Study on the effects of different carrier gases on characteristics of supersaturated environment in the one/multi-section growth tube

The supersaturation profiles in one/multi-section growth tube were predicted under the conditions of different carrier gases for two kinds of typical supersaturation achieving methods. The results show that Lewis number (Le) of the carrier gas is an important factor affecting the supersaturation profiles. For the one-section growth tube, the carrier gas with smaller Le is beneficial to higher level and flatter trend of supersaturation profiles for method 1, where supersaturated environment is achieved by a cool saturated flow into a warm-walled growth tube. However, for the carrier gas of larger Le, the higher level but less stable supersaturation profiles are presented from method 2, where a warm saturated flow into a cold-walled growth tube. With the carrier gas of large Le (>1) from method 1 and the carrier gas of small Le (<0.5) from method 2, efficient supersaturated environment cannot be achieved under the ordinary condition. In the multi-section growth tube, the more minimum number of the sections ...