  The geometry-dependent energy transfer rate from an electrically pumped
inorganic semiconductor quantum well into an organic molecular layer is studied
theoretically. We focus on F\"orster-type nonradiative excitation transfer
between the organic and inorganic layer and include quasi-momentum conservation
and intermolecular coupling between the molecules in the organic film.
(Transition) partial charges calculated from density-functional theory are used
to calculate the coupling elements. The partial charges describe the spatial
charge distribution and go beyond the common dipole-dipole interaction. We find
that the transfer rates are highly sensitive to variations in the geometry of
the hybrid inorganic/organic system. For instance, the transfer efficiency is
improved by orders of magnitude by tuning the relative orientation and
positioning of the molecules. Also, the operating regime is identified where
in-scattering dominates over unwanted back-scattering from the molecular layer
into the substrate.
