Abstract
Adding a revision term H′ to the Baranowski–Büttner–Voit (BBV) model, we investigate the geometrical and electronic structure for an open chain with finite length of an emeraldine-base polymer. The numerical results are very similar to those in the Born–von Karman condition. On this basis, excitons and biexcitons are explored. Our solutions show that the exciton and biexciton in the period-4 EB polymer are not self-trapped like those in the LPPP or PNB, but form discrete polaron pairs and bipolaron pairs, respectively.
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