Solid-state absorption spectroscopy of alkyl-substituted oligothiophenes

摘要: We have investigated the absorption spectra of thin solid films alkyl-substituted oligothiophenes in both neutral and doped states over a photon energy range 0.05-5.0 eV. In state these oligomers display π-π * transition bands near-UV to visible region with fine structures on low-energy side. found two different oxidized for species; lower is characterized by subgap near-IR that are induced upon doping higher only one band. species, band exhibits increasing intensity side at levels and, finally, maximum shifted highest