Photoinduced charge separation in Q1D heterojunction materials: Evidence   for electron-hole pair separation in mixed-halide $MX$ solids
  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. 
L.A. Worl, S.C. Huckett, B.I. Swanson, A. Saxena, A.R. Bishop, J.   Tinka Gammel