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

doi:10.1088/0953-8984/4/50/012

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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

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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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L. A. Worl, S. C. Huckett, B. I. Swanson, A. Saxena, A. R. Bishop, J. Tinka Gammel. 1992-09-19. Photoinduced charge separation in Q1D heterojunction materials: Evidence for electron-hole pair separation in mixed-halide $MX$ solids. https://doi.org/10.1088/0953-8984%2F4%2F50%2F012

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