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Deposition Materials

Benefits of Bonding Sputtering Targets

  1. A material can transfer heat through its thickness faster when the material is thinner. For most sputtering R&D guns, the thickness of the target is reduced to half when it is bonded to a backing plate because the gun has a maximum thickness allowance. The copper backing plate comprises the other half of the thickness. The thinner target can cool more effectively than a thicker target because the distance that the heat generated on the surface of the target has to travel to reach the cooled side is reduced.
  2. A ceramic material can cool more efficiently when bonded. The target is in intimate contact with the conductive solder layer which draws the heat from the target surface and into the copper backing plate. The copper backing plate is in contact with the water cooled gun so the heat is transferred through both pieces of copper and is removed through the cooling water.
  3. Some ceramic sputtering targets will crack during sputtering due to thermal shock regardless of whether the target is bonded or the ramping procedure used to condition the target. Bonded targets can usually continue to be used even after a target crack occurs, where typically an un-bonded target cannot.

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