Patent ID: 7563348
Filing Date: 2009-07-21
Classification: C25D

Abstract:
1. An electroplating head, comprising: a main chamber having a fluid entrance and a fluid exit, the main chamber being configured to contain a flow of electroplating solution from the fluid entrance to the fluid exit; a membrane defined to form a portion of a sidewall of the main chamber; an anode chamber defined opposite the membrane from the main chamber such that the membrane separates the anode chamber from the main chamber; an anode disposed within the anode chamber, wherein the anode is electrically connected to a power supply, and wherein the anode is oriented in a substantially vertical manner within the anode chamber so as to be substantially parallel to the membrane and so as to enable natural circulation within the anode chamber; and a porous electrically resistive material disposed at the fluid exit, the flow of electroplating solution being required to traverse from the main chamber through the porous electrically resistive material, wherein the electroplating head is configured to be positioned above an upper surface of a semiconductor wafer to be electroplated such that the fluid exit faces downward toward the upper surface of the semiconductor wafer with the porous electrically resistive material positioned proximate to and parallel to the upper surface of the semiconductor wafer.