Rectifying effect of heterojunction fabricated in freestanding thin film of polyaniline containing azobenzene side-chain

An innovative heterojunction is fabricated between two sides of afreestanding thin film of HCl-doped polyaniline (PANI) derivativecontaining azobenzene side-chain, which is synthesized through anN-alkyl-substituted reaction. Of the film, the side with beingirradiated by UV light during preparation is represented as `Aside'; the other side without being irradiated is represented as`N side'. The electrical properties of the heterojunction aremeasured and the rectifying effect is observed in the{current--voltage} characteristic curves with the values ofrectifying ratio (γ) being 20 at ±0.06 V at T= 77Kand 4 at ±0.02V at T=300 K separately.