In order to fabricate high performance polymer solar cells, donor:acceptor mixture must be prepared using a proper solvent. Since selection of the solvent is the key for obtaining good morphology of the films as well as the efficiency and stability of the photovoltaic devices, finding a suitable solvent could considerably enhance the Poly(3-hexylthiophene) (P3HT):C60 based cell performance in terms of short circuit current (JSC), fill factor (FF) and finally power conversion efficiency (PCE).

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... e formation of C60 aggregates and donor material, i.e. Poly(3-hexylthiophene), crystallinity depend on the selection of proper solvent. In this paper, photovoltaic (PV) solar cells have been fabricated using tree solvents: chloroform (CHCl3), chlorobenzene (CB) and 1-Chloronaphthalene (Cl-Naph). The active layers were composed of poly(3-hexyl)thiophene (P3HT) as a donor and (C60) as an acceptor. P3HT:C60 films casted from 1-Chloronaphthalene solution absorb more red light than the films casted from other solution.. On the other hand the donor/acceptor composition ratio were Investigated and reported.