Abstract:
New compositions and methods of using those compositions as protective layers during the production of semiconductor and MEMS devices are provided. The compositions comprise a cycloolefin copolymer dispersed or dissolved in a solvent system, and can be used to form layers that protect a substrate during acid etching and other processing and handling. The protective layer can be photosensitive or non-photosensitive, and can be used with or without a primer layer beneath the protective layer. Preferred primer layers comprise a basic polymer in a solvent system.
Abstract:
PROBLEM TO BE SOLVED: To provide a method of forming a MEMS device.SOLUTION: The method of forming a MEMS device (10) includes a step of forming a sacrificial layer (34) over a substrate (12). The method further includes a step of forming a metal layer (42) over the sacrificial layer (34) and a step of forming a protection layer (44) overlying the metal layer (42). The method further includes a step of etching the protection layer (44) and the metal layer (42) to form a structure (56) having a remaining portion of the protection layer formed over a remaining portion of the metal layer. The method further includes a step of etching the sacrificial layer (34) to form a movable portion of the MEMS device, wherein the remaining portion of the protection layer protects the remaining portion of the metal layer during the step of etching of the sacrificial layer to form the movable portion of the MEMS device (10).