NIST logo

Publication Citation: Enhanced Spatial Resolution Electrical Scanning Probe Microscopy By Using Carbon Nanotube Terminated Tips

NIST Authors in Bold

Author(s): Joseph J. Kopanski; Ilona Sitnitsky; Victor H. Vartanian; Paul McClure; Vladimir Mancevski;
Title: Enhanced Spatial Resolution Electrical Scanning Probe Microscopy By Using Carbon Nanotube Terminated Tips
Published: November 18, 2011
Abstract: Electrical scanning probe microscopes, such as the scanning capacitance microscope (SCM) for two dimensional dopant profiling, scanning Kelvin force microscope (SKFM) for surface potential measurements, and the tunneling atomic force microscope (TUNA) for dielectric integrity measurements, are important tools for the characterization of CMOS and nanoelectronic devices. A significant limitation of all these techniques is the stray capacitance from the shank of the tip and cantilever, which causes signal averaging over an area much wider than expected from the terminal tip dimensions. We have used conventional SPM tips terminated with a welded carbon nanotube (CNT) to overcome this limitation. We have examined with SCM and SKFM, using both conventional and CNT terminated tips, ultra-shallow junctions, high-κ gate stacks, low-κ intermetal dielectrics, and FINFET devices in cross-section. We have also measured the electrical properties of the CNT terminated tips. Substantial improvement in the spatial resolution was observed with the CNT terminated tips as compared to the conventional tips, but additional artifacts could also be introduced by the CNT tips. CNT terminated tips provided enhanced spatial resolution when used for electrical characterization measurements useful for nanoelectronics.
Conference: 2011 International Conference on Frontiers of Characterization and Metrology for Nanoelectronics
Proceedings: AIP Conference Proceedings: 2011 International Conference on Frontiers of Characterization and Metrology for Nanoelectronics
Volume: 1395
Pages: pp. 123 - 127
Location: Grenoble, -1
Dates: May 24-26, 2011
Keywords: FINFET, carbon nanotube, scanning capacitance microscope, scanning Kelvin force microscope, scanning probe microscope
Research Areas: Analysis Tools and Techniques, Device Design and Characterization, Process Metrology