EFFECTS OF SULFIDE TREATMENT ON INP METAL-INSULATOR-SEMICONDUCTOR DEVICES WITH PHOTOCHEMICAL VAPOR DEPOSIT P3N5 GATE INSULATORS

The effects of sulfide treatment on Al-P3N5/InP metal-insulator-semico nductor (MIS) devices with a photochemical vapor deposit P3N5 insulati ng film are investigated. The minimum density of interface trap states is as low as 2.6 x 10(10)/cm(2) . eV, and has been obtained from a sa mple sulfide-treated at 40 degrees C for 20 min. We have successfully fabricated depletion-mode InP metal-insulator-semiconductor field-effe ct transistors (MISFETs) for microwave power device applications. The effective channel electron mobility is observed to be 3100 cm(2)/V . s at 300 K. The extrinsic transconductance of 5.8 mS/mm shows a broad p lateau region over a range of nearly 4 V gate voltage swing.