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Early predictions that diamond would be a suitable material for high-performance high-power devices were not supported by the characteristics of diodes and field effect transistors (FETs) fabricated on boron doped (p-type) thin-film material. In this paper commercially accessible polycrystalline thin-film diamond has been turned p-type by the incorporation of near-surface hydrogen, a type of film often referred to as `surface conducting'. Schottky diodes and metal-semiconductor FETs (MESFETs) have been fabricated using this approach which display unprecedented performance levels; diodes with a rectification ratio >106, leakage currents |
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