Nano Science and Technology Institute
Nanotech 2012 Vol. 1
Nanotech 2012 Vol. 1
Nanotechnology 2012: Advanced Materials, CNTs, Particles, Films and Composites (Volume 1)
Chapter 4: Nanoparticle Synthesis & Applications

Simultaneous removal of nano-sized contaminant particles with multi-modal size distribution using hybrid particle beams

Authors:I. Kim, J.W. Lee
Affilation:POSTECH, KR
Pages:382 - 385
Keywords:CO2, supersonic nozzle, nano-bullet, cleaning efficiency
Abstract:The removal of contaminant particles(CPs) as small as 10nm from wafer surface is essential in successful fabrication of nano-scale devices. The supersonic particle beam technique using nano-sized volatile bullet particles(BPs) was extremely effective in removing CPs in the 10nm size range, but was not very effective for CPs as big as 50-100 nm. In this study, an improved nano particle beam technique was developed, where a mixture of bullet particles of different sizes were used instead of mono-disperse bullet particles. Nano-sized CPs were selectively removed by using bullet particles of two different sizes. Nanometer-sized BPs were generated by gas-phase nucleation and growth in a supersonic nozzle, and different BP sizes were obtained by adjusting the stagnation pressure and nozzle geometric. CO2/He mixture gas was used to generate BPs travelling at supersonic velocities. Cleaning performance was sensitive to the BP size and velocity. Small BPs removed the 10~30nm CPs selectively, and big BPs worked on the CPs 30nm or larger. When two different BPs were used sequentially, we obtained cleaning efficiency about 99% for 10~100nm Al2O3 CPs. This is the first ever report of a successful removal of CPs in the 10nm range with a wide size distribution.
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