The Study of the Formation of Thin SOI Structure by SIMOX with Water Plasma

Abstract

The biggest drawback of the widely application of SIMOX-SOI material is the low yield and the high cost which mainly due to the long implantation time by conventional beamline implanter. An implanter without an ion mass analyzer is used to fabricate SOI materials by H 2 O + , HO + , and O + ions implantation using water plasma. Based on the consideration that the masses of the three ions of are quite close, their depth profiles in as-implanted wafers will not disperse much, which makes it possible for the formation of a single buried oxide layer by choosing the appropriate energy and dose. The results show that it exits a dose window at fixed implantation energy to form desirable thin or ultra-thin SOI structure with the buried oxide layer free of silicon islands. Compared to conventional SIMOX method, the sample implanted at the same dose and energy has thicker BOX layer. This probably caused by the heavy oxygen damaged region with hydrogen-induced defects in as-implanted wafer appears to be the adsorption center for the outside oxygen to diffuse into the silicon during the high-temperature annealing process.