High resolution transmission electron microscopy of silicon-on-insulator formed by high dose oxygen implantation
- 19 January 1987
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 50 (3) , 152-154
- https://doi.org/10.1063/1.97645
Abstract
The structure of silicon-on-insulator formed by oxygen implantation at 150 keV with a dose of 1.6×1018 cm−2 is studied by high resolution transmission electron microscopy. Polyhedral oxygen precipitates are observed both in the top Si layer and in the substrate after 1150 °C annealing. The oxygen precipitates in the top Si layer coarsen at 1250 °C, but no precipitate can be found in the substrate at this temperature. A layer of polycrystalline silicon (polysilicon) exists near the top Si/buried oxide interface. Silicon crystals in the polysilicon layer also coarsen when the annealing temperature is changed from 1150 to 1250 °C. At 1150 °C, the buried oxide/substrate interface has many Si lamellas roughly parallel to the {100} wafer surface. The lamellar structure is broken up after 1250 °C annealing and is replaced by islandlike crystals which are strongly faceted on {100} planes. Defects are present in Si microcrystallites in both the polysilicon layer and the islandlike particles.Keywords
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