NOVELTY - A photovoltaic device comprises subcell(s) between an anode (32) and a cathode (46), and including a charge-transfer dyad (38) with a light absorbing electron donor moiety (40) and an electron acceptor moiety (42) that are covalently linked to each other in a non-flexible configuration and oriented such that each subcell is capable of performing primary photo-induced vectorial electron transfer between donor and acceptor moieties in direction from anode to cathode.    USE - As organic photovoltaic cell, e.g. organic solar cell, for producing electricity from light by converting light energy into electrical energy (claimed).    ADVANTAGE - The structure of the donor-acceptor molecule is highly symmetric, which greatly increases the intramolecular electron transfer and thereby increasing the efficiency of device. The photovoltaic cell having multilayered structure of organic molecules that are oriented by Langmuir-Blodgett technique, creates intramolecular charge transfer with high efficiency to achieve vectorial electron transfer zone as the primary step in the consecutive processes following light absorption, e.g. by a light absorbing layer formed by a conjugated organic polymer. Thus, increasing the efficiency of conversion of light into electricity. The efficiency of photovoltaic devices is improved by incorporating into the devices the charge transfer dyad, in which the primary excited photoactive molecules, containing the electron donating moiety, porphyrin unit, and the electron accepting moiety, the fullerene unit, are oriented anisotropically, by applying the Langmuir-Blodgett technology, in one direction so that the photoinduced electron transfer takes always place from the donor to the acceptor moiety. The light absorbing polymer film increases the absorption of the cell and, thus, utilizes the incident light intensity efficiently.    DETAILED DESCRIPTION - The light absorbing electron donor moiety and the electron acceptor moiety are covalently linked to each other by at least two chemical linkers which are covalently bonded both to the light adsorbing electron donor moiety and to the electron acceptor moiety. The light absorbing electron donor moiety comprises a porphyrin or a phthalocyanine unit. The electron acceptor moiety comprises a fullerene compound or its derivative. The charge-transfer dyads comprise orientated Langmuir-Blodgett films. The photovoltaic device also comprises a light absorbing oligomer or polymer (LAP) layer (36) placed adjacent to the donor moiety of the charge-transfer dyad; a hole transfer layer (HTL) (34) adjacent to the LAP layer, situated between LAP layer and the anode; and an electron transfer layer (ETL) (44) adjacent to the acceptor moiety of the charge-transfer dyad and located between the acceptor moiety and the cathode. The HTL is formed of photoconductive organic semiconducting material. The anode comprises a light transparent conductive oxide.    An INDEPENDENT CLAIM is included for manufacturing the photovoltaic cell.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic representation of a solar cell.    anode (32)    hole transfer layer (34)    light absorbing layer (36)    charge-transfer dyad (38)    light absorbing electron donor moiety (40)    electron acceptor moiety (42)    electron transfer layer (44)    cathode. (46)