Patent ID: 7419849

Claim:
A method for production of a single electron semiconductor element, the semiconductor element comprising a substrate, a source electrode, a drain electrode, and a gate electrode, wherein a quantum dot is positioned between the source electrode and the drain electrode, the substrate has an insulating layer on the top face thereof, the substrate has the source electrode and the drain electrode, which are opposed, on the insulating layer, the source electrode and the drain electrode are provided with a titanium film, and a nontitanium metal film consisting of a metal other than titanium that covers the titanium film, respectively, said method for production comprising: a ferritin dropping step for dropping a solution containing ferritin including a metal or semiconductor particle therein, thereby allowing the ferritin to be selectively arranged between the source electrode and the drain electrode; and a ferritin decomposing step for decomposing the selectively arranged ferritin, thereby forming the quantum dot consisting of the metal or semiconductor particle between the source electrode and the drain electrode.