Density evaluation of remotely-supplied hydrogen radicals produced via tungsten filament method for SiCl4 reduction

作者：Dahmani Fatima Zohra; Okamoto Yuji; Tsutsumi Daiki; Ishigaki Takamasa; Koinuma Hideomi; Hamzaoui Saad; Flazi Samir; Sumiya Masatomo^*

来源：Japanese Journal of Applied Physics, 2018, 57(5): 051301.

DOI：10.7567/JJAP.57.051301

Effect of the hydrogen radical on the reduction of a silicon tetrachloride (SiCl4) source was studied. The hydrogen radicals were generated using a tungsten (W) filament in a generation chamber, and were remotely supplied to another reaction chamber. The density of the hydrogen radical was estimated from the optical transmittance of 600-nm-wavelength light through phosphate glass doped with tungsten oxide (WO3). Lifetime of the hydrogen radical seemed sufficiently long, and its density as supplied to the reaction chamber was estimated to be on the order of 10(12)cm(-3). Signal intensity of the peak corresponding to SiCl4 (m/z = 170) detected by quadrupole-mass measurement was confirmed to decrease owing to the reaction with the remotely-supplied hydrogen radical. This indicates the possibility that chemically-stable SiCl4, as one of the by-products of the Siemens process, can be reduced to produce silicon.

• 出版日期2018-5