Study of relevance of the SIMOX defect type on yield of radiation-tolerant device test structures

We studied the relevance of the SIMOX defect type on the operation of radiation tolerant device test structures. Fabrication of the devices was preceded by extensive characterization of the substrates including novel non-destructive techniques. The overall results have shown good yield and BOX hardness obtained in standard dose SIMOX material with the low density of light point defects (HF defects included). The 170 nm BOX was found only radiation tolerant. The yet insufficiently reduced density of silicon inclusions in the medium dose buried oxide SIMOX was found to be the major limiting factor of the hardness.