Patent ID: 8475634
Filing Date: 2013-07-02
Classification: C23C,H01J,H01L

Abstract:
1. A method of magnetically enhanced sputtering an electrically-conductive material onto interior surfaces of a trench comprising substantially vertical side walls and an aspect ratio of at least 10:1 formed in a semiconductor substrate that is supported by a pedestal, the method comprising: providing a magnetic field adjacent to a surface of a target formed at least in part from the electrically-conductive material to be sputtered onto the interior surfaces of the trench; applying a DC voltage between an anode and a cathode in a plurality of pulses, wherein the cathode includes the target; applying a pulsed high-frequency signal comprising a plurality of high-frequency pulses to the pedestal supporting the semiconductor substrate to generate a self-bias field adjacent to said semiconductor substrate, said high-frequency signal being applied to the pedestal at a frequency within a range of from about 1 MHz to about 70 MHz during the high-frequency pulses and each of the high frequency pulses having a duration that extends beyond termination of the pulse of the voltage between the anode and the cathode; and during each pulse of the DC voltage applied between the anode and the cathode, depositing the electrically-conductive material from the target onto the substantially vertical side walls of the trench formed in the semiconductor substrate.