Metal-semiconductor barriers which exhibit near ideal forward and reverse I-V characteristics have been fabricated. Typically, for a device with an area of

cm
2made on an n-type, oriented, 0.5 ohm-cm silicon substrate, the forward current at room temperature follows the expression

over eight orders of magnitude in current with

amp and n = 1.01. The breakdown voltage is 50 volts, in excellent agreement with the ideal breakdown voltage of p+n silicon junctions of the same n-type doping. The recovery time measured at 10 ma is less than 0.1 ns, the resolution of the measurement.