Fabrication of ultrafine anisotropic SiO2mask by the combination of electron beam lithography and SF6reactive ion beam etching using aluminum lift‐off technique
作者:
Tohru Nishibe,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
(AIP Available online 1994)
卷期:
Volume 12,
issue 4
页码: 2356-2360
ISSN:1071-1023
年代: 1994
DOI:10.1116/1.587764
出版商: American Vacuum Society
关键词: LITHOGRAPHY;MASKING;SILICON OXIDES;ETCHING;ELECTRON BEAMS;ALUMINIUM;ANISOTROPY;SiO2;Al
数据来源: AIP
摘要:
We propose a new process for fabrication of an ultrafine anisotropic SiO2mask, successfully combining electron beam (EB) lithography and SF6reactive ion beam etching using an Al lift‐off. SiO2etching had a high selectivity of 50 over Al with an SF6pressure of 0.9 mTorr and an ion energy of 300 V, because formation of AlF3near the surface prevented the etching of Al. EB patterns were precisely transferred to the SiO2mask with a vertical wall. Using this process, lines with widths of 70 nm and dot arrays composed of columns with diameters of 70 nm were realized.
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