プラズマ CVD により DLC 全面成膜したシリコン薄膜の引張強度とばらつきの解析

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  • Tensile Strength and Deviation Analysis of Micro-scaled Silicon Structure with Full-coated PECVD DLC Film

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The influence of deposition bias voltage on the tensile properties of single-crystal silicon microstructure fully coated with 150 nm-thick diamond like carbon film using plasma enhanced chemical vapor deposition were investigated. The fabricated structure had dimensions of 120 μm long, 4 μm wide and 5 μm thick. PECVD DLC film has the average sp2 phase of 44%, sp3 phase of 20% and hydrogen content of 36% from photoelectron spectroscopy (XPS), and thermal desorption spectrometry (TDS) analysis. With increasing negative bias voltage, sp3 phase increased and sp2 phase, hydrogen content decreased. The tensile strength of DLC coated SCS samples was 13.2%-29.6% higher compared to the bare silicon samples. The -400 V bias showed the highest strength of 3.94 GPa, which was in a good agreement with the measurement result of DLC fracture toughness. The deviation in strength reduced significantly with increasing negative bias voltage.

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