CHARGE-TRANSFER IN RESTRICTED GEOMETRIES - BINARY APPROXIMATION

We study the time dependence of donor-acceptor forward and back electr on transfer in solids with restricted geometries in binary approximati on. We focus on the time dependence of the donor cation state probabil ity, P(t) within spherical and cylindrical volumes. Deviations from th e known Forster type behavior are observed due to the geometrical rest rictions. The effects of the finite volumes are pronounced when the vo lume dimensions are comparable to the critical radius for charge trans fer. The space restriction slows down the charge separation. The resul ts are good in the limit of low concentrations of accepters.