  The radiative recombination of electron-hole pairs represents a great
challenge to the photon-to-charge efficiency in the photocell. In this paper,
we investigate how to suppress radiative recombination rate (RRR) in a proposed
quantum photocell with three dipole-dipole coupled and uncoupled electron
donors. The results showed that the RRR could be suppressed in this photocell
with three uncoupled electron donors but be enhanced with three dipole-dipole
coupled electron donors by the ambient circumstance temperatures, and the
increasing energy gap in the donors, the decreasing gap between the donors and
acceptor inhabited the RRR with three dipole-dipole both coupled and uncoupled
electron donors. When the photocell was manipulated by the electrostatic
dipole-dipole coupling strength J at room temperature, the RRR was suppressed
to a smaller minimum by the gap between the donors and acceptor than those by
different gaps in the donors. These suppressed strategies for RRR point out
some significant ways to increase the photon-to-charge efficiency and deserve
the further experimental verification.
