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Chemical structure of head-to-tail poly(3-alkylthiophene). : alkyl group, H: head of thiophene monomer, T: tail.
Absorption (solid lines, lower and right axes) and spectra obtained by THG method (filled circles, upper and left axes) for the regio-controlled P3HTs. denotes the ratio of the head-to-tail coupling. The energy positions of the zero-phonon absorption and its phonon sidebands seen for the sample are indicated by vertical solid bars.
(a) versus absorption peak energies . (b) versus .
Densities of the spin-coated films, absorption peak energies , maximum absorption coefficients , peak energies in third-order nonlinear susceptibility spectra and maximum values of with the various head-to-tail coupling ratios .
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