Effect of dopants on chemical mechanical polishing of silicon
In microelectronic manufacturing, chemical mechanical polishing (CMP) of silicon is becoming a more and more important process. This work investigates the effect of dopants on CMP of silicon. A high boron concentration is found to reduce the removal rate. The boron induced reduction is clearly demonstrated by observing boron diffused areas on a wafer protrude during polishing. A high phosphorus concentration enhances the removal rate. It is also found that the removal rate is lower for the Si(111) compared to the Si(100) orientation.
chemical mechanical polishing silicon boron phosphorus orientation