Removal of 10-nm contaminant particles from Si wafers using CO2 bullet particles
SCIE
SCOPUS
- Title
- Removal of 10-nm contaminant particles from Si wafers using CO2 bullet particles
- Authors
- Inho Kim; Kwang-seok Hwang; Lee, J
- Date Issued
- 2012-04-11
- Publisher
- Springer
- Abstract
- Removal of nanometer-sized contaminant particles (CPs) from substrates is essential in successful fabrication of nanoscale devices. The particle beam technique that uses nanometer-sized bullet particles (BPs) moving at supersonic velocity was improved by operating it at room temperature to achieve higher velocity and size uniformity of BPs and was successfully used to remove CPs as small as 10 nm. CO2 BPs were generated by gas-phase nucleation and growth in a supersonic nozzle; appropriate size and velocity of the BPs were obtained by optimizing the nozzle contours and CO2/He mixture fraction. Cleaning efficiency greater than 95% was attained. BP velocity was the most important parameter affecting removal of CPs in the 10-nm size range. Compared to cryogenic Ar or N-2 particles, CO2 BPs were more uniform in size and had higher velocity and, therefore, cleaned CPs more effectively.
- Keywords
- ano-bullet; CO2; Supersonic nozzle; Gas-phase nucleation; Cleaning efficiency; CONTOURED LAVAL NOZZLE; SUPERSONIC EXPANSION; DYNAMICS; BEAM
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13126
- DOI
- 10.1186/1556-276X-7-211
- ISSN
- 1931-7573
- Article Type
- Article
- Citation
- NANOSCALE RESEARCH LETTERS, vol. 7, no. 1, 2012-04-11
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