title: Improving photovoltaic properties by incorporating solution-processable functionalized graphene into poly(3-octylthiophene)/phenyl c61 butyric acid methyl ester photovoltaic devices.
abstract: 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 SPF-Graphene 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.
authors.affiliation: Key Laboratory of Luminescence and Optical Information, Ministry of Education, Institute of Optoelectronic Technology, Beijing Jiaotong University, Beijing 100044, P. R. China.
authors.forename: Haiteng
authors.initials: H
authors.lastname: Wang
authors.forename: Dawei
authors.initials: D
authors.lastname: He
authors.forename: Yongsheng
authors.initials: Y
authors.lastname: Wang
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Liu
authors.forename: Hongpeng
authors.initials: H
authors.lastname: Wu
authors.forename: Jigang
authors.initials: J
authors.lastname: Wang