Patent ID: 7368396

Claim:
A process for etching a semiconductor substrate using a deep reactive ion etching process to produce slots in the substrate, the process comprising: applying a first layer comprising a photosensitive material selected from the group consisting of epoxy resins, polyhydroxystyrene resins, polyurethane coating materials, acrylic-based coating materials, cresol-novolac resins, polyvinyl acetate coatings, polyester coatings, and polyamide coatings to a first surface of substrate to provide an etch mask material layer on the first surface of the substrate; applying a non-photosensitive etch stop material selected from the group consisting of epoxy resins, polyhydroxystyrene resins, polyurethane coating materials, acrylic-based coating materials, cresol-novolac resins, polyvinyl acetate coatings, polyester coatings, and polyamide coatings to a second surface of the substrate to provide an etch stop material layer on the second surface of the substrate, wherein the first layer and etch stop material layer have similar solubilities in one or more organic solvents as predicted by a Hansen solubility parameter (HSP) and a Hilderbrand solubility parameter for each of the etch mask material layer and the etch stop material layer; etching the substrate from the first surface of the substrate to provide a slot in the substrate; and removing the etch mask material layer and the etch stop material layer by contacting the first surface and the second surface of the substrate with a single organic solvent.