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We describe a simple method to increase the conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)film by exposure to ultraviolet(UV)light in vacuum.Up to four order of conductivity improvement(from 10 3to 50 S/cm)is achieved by irradiating PEDOT:PSS film with 254 nm ultraviolet(UV)light.Increased conductivity in UV treated PEDOT:PSS film is stable under ambient exposure.The mechanism for conductivity improvement is investigated by current-voltage measurement,atomic force microscopy,and absorption spectrum.Photo-cross-linking of PSS chains is determined as the reason for conductivity improvement.Our result demonstrates that UV treatment is capable of modifying the conductivity of PEDOT:PSS film independent of the process of film formation.
We describe a simple method to increase the conductivity of poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) film by exposure to ultraviolet (UV) light in vacuum. Up to four order of conductivity improvement 3to 50 S / cm) was achieved by irradiating PEDOT: PSS film with 254 nm ultraviolet (UV) light. Creased conductivity in UV treated PEDOT: PSS film is stable under ambient exposure. The mechanism for conductivity improvement is investigated by current-voltage measurement , atomic force microscopy, and absorption spectrum. Photo-cross-linking of PSS chains is determined as the reason for conductivity improvement. Our result demonstrates that UV treatment is capable of modifying the conductivity of PEDOT: PSS film independent of the process of film formation .