Patent ID: 8796116
Filing Date: 2014-08-05
Classification: H01L

Abstract:
1. A method of reducing the metal content of a silicon on insulator structure comprising: forming a sacrificial oxide layer on a front surface of a silicon device layer of a silicon on insulator structure, the silicon on insulator structure comprising a handle wafer, the silicon device layer and a dielectric layer between the handle wafer and the silicon layer, the dielectric layer and silicon device layer forming an interface between the dielectric layer and silicon device layer, the sacrificial oxide layer and the silicon device layer forming an interface between the sacrificial oxide layer and the silicon device layer; heating the silicon on insulator structure having a sacrificial oxide layer thereon to a temperature T cooling the silicon on insulator structure from T removing the sacrificial oxide layer and a portion of the metal atoms at the sacrificial oxide layer-silicon device layer interface from the silicon-in-insulator structure.