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High-density microwave plasma of SiH4/H2 for high rate growth of highly crystallized microcrystalline silicon films
Published online by Cambridge University Press: 22 February 2006
Abstract
The plasma parameters for the fast deposition of highly crystallized
microcrystalline silicon (µc-Si) films with low defect density are
presented using a high-density and low-temperature SiH4-H2 mixture
microwave plasma. A very high deposition rate of $\sim $65 Å/s was
achieved for a SiH4 concentration of 67% diluted in H2 with a
high Raman crystallinity Ic/Ia > 2.5 and a low defect density of
1−2 × 1016 cm−3 by adjusting the plasma conditions. Contrary
to the case of a conventional rf plasma, the defect density of the µc-Si films strongly depends on substrate temperature, Ts, and
increases with increasing Ts even if Ts is below 300 °C. This
indicates that the real temperature at the growing surface is higher than
the monitored value. A sufficient supply of deposition precursors such as
SiH3 at the growing surface under an appropriate ion bombardment is
effective for the fast deposition of highly crystallized µc-Si films as
well as for the suppression of the amorphous incubation and transition
interface layers at the initial growth stage.
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- © EDP Sciences, 2006
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