At the end of 2008, the College of Nanoscale Science and Engineering (CNSE) formally accepted a Vistec VB300
Gaussian electron beam lithography system. The system is a key component of the overall lithography strategy of the
College and complements existing state of the art tooling for 193nm immersion, Extreme Ultra Violet and nanoimprint.
The demonstrated resolving power of the system easily exceeds that of the facility's optical scanners. Together with
300mm wafer compatibility, and a class 1 mini environment, the system is well poised to execute its primary mission of
supporting a variety of programs in post CMOS device integration. For a 300mm tool to be able to exchange wafers
with other tooling in a full flow line it is necessary to pass stringent backside metal contamination testing. TXRF (total
reflection x-ray fluorescence) testing performed with 300mm wafers on the VB300 satisfied the permitted metal
contamination levels and cleared the way for introduction of ebeam patterned wafers into the process flow. Most of the
tooling in the 300mm line handles wafers in front opening universal pods (FOUPS). With the relatively low throughput
of the system (hours per wafer, not wafers per hour), this type of interface is not required. In order to maintain a low
level of defects, 300mm wafers are removed from the FOUPS in the class 1 mini environment and loaded into the
In addition to the 300mm capability, the system supports a wide range of wafer sizes, photomasks and piece parts. This
enables the platform to support the 200mm activities at the College as well as the small samples frequently encountered
with novel materials that have no support tooling available for 200mm and 300mm wafer sizes.
The VB300 platform readily met the Vistec standard acceptance test specifications. The paper presents details of the acceptance test together with examples of additional work in progress that includes implementation of rigorous tool monitor standards, imprint template fabrication and mix and match overlay between the VB300 and optical patterning tools.