Patent ID: 7977167

Claim:
A method of producing a field effect transistor arrangement, comprising: providing a substrate having a first crystal surface orientation; forming a first layer above at least a first portion of the substrate, the first layer having a second crystal surface orientation different from the first crystal surface orientation; forming a second layer on at least a second portion of the substrate and adjacent to the first layer, the second layer having the first crystal surface orientation; forming a first buried oxide layer between the substrate and the first layer; forming micro-cavities in the second layer and oxidizing the micro-cavities, thereby forming a second buried oxide layer between the substrate and the second layer, wherein after formation of the micro-cavities and before oxidation of the micro-cavities, oxygen ions are implanted into the second layer, thereby forming oxygen rich precipitates in the second layer; forming a first field effect transistor in or on the first layer, the first field effect transistor having a first conductivity type; and forming a second field effect transistor in or on the second layer, the second field effect transistor having a second conductivity type.