Patent ID: 6897604

Claim:
A ballistic-electron generating method comprising: forming a polycrystalline semiconductor film on a semiconductor substrate; applying anodic oxidation under a light irradiating environment where the light reaches to the half depth of the polycrystalline semiconductor film and electrochemical oxidation in a darkroom environment to the semiconductor substrate in order to form a nanostructure microcrystal layer or semi-insulating layer of semiconductor, wherein a first cycle of the anodic oxidation with a first predetermined anodic oxidation current density and first anodic oxidation time and a second cycle of the anodic oxidation with a second predetermined anodic oxidation current density and second anodic oxidation time are alternately repeated a predetermined number of times and the electrochemical oxidation is applied after the predetermined number of times of alternate repetition of the anodic oxidation; and applying an electric field to the nanostructure microcrystal layer or semi-insulating layer in order to cause a multiple-tunnel effect, thereby generating ballistic electrons or quasiballistic electrons.