Method for manufacturing semiconductor device and apparatus for manufacturing thereof
View Patent ↗The object of the invention is to provide a method of manufacturing a semiconductor device and a processing apparatus for planarization wherein to form copper wiring in multiple layers. The removal of a residue of polishing by local electro polishing, the enhancement of the performance of planarization by using a grindstone and the reduction by small frictional force in electro polishing of damage, are enabled. To achieve the object, the following measures are taken. A residue of polishing of copper is removed by combining the detection of a local area including the residue of polishing of copper and local processing for electro polishing. As small-load processing for planarization is enabled by using electro polishing, multilayer interconnection structure using low-k material as a dielectric interlayer is also enabled. Plural pairs of small unit electrodes in a pair of which minus electrodes surround a plus electrode are provided to a tool for electro polishing, each electrode is connected to a power supply, pulse voltage is applied to each electrode and copper is electrolytically polished.
1. A processing apparatus for planarization, comprising:
a platen for rotating a semiconductor substrate, the platen being capable of holding the semiconductor substrate,
a tool for contacting the semiconductor substrate and for electropolishing the surface of the substrate,
a power supply for applying voltage to an electrode provided to the tool for electropolishing,
an electrolytic solution supplying means for supplying electrolytic solution to the semiconductor substrate, and
an image detector for detecting a polished state of the electropolished surface of the semiconductor substrate, wherein:
said tool for electropolishing comprises:
a plurality of electrode units, each electrode unit including a positive electrode and a negative electrode, to which positive voltage and negative voltage are applied respectively; and
a supporting body by which the plurality of electrode units is supported,
wherein the positive electrode is surrounded by the negative electrode, and
wherein pulse voltage is applied to the electrodes from the power supply.
2. A processing apparatus for planarization according to claim 1 , wherein:
the plurality of electrode units are arrayed linearly or at a predetermined interval on the supporting body forming the tool for electropolishing; and
plural grindstones having a height protruding beyond the end of the electrodes are provided to the supporting body.
3. A processing apparatus for planarization according to claim 1 , wherein said plurality of electrode units are arranged in a honeycomb configuration on the supporting body.
4. A processing apparatus for planarization according to claim 1 , wherein said power supply applies the positive voltage to the positive electrode and the negative voltage to the negative electrode, of each electrode unit of the plurality of electrode units.