Photoinduced charge separation in Q1D heterojunction materials: Evidence for electron-hole pair separation in mixed-halide MX solids
L. A. Worl, S. C. Huckett, B. I. Swanson, A. Saxena, A. R. Bishop, J. Tinka Gammel
Abstract
Resonance Raman experiments on doped and photoexcited single crystals of mixed-halide MX complexes (M=Pt; X=Cl,Br) clearly indicate charge separation: electron polarons preferentially locate on PtBr segments while hole polarons are trapped within PtCl segments. This polaron selectivity, potentially very useful for device applications, is demonstrated theoretically using a discrete, 3/4-filled, two-band, tight-binding, extended Peierls-Hubbard model. Strong hybridization of the PtCl and PtBr electronic bands is the driving force for separation.
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