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Carbon nitride (CNx) thin films have been synthesized by hot filament assisted r.f. plasma-enhanced chemical vapor deposition with negative bias methods on Si (100) substrates. The influences on the thin film structure and hardness characteristics of r.f. power and substrate negative bias have been emphatically investigated. The optimal preparation parameters have been summarized as follows: r.f. power of 200W, substrate negative bias of -200V, substrate temperature of about 600°C, total reactive gas pressure of about 110Pa, flow ratio of CH4 to N2 of 1: 5.5.
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