Patent ID: 8691058
Filing Date: 2014-04-08
Classification: C23C,H01J,H01L

Abstract:
1. A method of depositing a metallization structure, comprising: providing a substrate, depositing a TaN layer by providing a target formed at least in part from tantalum to be sputtered onto the substrate, the depositing of the TaN layer comprising supplying a sputtering gas comprising nitrogen and inert gas, applying a power supply between an anode and a cathode in a plurality of first pulses, and applying a magnetic field adjacent to a surface of the target, the cathode including the target, the first pulses being supplied with a frequency in the range 10 Hz to 1000 Hz and a duty cycle of between 0.01% and 20% and producing a current density of between 0.1 A/cm during each of the first pulses of the power supply, reactively sputtering tantalum from the target onto the substrate to form a TaN seed layer, the TaN seed layer having a thickness in a range from about 0.2 nm to less than about 1 nm, and depositing a Ta layer onto the TaN seed layer by providing a magnetic field adjacent to the surface of the target, the depositing of the Ta Layer comprising supplying an inert sputtering gas, applying the power supply between an anode and a cathode in a plurality of second pulses, applying a magnetic field adjacent to a surface of the target, applying a high-frequency signal to a pedestal supporting the substrate to generate a self-bias field adjacent to the substrate, and, during each of the second pulses of the power supply, depositing tantalum from the target onto the TaN seed layer to form the Ta layer, the cathode including the target, the pulses being applied with a frequency in the range 10 Hz to 1000 Hz and a duty cycle of between 0.01% and 20% and producing a current density of between 0.1 A/cm wherein the high-frequency signal is not applied to the pedestal during the forming of the TaN seed layer and is applied to the pedestal during the depositing of the Ta layer onto the TaN seed layer.