Before the testing in the etching step, the experiment parts were prepared by lift-off technique which went through the following steps; coated 10 um wet photo-resist on 3” AlTiC wafer, photolithography for pattern the mask, developed the mask, deposited NiCr (90% of Ni and 10% of Cr) 250nm thickness by sputtering technique and finally removed the wet photo-resist.
The 3” of AlTiC wafers with a patterned NiCr mask are etched in a STS Multiplex-Pro Air Bearing Etch (high density) ICP system as illustrated in Fig. 1.
The system consisted of an rf 13.56 MHz generator which is capable up to 3kW output applied to inductive coil, used for igniting the plasma (The amount of rf power applied to inductive coil is called “coil power”).
A lower output generator (1.5kW maximum) rf 13.56 MHz applied to the platen electrode which held the substrate inside the chamber, was used to bias the substrate and enabled the independent bias control of the substrate (The amount of rf power applied to platen electrode is called “platen power”).
The etched wafers were determined the etching removal of both AlTiC and NiCr mask by stylus profiling technique (KLA-Tencor) and Scanning Electron Microscope (SEM) model XL30S FEG,Philips.