Doped State and Solubility Changes in PEDOT:PSS Thin Films by High‐Energy Gamma‐Ray Irradiation

Abstract

Poly(3,4‐ethylenedioxythiophene):poly(styrenesulphonate) (PEDOT:PSS) thin films with various electrical‐conductivity ranges are irradiated with gamma rays over a wide range of doses (1–50 kGy). Spectroscopic analyses reveal that the high‐energy irradiation results in changes in the doped state and chemical structure of the thin polymer films. Through the absorption measurement of the doped PEDOT:PSS films, the authors find that the films are relatively insensitive to irradiation and that the neutral state peaks in the de‐doped PEDOT decrease relative to the doped state as the gamma‐ray dose increases. The gamma‐ray irradiation up to 50 kGy results in a decrease in electrical conductivity in the already doped polymer films whereas it induces re‐doping and electrical‐conductivity enhancement in the chemically de‐doped ones. The high‐dose irradiation also induces chemical cross‐linking, resulting in thin films that are robust against solvent dipping.

Consequences of gamma-ray irradiation on structural and electronic properties of PEDOT:PSS polymer in air and vacuum environments

“…1 shows the resistivity change as a function of dose at different irradiation environments. It can be noted that the resistivity increases as a function of dose, which is consistent with the work reported by Jang et al and Kane et al 14,16 This phenomenon of decrease in conductivity of the samples at different doses irrespective of the irradiation environments could have resulted due to the defect formation and cross-linking of the polymers. Additional resistivity data of PEDOT:PSS films after irradiation at 500 Gy and 1500 Gy in air and vacuum environments has been shown in Fig.…”

“…High energy ionizing radiation such as proton, 13 gammaray, [14][15][16][17][18][19][20] UV treatment, [21][22][23][24][25] and X-ray 15 has been utilized as an alternative approach for tailoring the structural and electrical conductivities of the lms. Usually, these approaches are temperature independent and in turn results in material with higher purity.…”

Solid-State Organic Electrolyte-Gated Transistors Based on Doping-Controlled Polymer Composites with a Confined Two-Dimensional Channel in Dry Conditions

“…Electron-rich amine compounds, such as hydrazines, amidines, and enamines, have been used to chemically reduce the PEDOT composites and decrease their charge-carrier density. − While dedoping of PEDOT has been used to optimize the performance of various organic electronics and thermoelectric devices, its application in PEDOT-based transistors has not been sufficiently conducted yet. Only few recent studies have applied aliphatic amines for chemical dedoping of PEDOT in OECTs with an aqueous electrolyte .…”

Influence of the volume of EGME-DMSO mixed co-solvent doping on the characteristics of PEDOT:PSS and their application in polymer solar cells

“…Compared to the non-doped sample, the absorption spectra of doped PEDOT:PSS films showed a weak difference at 600–650 nm relating to the neutral state. 24 As known, the addition of dopants into PEDOT:PSS solution has a strong effect on optical properties of thin film obtained, thus, optical band gap values. The optical band gap values for thin films can be calculated from optical absorption data by using of the plot of αhu 2 versus hu.…”