Performance of Co-Donor Photovoltaic Devices Based on Graphene-Accceptor System

Ji Gang Wang; Yong Sheng Wang; Da Wei He; Hong Peng Wu; Hai Teng Wang; Pan Zhou; Yong Na Zhang; Ming Fu

doi:10.4028/www.scientific.net/AMR.396-398.2471

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 396-398Performance of Co-Donor Photovoltaic Devices Based...

Performance of Co-Donor Photovoltaic Devices Based on Graphene-Accceptor System

Abstract:

The poly (2-methoxy-5-(2-ethylhexyl oxy)-1, 4-phenylenevin- ylene) (MEH-PPV) was used as a secondary electron donor material in the poly (3-octylthiophene) (P3OT): graphene bulk-heterojunction photovoltaic cell. The XRD investigation of the active layer showed a well-organized intraplane structure with lamellae oriented normal to the substrate. The mechanism of charge transfer in the multi-donor PV cell was investigated; it shows that efficient energy transfer takes place from MEH-PPV to P3OT. The reason for the increase in the open-circuit voltage which dues to the band structure of BHJ where the energy level change of the highest occupied molecular orbital of the MEH-PPV: P3OT as multi-donor. The hybrid devices showed the energy conversion efficiency of the multi-donor BHJ solar devices with moderate amount of MEH-PPV. The surface roughness investigation indicated the morphology of the hybrid active layer film.