유도 결합 플라즈마를 이용한 TiN 박막의 식각 특성
Etch Characteristics of TiN Thin Films in the Inductively Coupled Plasma System
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This study described the effects of RF power, DC bias voltage, chamber pressure and gas mixing ratio on the etch rates of TiN thin film and selectivity of TiN thin film to SiO₂ with BCl₃/Ar gas mixture. When the gas mixing ratio was BCl₃(20%)/Ar(80%) with other conditions were fixed, the maximum etch rate of TiN thin film was 170.6 nm/min. When the DC bias voltage increased from -50 V to -200 V, the etch rate of TiN thin film increased from 15 nm/min to 452 nm/min. As the RF power increased and chamber pressure decreased, the etch rate of TiN thin film showed an increasing tendency. When the gas mixing ratio was BCl₃(20%)/Ar(80%) under others conditions were fixed, the intensity of optical emission spectra from radical or ion such as Ar(750.4 nm), Cl+(481.9 nm) and Cl2+(460.8 nm) was highest. The TiN thin film was effectively removed by the chemically assisted physical etching in BCl3/Ar ICP plasma.
Abstract
This study described the effects of RF power, DC bias voltage, chamber pressure and gas mixing ratio on the etch rates of TiN thin film and selectivity of TiN thin film to SiO₂ with BCl₃/Ar gas mixture. When the gas mixing ratio was BCl₃(20%)/Ar(80%) with other conditions were fixed, the maximum etch rate of TiN thin film was 170.6 nm/min. When the DC bias voltage increased from -50 V to -200 V, the etch rate of TiN thin film increased from 15 nm/min to 452 nm/min. As the RF power increased and chamber pressure decreased, the etch rate of TiN thin film showed an increasing tendency. When the gas mixing ratio was BCl₃(20%)/Ar(80%) under others conditions were fixed, the intensity of optical emission spectra from radical or ion such as Ar(750.4 nm), Cl+(481.9 nm) and Cl2+(460.8 nm) was highest. The TiN thin film was effectively removed by the chemically assisted physical etching in BCl3/Ar ICP plasma.
참고문헌 (13)
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