Patent ID: 9570290
Date: 2017-02-14
CPC Classifications: C23C,H01J,H01L

Claim:
1. A method of depositing a titanium dioxide encapsulation layer over memory stacks on a semiconductor substrate, comprising: (a) receiving a substrate having a plurality of magnetoresistive random access memory (MRAM) stacks or phase change random access memory (PCRAM) stacks thereon in a reaction chamber; (b) flowing a titanium-containing reactant into the reaction chamber and allowing the titanium-containing reactant to adsorb onto the surface of the substrate; (c) flowing an oxygen-containing reactant into the reaction chamber and allowing the oxygen-containing reactant to adsorb onto the surface of the substrate; (d) exposing the reaction chamber to plasma for a duration of about 0.5 seconds or less to drive a surface reaction between the titanium-containing reactant and the oxygen-containing reactant to thereby conformally deposit an encapsulation layer over the plurality of MRAM stacks or PCRAM stacks, wherein the encapsulation layer comprises titanium dioxide, and wherein the plasma is generated using an RF power density of about 1750 W/m (e) repeating (b)-(d) until the encapsulation layer reaches a final thickness; (f) flowing a second titanium-containing reactant into the reaction chamber and allowing the second titanium-containing reactant to adsorb onto the surface of the substrate; (g) flowing a second oxygen-containing reactant into the reaction chamber and allowing the second oxygen-containing reactant to adsorb onto the surface of the substrate; and (h) generating a second plasma with the plasma generator, and exposing the reaction chamber to the second plasma to drive a surface reaction between the second titanium-containing reactant and the second oxygen-containing reactant to thereby conformally deposit a second encapsulation layer over the encapsulation layer, the second encapsulation layer comprising titanium dioxide,