Abstract
The performances of polymer solar cells( PSCs) depend on processing conditions strongly.In order to increase the crystalline content of polymer and therefore improve the photovoltaic performance of devices,a combinative annealing process featured toluene vapor pretreatment and thermal annealing was introduced to the organic photovoltaic device fabrication,resulting in a high PCE up to 3.25% for P3HT∶ PCBM-based solar cells.The results of XRD and AFM further revealed that the improvement of J SC,V OC and FF were attributed to the improved P3HT crystallinity and chain ordering which facilitated photogenerated exciton dissociation and charge-carrier transport,compared with solvent or thermal annealed samples.
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