کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1785675 | 1023390 | 2015 | 7 صفحه PDF | دانلود رایگان |
• We compared two different transformer-coupled toroidal plasma(TCTP) reactors.
• The difference of two TCTP reactors was in inner-surface structures.
• Fluorine(F) atoms produced from NF3 plasma in TCTP were used to etch a silicon wafer.
• Grooved-surface reactor showed higher silicon etch-rate than normal-surface reactor.
• Higher neutral gas temperature in the former reactor made more F atoms by pyrolysis.
Transformer-coupled toroidal plasma (TCTP) has found applications in versatile fields as a high-power-density plasma source. However, most research on TCTP has focused on plasma states in the TCTP, without any change in reactor structures. Therefore, in this paper, we present a study on the effects of inner-surface modification of a TCTP reactor on plasma conditions. Using two types of reactors with different inner surfaces, the silicon-wafer etch rate by fluorine atoms from dissociated NF3 gas molecules is compared. Then a computer simulation, which derives various plasma parameters, is carried out. As a result, the TCTP reactor with a grooved inner surface shows a higher etch rate than the reactor with a normal inner surface. The computer simulation suggests the reason for this etch rate difference is that the reactor with the grooved inner surface structure has a higher neutral gas temperature than the reactor with the normal inner surface so that more pyrolytic dissociation, resulting in a higher fluorine atom density, is achieved. Our results may be useful for those fields that require a higher neutral temperature or a higher degree of pyrolysis.
Journal: Current Applied Physics - Volume 15, Issue 3, March 2015, Pages 183–189