Patent ID: 8563975

Claim:
A hetero pn junction semiconductor constituted of an electrically conductive polymer as a p-type semiconductor and an inorganic oxide as an n-type semiconductor, which is characterized in that the electrically conductive polymer is filled among nanoparticles of the inorganic oxide so as to satisfy the following Equation 1: Vp/Vn=X×σn/σp (0.1 ≦X≦ 10) <Equation 1> Vp=Volume of the electrically conductive polymer as a p-type semiconductor σp=Electrical conductivity of the electrically conductive polymer as a p-type semiconductor Vn=Volume of the inorganic oxide nanoparticles as an n-type semiconductor σn=Electrical conductivity of the inorganic oxide nanoparticles as an n-type semiconductor.