Posted: May 20, 2009

Proximity Effect Correction software seamlessly integrates with Nanometer Pattern Generation Systems

(Nanowerk News) The newly designed NanoMaker software has been successfully demonstrated at the Nanoscale Integration Laboratory, University of Texas at Dallas. The hardware platform included a Zeiss Supra 40 Field Emission Scanning Electron Microscope (SEM) with a NPGS 9.2 pattern generator.
The experiment consisted of fabricating 20nm and 25nm lines with 50nm and 100nm pitched arrays, respectively, separated by a large solid rectangle in the middle. The HSQ resist thickness on Si was 180nm. Before using the NanoMaker Proximity Effect Correction (PEC) software, many different doses were tried to fabricate the structure correctly without success. Upon using the NanoMaker PEC software, the optimal doses were automatically assigned, the data exported to the NPGS, and the device was successfully fabricated.
>Proximity corrected data of the special test-structure >20nm lines, 180nm thick HSQ resistNanoMaker PEC File
Figure 1 (left). Proximity corrected data of the special test-structure consisting of: 20nm lines with 50nm pitch, upper part; solid rectangle with polygon hole, middle part; 25nm lines with 100nm pitch, lower part. The different colors correspond to different doses due to both Beta-correction and Alpha-correction. Figure 2 (right). SEM micrograph of 20nm lines, 50nm pitch that highlights very stable and dense HSQ structure using the optimal doses provided by the NanoMaker software. HSQ resist thickness is 180nm.
“Usually, it is difficult to fabricate dense nanolines with higher aspect ratios because of the proximity effect,” states Professor Walter Hu, of the Nanoscale Integration Lab at UTD, “The preliminary NanoMaker results that show its ability to get down to uniform 20nm lines in width with 50nm pitch is remarkable.”
Scanning Electron Microscopes are typically limited in acceleration voltage to 30kV. This is where proximity effects are dominant. For organizations that need to create dense nano-patterns with a SEM, the NanoMaker design and PEC software package adds tremendous value to existing NPGS systems.
“We are grateful to Professor Walter Hu and his team for allowing us the opportunity to prove the power of the NanoMaker software,” states Dr. Sergey Zaitsev, CTO of NanoMaker and Head of the Theoretical Department at the Institute of Microelectronics Technology – Russian Academy of Sciences (IMT RAS), “We look forward to a continued partnership with UTD and other research institutes interested in electron/ion beam fabrication of nanodevices and structures using the NanoMaker system.”
Source: SEMTechSolutions
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