Patent ID: 8974617
Filing Date: 2015-03-10
Classification: G03F,H01L,Y10T

Abstract:
1. A method for transferring a sheet of graphene to a metal contact bump, comprising: providing a substrate comprising one or more metal contact bumps on a surface of the substrate, the metal contact bumps being surrounded by a passivation layer; placing a sheet of graphene on the substrate, the sheet of graphene covering the one or more metal contact bumps, aligning an imprinter device with respect to the substrate, the imprinter device comprising an imprinter substrate having a front surface that is provided with one or more cavities through the front surface, each cavity having a rim portion, wherein a number of the one or more cavities is at least the same as a number of the one or more metal contact bumps, wherein the imprinter device is positioned so that each of the one or more metal contact bumps is aligned with one of the cavities; lowering the imprinter device with respect to the substrate so that each of the one or more metal contact bumps becomes enclosed within a corresponding cavity, thereby arranging the sheet of graphene such that it is in contact with top and side surfaces of the one or more metal contact bumps; pushing down the imprinter device until each rim portion cuts through the sheet of graphene; lifting up the imprinter device, so as to leave a graphene sheet portion attached to the substrate and covering each of the one or more metal contact bumps, with unattached graphene sheet portions remaining on the substrate in between each of the one or more metal contact bumps; and removing the unattached graphene sheet portions by cleaning.