Patent ID: 9728414
Date: 2017-08-08
CPC Classifications: H01L

Claim:
1. A method of forming an electronic structure, the method comprising: depositing, in a first sputtering chamber, a base layer onto an oxide layer, the base layer comprising tantalum, wherein the depositing results in a temperature of the base layer reaching a first temperature; transferring the base layer and the oxide layer from the first sputtering chamber to a second sputtering chamber to avoid contamination, wherein the transferring is performed prior to depositing copper onto the base layer, and wherein the second sputtering chamber is at a second temperature that is lower than the first temperature; providing a vacuum in the second sputtering chamber while the temperature of the base layer is closer to the first temperature than to the second temperature; cooling the base layer in the second chamber using a gas flow without applying DC power until the base layer reaches the second temperature of the second chamber; and subsequently applying the DC power at a power level of 300 W or less while maintaining the gas flow to deposit a layer of copper on the base layer by physical vapor deposition in the second chamber.