▎ 摘　　要

NOVELTY - The element has an insulating layer formed on a predetermined domain of a flat-shaped electrode. Another flat-shaped electrode is fixed in the insulating layer along longitudinal direction. The former electrode is made of metal, semiconductor or graphene. The latter electrode is made of nanotube or nanowire. A main body is provided with a ring-shaped, square-shaped, rectangular-shaped or elliptical-shaped cross-section. The nanotube is a carbon nanotube, a metal nanotube or semi-conductive nanotube. The nanowire is a metal nanowire or semiconducting nanowire. USE - Rectifier element i.e. tunnel diode. ADVANTAGE - The electrode is made of nanotube or nanowire so as to increase flow of current and operate the element in a super high frequency band. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for manufacturing a rectifier element. DESCRIPTION OF DRAWING(S) - The drawing shows a perspective view of a rectifier element.