Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 49, Issue 9, Pages -Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.49.096503
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Flat and smooth 45 degrees micromirrors were successfully fabricated on a 4-in. silicon wafer by means of wet anisotropic etching at the industrially practical temperature of 80 degrees C using tetramethylammonium hydroxide (TMAH) solution with added NCW-1002, a nonionic surfactant with little environmental load. The effects of the TMAH concentration and the amount of NCW-1002 added were extensively investigated, and it was found that a high TMAH concentration (25 wt %) and a very low amount of NCW-1002, approximately 10 vol ppm, are the optimum conditions to fabricate optically smooth and geometrically flat micromirrors. The mechanism underlying the effects of the concentration of the surfactant is discussed in relation to the clouding point of the surfactant-added TMAH solution. (C) 2010 The Japan Society of Applied Physics
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