Low on-resistance diamond field effect transistor with high-k ZrO(2) as dielectric

Although several high-k insulators have been deposited on the diamond for metal-insulator-semiconductor field effect transistors (MISFETs) fabrication, the k values and current output are still not fully satisfactory. Here, we present a high-k ZrO(2) layer on the diamond for the MISFETs. The k value for ZrO(2) is determined by capacitance-voltage characteristic to be 15.4. The leakage current density is smaller than 4.8 × 10(−5) A·cm(−2) for the gate voltage ranging from −4.0 to 2.0 V. The low on-resistance MISFET is obtained by eliminating source/drain-channel interspaces, which shows a large current output and a high extrinsic transconductance. The high-performance diamond MISFET fabrication will push forward the development of power devices.