Patent ID: 6784072
Filing Date: 2004-08-31
Classification: H01L

Abstract:
A method for forming a semiconductor-on-insulator (SOI) substrate having a high quality buried oxide layer comprising the sequential steps of;selecting a semiconductor substrate containing silicon and having a major surface, heating said semiconductor substrate to a first temperature above 100 degrees C., first implanting oxygen into said major surface at a first energy to deposit oxygen in a range centered about a first depth whereby a buried damaged region is formed, heating/cooling said semiconductor substrate to a second temperature below 300 degrees C., second implanting oxygen into said major surface at a second energy to deposit oxygen in a range centered about a second depth whereby a buried amorphous region of semiconductor material is formed, third implanting oxygen into said major surface at a third energy and at a temperature in a range from 100 to 800 degrees C. to deposit oxygen in a range centered about a third depth whereby an additional buried damaged region is formed, and annealing said semiconductor substrate above 1100 degrees C. for a first time period to form said high quality buried oxide layer.