A Study of Etched ITO Characteristics by Inductively Coupled Plasma

유도 결합 플라즈마에 의해 식각된 ITO 특성 연구

The etching characteristics with etch rate of ITO thin films in an $O_2/BCl_3$/Ar plasma were investigated. The etch rate of ITO thin films increased with increasing $O_2$ content from 0 to 10 % in $BCl_3$/Ar plasma, whereas that of ITO decreased with increasing $O_2$ content from 10 % to 30 % in $BCl_3$/Ar plasma. The maximum etch rate of 65.9 nm/min for the ITO thin films was obtained at 10 % $O_2$ addition. The etch conditions were the RF power of 500 W, bias power of 200 W, and process pressure of 2 Pa. The analysis of x-ray photoelectron spectroscopy (XPS) was carried out to investigate the chemical reactions between the surfaces of ITO thin films and etch species.