METHOD FOR MAKING POLYCRYSTALLINE SILICON FILM RESISTORS

    公开(公告)号:DE3380614D1

    公开(公告)日:1989-10-26

    申请号:DE3380614

    申请日:1983-03-15

    Applicant: IBM

    Abstract: A method for making polycrystalline silicon film resistors is described which includes deposition of a polycrystalline silicon layer (14, 34) of very fine grain size upon an insulator surface (12, 28), followed by ion implantation of boron equal to or slightly in excess of the solubility limit of the polycrystalline silicon. This ion implantation is normally done using a screen silicon dioxide surface layer. The structure may be annealed at temperatures of between 800°C to 1100°C for 15 to 180 minutes to control the grain size of the polycrystalline silicon layer, homogenize the distribution of the boron ions throughout the entire film thickness and to raise the concentration of the boron in the silicon grains to the solid solubility limit. The suitable electrical contacts (52, 54) are now made to the polycrystalline silicon layer to form the resistor.

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