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Characterization of crystallographic defects in thermally oxidized
SIMOX materials
Luis Felipe Giles*, Yasuo Kunii
Abstract
Crystallographic defects present in thermally oxidized SIMOX (separation by implanted osqgen) materials have been
characterirsd by me;ms of plan view transmission electron microscopy (PVTEM) and defect etching studies. It has been observed
that oxidation induced stacking faults (OISF) are formed in the silicon ovcrlaycr of SIMOX substrates during thermal oxidations
at temperatures varying from ‘900 to I IOO”C. In this range of temperature. the OISF length increases continuously \vith time and
temperature Lvhile the OISF densit! shows ;I &crease uith oxidation temperature. It has also bwn observed that at temperatures
of 1175°C and higher no OlSFs are formed in the silicon overlayer 01‘ SlMOX substrates. This beha\,iwr may he explained by,
a decrease in the 11~1s of interstitials emitted during oxidation due to visco-elastic deformation of the thermal oxide at high
temperatures. |
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