Investigations on high temperature polyimide potentialities for silicon carbide power device passivation

Abstract. The characterization of the BPDA/PDA polyimide (PI) at high temperature up to 400• C, thanks to dielectric relaxation spectroscopy (DRS) in the 10 −1 Hz to 10 6 Hz frequency range, allows the determination of the dc electrical conductivity (σ dc ). In such a high temperature range, the dielectric spectra are modified by the extrinsic electrode polarization phenomenon (EP) response. A model is proposed which coupled to the DRS results allows evidencing and quantifying the effect of the EP. The proposed method gives a simple way to determine the intrinsic σ dc values from the effective ac dielectric response, improving the accuracy and reducing the duration of measurement.

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“…• C) [2][3][4][5]. Nevertheless, little is known about the electrical properties of the thermo-stable polymers above 200…”

Section: Introductionmentioning

confidence: 99%

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Diaham

Locatelli

Lebey

et al. 2009

Eur. Phys. J. Appl. Phys.

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“…Its critical field is around 5 MV/cm. One of its use is for second passivation in the microelectronic devices and particularly for high voltage and high temperature SiC devices [25], which encourages the use of this material is the facility of the deposit and its permittivity very close to the silicon oxide (≈ 3) that's mean, smaller than that of diamond (≈5.7).…”

Section: New Termination Architecturementioning

confidence: 99%

High termination efficiency using polyimide trench for high voltage diamond Schottky diode

Arbess

Isoird

Zerarka

et al. 2015

Diamond and Related Materials

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Using finite element simulations with Sentaurus TCAD (Technology Computer-Aided Design) software, a progress from simple and classic termination for a Schottky diode to new topology termination has been studied in this paper. A polyimide trench under field plate termination has been used. The efficiency increases from 67% for a simple field plate with optimum parameters up to 97%. The maximum electric field in the termination dielectric has been evaluated also. A wide study of the termination geometry has been made in order to extract the optimum parameters in two directions. The first one is to obtain a high efficiency regarding the breakdown voltage, and the second one is to have the minimum electric field peak at the termination edge.

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“…The flexible Print-Circuit Board was widely used in the electronic devices in order to reduce the size of devices. Polyimide (PI) that serves as a typical kind of engineering polymer material with advantages of high temperature resistance (400 o C), low temperature tolerance (-269 o C), radiation resistance, flexibility and excellent dielectric properties, has been used for the Print-Circuit Board [1][2]. For the flexible using, the size and weight of the electronic devices have been reduced every year, so it is necessary to reduce the thickness of the Print-Circuit Board used for electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Effect of surface fluorination on space charge behavior in multilayered polyimide films

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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In recent years, the multilayered polyimide films have been widely used in flexible PrintCircuit Board in order to reduce the thickness of the combination of the flexible PrintCircuit Board. The existence of space charge as a main reason for dielectric breakdown, has a great effect on breakdown characteristic. So it is important to study the space charge characteristics of the multilayered polyimide films. Fluorination can change the chemical component in surface layer of polymers and therefore can influence the charge injection from electrodes and affect the electrical properties of the surface layer. This paper presents a study aimed at clarifying the effect of fluorination on space charge behavior in multilayered polyimide films. Samples were fluorinated in a laboratory vessel at 328 K (55 ℃) using a F 2 /N 2 mixture with 20% F 2 by volume and 0.05 MPa (500 mbar) for respectively 15, 30, 45 and 60 minutes. The surface chemical compositions of the films were characterized by attenuated total reflection infrared analysis. The space charge distributions in multilayered polyimide films were measured by using the pulsed electroacoustic (PEA) method. Obtained results showed that the space charge distribution of multilayered film stacking with five fluorinated samples was quite different from that of multilayered film stacking with five untreated samples. It is also suggested that the fluorination can significantly suppress the injection of space charge.

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Investigations on high temperature polyimide potentialities for silicon carbide power device passivation

Cited by 28 publications

References 2 publications

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

High termination efficiency using polyimide trench for high voltage diamond Schottky diode

Effect of surface fluorination on space charge behavior in multilayered polyimide films

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