) (2)
[0044] Among them, α ε is the temperature coefficient of dielectric constant, α x is the thermal expansion coefficient of the polymer dielectric film, ε 0 i...
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The present invention relates to the field of polymer dielectric films, in particular to a method for measuring the space charge distribution of polymer dielectric films, comprising the following steps: performing metallization on both sides of the polymer dielectric film and applying a DC voltage; The metallized electrode on the side hits the pulsed laser, measures the response current generated, and constructs the time-domain response current expression; combined with the Poisson equation and the one-dimensional heat conduction equation, the time-domain response current expression is Fourier transformed, and the The frequency domain expression of the response current related to the space charge distribution; the frequency domain expression is approximated at high frequency to obtain the approximate frequency domain expression; the approximate frequency domain expression is solved to obtain the space charge distribution. Compared with the prior art, the efficiency of data analysis is improved, the sensitivity of data analysis to noise is reduced, and the accuracy of measurement results is improved.
Description
technical field [0001] The invention relates to the field of polymer dielectric films, in particular to a method for measuring space charge distribution of polymer dielectric films. Background technique [0002] The space charge distribution in polymer dielectric thin films has a crucial impact on their working performance. Among the existing measurement methods for space charge, the thermal pulse method has the advantages of short measurement period and high resolution, and is especially suitable for the measurement of micron-sized polymer films. The method generates thermal disturbance by applying a thermal pulse to the sample, and the thermal pulse drives charges during propagation inside the medium, causing a measurable thermally responsive displacement current. The data analysis of the displacement current involves the first kind of Fredholm integral equation, which needs to be solved by a suitable numerical calculation method. Traditionally, in the data analysis of n...
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IPC IPC(8): G01R29/24
CPCG01R29/24
Inventor 郑飞虎黄陈昱张冶文
Owner TONGJI UNIV