Patent ID: 8623231
Filing Date: 2014-01-07
Classification: C09K,H01L

Abstract:
1. A method for etching an ultra thin film, comprising: providing a substrate having the ultra thin film formed thereon, the ultra thin film having a thickness less than about 100 Angstrom; patterning a photosensitive layer formed over the ultra thin film; etching the ultra thin film with the patterned photosensitive layer to form a pattern in the ultra thin film; removing the photosensitive layer after etching the ultra thin film; wherein the etching includes utilizing an etch material with a diffusion resistant carrier so that the etch material is prevented from diffusing to a region underneath the photosensitive layer and removing portions of the ultra thin film underneath the photosensitive layer, the etch material including a first chemical having an organic acid and a second chemical having a metal hydroxide and the diffusion resistant carrier includes a solvent and a glycerine mixture.