TY - JOUR
T1 - Organic photovoltaic devices based on an acceptor of solution-processable functionalized graphene
AU - Wang, Jigang
AU - Wang, Yongsheng
AU - He, Dawei
AU - Wu, Hongpeng
AU - Wang, Haiteng
AU - Zhou, Pan
AU - Fu, Ming
AU - Jiang, Ke
AU - Chen, Wei
PY - 2011
Y1 - 2011
N2 - We prepared the exfoliation of graphite, which was necessary for the production of graphene sheets that are desirable for the fabrication of nano-composites. Then a Solution-Processable Functionalized Graphene (SPFGraphene) with functionalization groups doped with P3HT hybrid thin film-based organic photovoltaic cells (OPVCs) was systematically identified using a general device structure of, ITO/PEDOT:PSS/P3HT:SPFGraphene/LiF/Al. The effect of annealing on the photoelectric properties of the SPFGraphene was analyzed by Fourier transform infrared FT-IR spectroscopy and solar cell performance. After treatment at different annealing temperatures, with an increase in the SPFGraphene content, the short-circuit current density J sc and power conversion efficiency PCE of the hybrid devices increased first, reaching the peak efficiency for the 10 wt% SPFGraphene content, and then decreased. After annealing at 160 °C, the device containing 10 wt% SPFGraphene showed the open-circuit voltage Voc of 0.73 V, the J sc value of 3.98 mA cm ?2, fill factor (FF) value of 0.36, the PCE value of 1.046%. After thermal annealing at 210 °C, with the removal of the functional groups and recovery of the φ-conjugated areas, the conductivity of the graphene sheet and the charge carrier-transport mobility increased greatly, the Jsc value of the 10 wt% SPFGraphene content device increased to 4.2 mA cm ?2, the Voc value decreased to 0.59 V, which may be attributed to the altered work-function value of the functionalized graphene and low quasi-Fermi levels for electrons and holes, the FF value was 0.27, and the PCE was 0.669%, which is lower than the former one. The results indicated that annealing at the appropriate temperature can improve the device performance greatly, and the functionalized graphene is expected to be a competitive candidate in organic photovoltaic applications because it is soluble, cheap, easily prepared, stable, and inert against the ambient conditions.
AB - We prepared the exfoliation of graphite, which was necessary for the production of graphene sheets that are desirable for the fabrication of nano-composites. Then a Solution-Processable Functionalized Graphene (SPFGraphene) with functionalization groups doped with P3HT hybrid thin film-based organic photovoltaic cells (OPVCs) was systematically identified using a general device structure of, ITO/PEDOT:PSS/P3HT:SPFGraphene/LiF/Al. The effect of annealing on the photoelectric properties of the SPFGraphene was analyzed by Fourier transform infrared FT-IR spectroscopy and solar cell performance. After treatment at different annealing temperatures, with an increase in the SPFGraphene content, the short-circuit current density J sc and power conversion efficiency PCE of the hybrid devices increased first, reaching the peak efficiency for the 10 wt% SPFGraphene content, and then decreased. After annealing at 160 °C, the device containing 10 wt% SPFGraphene showed the open-circuit voltage Voc of 0.73 V, the J sc value of 3.98 mA cm ?2, fill factor (FF) value of 0.36, the PCE value of 1.046%. After thermal annealing at 210 °C, with the removal of the functional groups and recovery of the φ-conjugated areas, the conductivity of the graphene sheet and the charge carrier-transport mobility increased greatly, the Jsc value of the 10 wt% SPFGraphene content device increased to 4.2 mA cm ?2, the Voc value decreased to 0.59 V, which may be attributed to the altered work-function value of the functionalized graphene and low quasi-Fermi levels for electrons and holes, the FF value was 0.27, and the PCE was 0.669%, which is lower than the former one. The results indicated that annealing at the appropriate temperature can improve the device performance greatly, and the functionalized graphene is expected to be a competitive candidate in organic photovoltaic applications because it is soluble, cheap, easily prepared, stable, and inert against the ambient conditions.
KW - Annealing
KW - Conductivity
KW - Graphene
KW - Work Function
UR - http://www.scopus.com/inward/record.url?scp=84863171727&partnerID=8YFLogxK
U2 - 10.1166/jnn.2011.5214
DO - 10.1166/jnn.2011.5214
M3 - Article
AN - SCOPUS:84863171727
SN - 1533-4880
VL - 11
SP - 9432
EP - 9438
JO - Journal of Nanoscience and Nanotechnology
JF - Journal of Nanoscience and Nanotechnology
IS - 11
ER -
