Significant Improvement of Copper Dry Etching Property of a High-Pressure Hydrogen-Based Plasma by Nitrogen Gas Addition
Significant Improvement of Copper Dry Etching Property of a High-Pressure Hydrogen-Based Plasma by Nitrogen Gas Addition
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添加氮气显着改善高压氢基等离子体的铜干蚀刻性能
DOI:
10.1021/acsomega.8b03163
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发表时间:
2019
期刊:
影响因子:
4.1
通讯作者:
and Kiyoshi Yasutake
中科院分区:
文献类型:
--
作者:
Hiromasa Ohmi;Jumpei Sato;Yoshiki Shirasu;Tatsuya Hirano;Hiroaki Kakiuchi;and Kiyoshi Yasutake
The characteristics of copper (Cu) isotropic dry etching using a hydrogen-based plasma generated at 13.3 kPa (100 Torr) were improved dramatically by simply introducing a moderate amount of N2gas into the process atmosphere. A maximum Cu etch rate of 2.4 μm/min was obtained by nitrogen addition at a H2mixture ratio (CH2) of 0.9 and an input power of 70 W. The etch rate for the optimally N2-added plasma was 8 times higher than that for the pure H2plasma. The Cu etch rate increased with increasing input power. The maximum etch rate reached 3.1 μm/min at an input power of 100 W and aCH2of 0.9. The surface roughness of the etched copper decreased as a result of optimum N2addition. Furthermore, N2addition also improved the etch selectivity between Cu and SiO2such that the selectivity ratio reached 190. Finally, selective etching of a trench-patterned Si wafer with an electroplated Cu layer was demonstrated.
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