Photoinduced charge separation in Q1D heterojunction materials: evidence for electron-hole pair separation in mixed-halide MX solids
- 14 December 1992
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 4 (50) , 10237-10244
- https://doi.org/10.1088/0953-8984/4/50/012
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.Keywords
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