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Vinylene-Linked Low-Band-Gap Conducting Polymers: Electronic Structure And Defects
Abstract The band structure and the electrochemical potentials of conductive polymers based on phenyl and thiophene backbone structures can be strongly modified by substituents on the benzene and thiophene rings in poly(p-phenylenes) and polythiophenes, respectively, and by interposing vinylene double bond linkages between rings. Substitution with a methoxy or ethoxy group on the ring further lowers the ionization potentials and band gaps in the vinylene polymers substantially. Excellent agreement is found between band gaps measured by electrochemical spectroscopy (ECPS) and optical absorption spectroscopy. The substituted thienylene vinylene polymers can be described as low-band-gap semiconductors with their absorption edge largely in the near IR. In the heavily doped state, these polymers become “transparent conductors”. A detailed vibrational analysis of PPV yields valuable information about the structural distortion which occur upon doping. The results favor the formation of bipolarons over polarons in PPV and are in good agreement with semiempirical self-consistent (MNDO) defect calculations on large PPV model compounds.
Vinylene-Linked Low-Band-Gap Conducting Polymers: Electronic Structure And Defects
Abstract The band structure and the electrochemical potentials of conductive polymers based on phenyl and thiophene backbone structures can be strongly modified by substituents on the benzene and thiophene rings in poly(p-phenylenes) and polythiophenes, respectively, and by interposing vinylene double bond linkages between rings. Substitution with a methoxy or ethoxy group on the ring further lowers the ionization potentials and band gaps in the vinylene polymers substantially. Excellent agreement is found between band gaps measured by electrochemical spectroscopy (ECPS) and optical absorption spectroscopy. The substituted thienylene vinylene polymers can be described as low-band-gap semiconductors with their absorption edge largely in the near IR. In the heavily doped state, these polymers become “transparent conductors”. A detailed vibrational analysis of PPV yields valuable information about the structural distortion which occur upon doping. The results favor the formation of bipolarons over polarons in PPV and are in good agreement with semiempirical self-consistent (MNDO) defect calculations on large PPV model compounds.
Vinylene-Linked Low-Band-Gap Conducting Polymers: Electronic Structure And Defects
Eckhardt, H. (author) / Jen, K. Y. (author) / Shacklette, L. W. (author) / Lefrant, S. (author)
1990-01-01
16 pages
Article/Chapter (Book)
Electronic Resource
English
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