3-D modelling of a bilayer heterojunction organic solar cell based on copper phthalocyanine and fullerene (CUPC/C 60 ): Evidence of total excitons dissociation at the donor-acceptor interface

A theoretical study of a 3-D modelled bilayer heterojunction organic photovoltaic cell based on copper phthalocyanine (CuPc) as electron donor and fullerene (C60) as electron acceptor is reported. The thin film multilayer stacking theory is applied to the bilayer heterojunction organic solar cell, with the optical matrix of the Abeles theory leading to new expression of generation rate and density of exciton photogenerated in the organic photoactive layer of CuPc/C60. The excitons density is investigated considering the excitons dissociation parameters at the different interfaces of the organic photoactive region, i.e. the exciton dissociation velocities Sdp, Sdg, Sdj and Sdn respectively associated to the transparent anode (ITO: Indium thin oxide)/donor (CuPc), the donor (CuPc)/acceptor (C60) and the acceptor (C60)/metallic cathode (Al: aluminium) interfaces. Moreover, the influences of the monochromatic light wavelength e and the thickness w of the organic photoactive layer (CuPc/C60) on the exciton density are emphasized. KEYWORDS : Bilayer Heterojunction - Organic Solar Cell – Exciton Dissociation