Author(s)

V. I. Madogni^1,2*, W. Yang³, B. Kounouhéwa^2,4, M. Agbomahéna⁵, S. A. Hounkpatin^1,2, C. N. Awanou^1,2

¹Ecole Doctorale Sciences des Matériaux (EDSM), Université d’Abomey-Calavi (UAC/FAST), Abomey-Calavi, Bénin.
²Laboratoire de Physique du Rayonnement LPR, FAST-UAC, Cotonou, République du Bénin.
³State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, China.
⁴Centre Béninois de la Recherche Scientifique et Technique (CBRST), Cotonou, République du Bénin.
⁵Laboratoire de Caractérisation Thermophysique des Matériaux et Appropriation Energétique (Labo CTMAE/EPAC/UAC), Abomey-Calavi, Bénin.

In this work, the excitons distribution function in organic bulk hetero junction solar cells, at a depth z has been determined from solving the charge continuity equation, by exploiting the Laplace transform with appropriate boundary conditions. Next, the influence of the electron-hole pair separation distance on the excitons dissociation probability, the internal quantum efficiency and the binding energy, has been studied. The simulated results show that the probability density of the carriers photo generated depends on the generation rate, excitons dissociation and the charge carriers in the cells. The potential improvement of the internal quantum efficiency of charge generation depends on electron-hole pair separation distance, the excitons dissociation probability into free charges and depends strongly on the optical absorption of the photons in the active layer.

Distribution Function, Excitons, Laplace Transform, Internal Quantum Efficiency, Dissociation Probability

Madogni, V. , Yang, W. , Kounouhéwa, B. , Agbomahéna, M. , Hounkpatin, S. and Awanou, C. (2015) Dynamic, Charge Photogeneration and Excitons Distribution Function in Organic Bulk Heterojunction Solar Cells. Open Journal of Applied Sciences, 5, 509-525. doi: 10.4236/ojapps.2015.58050.