期刊
MICRO & NANO LETTERS
卷 13, 期 8, 页码 1085-1089出版社
INST ENGINEERING TECHNOLOGY-IET
DOI: 10.1049/mnl.2017.0610
关键词
micromachining; micromechanical devices; elemental semiconductors; silicon; surface morphology; sputter etching; crystal microstructure; nanofabrication; microstructures; silicon wafer; etching characteristics; etched surface morphology; silicon micromachining; low concentration TMAH solution; aqueous tetramethylammonium hydroxide solution; silicon wet anisotropic etching; bulk micromachining; reducing agent hydroxylamine; microelectromechanical systems; Si
资金
- Department of Science and Technology, New Delhi, India [SR/S3/MERC/072/2011]
- Council of Scientific and Industrial Research (CSIR), New Delhi, India [03(1320)/14/EMR-II]
An aqueous tetramethylammonium hydroxide (TMAH) solution is widely used for silicon wet anisotropic etching to perform bulk micromachining for the fabrication of microstructures on a silicon wafer. To reduce the etching time to increase the productivity, etchant must provide high etch rate. In the present work, the etching characteristics of Si{110} in low concentration TMAH (5 wt%) with the addition of various concentrations (5-20%) of reducing agent hydroxylamine (NH2OH) have been studied to increase the etch rate of Si{110} to reduce the etch time for the fabrication of microstructures. Moreover, it is aimed to enhance the undercutting at convex corner for the fast release of the structure. The etch rate of Si{110} and the undercutting at convex corners with the addition of NH2OH increases by more than three times that in pure TMAH. In addition to the etch rate and undercutting, the effect of NH2OH on etched surface morphology is investigated systematically. The present study is focused to enhance the application of wet etching in silicon micromachining for the fabrication of various kinds of microstructures for applications in microelectromechanical systems.
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