Patent ID: 7514357

Claim:
A method of manufacturing a semiconductor device, comprising: forming a via hole and a trench on a semiconductor substrate by an etching process; coating a photoresist on an entire surface of the semiconductor substrate to fill the via hole and the trench; patterning the photoresist by partially removing the photoresist above the trench; exposing a bottom side of the trench by etching the photoresist in an atmosphere containing oxygen (O 2 ) gas using a first power condition of 0 watts (W) and a second power condition ranging from 1000 W to 3000 W; removing a polymer defect in the trench by performing an etching process in a first plasma atmosphere under first process conditions; removing the photoresist remaining on the semiconductor substrate by consecutively etching in an O 2 plasma atmosphere under O 2 plasma process conditions including a substantially constant O 2 plasma etching pressure and then in an ozone (O 3 ) plasma atmosphere under O 3 plasma predetermined process conditions including an O 3 plasma etching pressure higher than the substantially constant O 2 plasma etching pressure, wherein the O 2 plasma process conditions further comprise sequentially a first flow rate of O 2 gas, then a second flow rate of O 2 gas greater than the first flow rate of O 2 gas, then a third flow rate of O 2 gas lower than the second flow rate of O 2 gas; and performing a wet cleaning process so as to remove a residue of the photoresist.