M. Koyanagi, Y. Yamada, M. Park, T. Fukushima, T. Tanaka
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Research and development of transistor structure in nano-scale region
In this work, new silicon-on-low-k substrate (SOLK) MOSFET and germanium-on-low-k substrate (GOLK) MISFET are proposed. SOLK-MOSFET with metal back-gate was successfully fabricated using wafer bonding method with low-k material as an adhesive. It was shown that the threshold voltage, the on-current, and the off-current are more effectively controlled by the back-gate bias voltage in SOLK-MOSFETs with metal back-gate than in SOI-MOSFETs with buried back-gate. Ge MISFETs were fabricated with HfO2 gate dielectric and W/W2N metal gate which are formed on GOI wafer obtained by a new graded Ge condensation method. Excellent drain current-voltage characteristics and subthreshold characteristics in are obtained in the fabricated GOI-MISFETs.
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