  Organic ferroelectric layers sandwiched between the graphene sheets are
presented as a model of the solar cell. The investigated systems display many
advantageous properties: 1) the cascade energy-levels alignment, 2)
simultaneous donor and acceptor character depending on the charge-carrier
direction, 3) the charge-transfer excitonic type, 4) the induced polarization
of the electrodes, leading to a substantial work-function change of the anode
and cathode - around +/-1.5 eV, respectively.
