Improving Photovoltaic Properties by Incorporating Solution-Processable Functionalized Graphene Into Poly(3-Octylthiophene)/Phenyl c61 Butyric Acid Methyl Ester Photovoltaic Devices
We report the optoelectronic properties occurring in solution-processable functionalized graphene (SPFGraphene)—PCBM/poly(3-octylthiophene) (P3OT) composites. The structural configuration of the devices is ITO/PEDOT:PSS/P3OT:PCBM-SPFGraphene/LiF/Al. The best results were obtained with a P3OT/PCBM (1:1) mixture with 8 wt% of SPFGraphene in an open-circuit voltage (V oc) of 0.65 V, a short-circuit current density (J sc) of 4.2 mA/cm2, and a fill factor (FF) of 0.35, which led to a power conversion efficiency of 0.95% at illumination at 100 mW/cm2 AM 1.5. In the P3OT:PCBM-SPFGraphene composite, the SPFGraphene acted as exciton dissociation sites and provided the transport pathway of the lowest unoccupied molecular orbital (LUMO)-graphene-Al. Doping SPFGraphene into P3OT resulted in appropriate energetic distance between the highest occupied molecular orbital (HOMO) and LUMO of the donor/acceptor for a high open circuit voltage and provided higher exciton dissociation volume mobility of carrier transport for a large short-circuit current density.
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Document Type: Research Article
Publication date: 01 November 2011
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