Exciton Bimolecular Annihilation Dynamics in Push-Pull Semiconductor Polymers.

Meanwhile, the annihilation rates extracted from TA also show a decreasing trend with excitation density even with overall higher β values, as shown in Figure 4 c.

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Previously, the Franck–Condon analysis performed on the absorption line shape of the same samples prepared from a variety of precursor-solution concentrations revealed an increasing trend of chain backbone order with the viscosity of the precursor solution. 9 In this Letter, we report that thin films prepared from higher precursor-solution concentrations show higher annihilation rates, likely due to short-range Coulombic interactions and/or wave function overlap enhanced by the chain planarization identified previously.

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