The effect of interface hopping on inelastic scattering of oppositely charged polarons in polymers |
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Institution: | [1]College of Physics and Hebei Advanced Thin Films Laboratory, Hebei Normal University, Shijiazhuang 050024, China [2]Zhangjiakou Vocational and Technical College, Zhangjiakou 075051, China |
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Abstract: | The inelastic scattering of oppositely charge polarons in polymer heterojunctions is believed to be of fundamental importance for the light-emitting and transport properties of conjugated polymers.Based on the tight-binding SSH model,and by using a nonadiabatic molecular dynamic method,we investigate the effects of interface hopping on inelastic scattering of oppositely charged polarons in a polymer heterojunction.It is found that the scattering processes of the charge and lattice defect depend sensitively on the hopping integrals at the polymer/polymer interface when the interface potential barrier and applied electric field strength are constant.In particular,at an intermediate electric field,when the interface hopping integral of the polymer/polymer heterojunction material is increased beyond a critical value,two polarons can combine to become a lattice deformation in one of the two polymer chains,with the electron and the hole bound together,i.e.,a self-trapped polaron-exciton.The yield of excitons then increases to a peak value.These results show that interface hopping is of fundamental importance and facilitates the formation of polaron-excitons. |
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Keywords: | polarons electron-phonon interactions exciton polymers |
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