Accurate Method for Obtaining Band Gaps in Conducting Polymers Using a DFT/Hybrid Approach
The Journal of Physical Chemistry A1998Vol. 102(15), pp. 2572–2578
Citations Over TimeTop 10% of 1998 papers
Abstract
DFT calculations on a series of oligomers have been used to estimate band gaps, ionization potentials, electron affinities, and bandwidths for polyacetylene, polythiophene, polypyrrole, polythiazole, and a thiophene−thiazole copolymer. Using a slightly modified hybrid functional, we obtain band gaps within 0.1 eV of experimental solid-state values. Calculated bond lengths and bond angles for the central ring of sexithiophene differ by less than 0.026 Å and 0.7ο from those of the sexithiophene crystal structure. IPs and EAs are overestimated by up to 0.77 eV compared to experimental bulk values. Extrapolated bandwidths agree reasonably well with bandwidths from band structure calculations.
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