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RF performance of diamond MISFETs

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7 Author(s)
Umezawa, H. ; CREST, Japan Sci. & Technol. Corp., Tokyo, Japan ; Taniuchi, H. ; Ishizaka, H. ; A-Firna, T.
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A cutoff frequency (fT) of 11 GHz is realized in the hydrogen-terminated surface channel diamond metal-insulator-semiconductor field-effect transistor (MISFET) with 0.7 μm gate length. This value is five times higher than that of 2 μm gate metal-semiconductor (MES) FETs and the maximum value in diamond FETs at present. Utilizing CaF2 as an insulator in the MIS structure, the gate-source capacitance is reduced to half that of the diamond MESFET because of the gate insulator capacitance being in series to the surface-channel capacitance. This FET also exhibits the highest fmax of 18 GHz and 15 dB of power gain at 2 GHz. The high-frequency equivalent circuits of diamond MISFET are deduced from the S-parameters obtained from RF measurement.

Published in:

Electron Device Letters, IEEE  (Volume:23 ,  Issue: 3 )