Relation between etching profile and voltage–current shape of sintered SiC etching by atmospheric pressure plasma

D C SEOK; S R YOO; K I LEE; Y S CHOI; Y H JUNG

doi:10.1088/2058-6272/aaf9e9

Plasma Science and Technology > 2019 > 21(4): 45504-045504. > DOI: 10.1088/2058-6272/aaf9e9

D C SEOK, S R YOO, K I LEE, Y S CHOI, Y H JUNG. Relation between etching profile and voltage–current shape of sintered SiC etching by atmospheric pressure plasma[J]. Plasma Science and Technology, 2019, 21(4): 45504-045504. DOI: 10.1088/2058-6272/aaf9e9

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Relation between etching profile and voltage–current shape of sintered SiC etching by atmospheric pressure plasma

Plasma Technology Research Center, National Fusion Research Institute, Gunsan City 54004, Republic of Korea

Funds: This work was supported by National Research Council of Science & Technology (NST) grant (No. CRC-15-07-KIER) and the ‘Plasma Convergence & Fundamental Research’ through the National Fusion Research Institute of Korea (NFRI) funded by the Government funds.

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Received Date: August 28, 2018

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Abstract

Abstract

Sintered silicon carbide (SiC) was etched by a dielectric barrier discharge source. A high voltage bipolar pulse was used with helium gas for the plasma generation. One stable filament plasma was generated and could be used for SiC etching. As the processing gas (NF₃) mixing rate increased, the width and depth of the etching profile became narrower and deeper. The differentiated V–Q Lissajous method was used for measuring the capacitances (C_eq) of the electrode after the plasma turned on. The width of the etching profile was proportional to C_eq. As the current peak value I_smx of the substrate current increased, the volume removal rate of SiC increased. The etch depth was proportional to the ratio of I_smx to C_eq. Additionally, because of the different characteristics of the plasma disks on SiC substrate by the voltage polarity, the etching profile was unstable. However, in high NF₃ mixing process, the etching profile became stable and deeper.
- dielectric barrier discharge,
- silicon carbide,
- plasma etching,
- filament discharge,
- surface charge

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Relation between etching profile and voltage–current shape of sintered SiC etching by atmospheric pressure plasma