Inverted Polymer Solar Cells with a Reduced Graphene Oxide/Poly (3,4-Ethylene Dioxythiophene):Poly(4-Styrene Sulfonate) (PEDOT:PSS) Hole Transport Layer
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In this study, high-efficiency inverted polymer solar cells were developed by using graphene oxide/poly(3,4-ethylene-dioxythiophene):poly(4-styrene-sulfonate) (GO/PEDOT:PSS) composites films acting as hole transport layer into the device structure based on Indium Tin Oxide (ITO)/Zinc Oxide (ZnO)/Poly(3-hexylthiophene):[6,6]phenyl-C61-butyric Acid Methyl Ester (P3HT:PCBM)/GO:PEDOT:PSS/Silver (Ag). The electrical conductivity and Seebeck coefficient of the films have been measured at room temperature and a maximum of conductivity achieved was for 492 S/cm for a 3 wt.% GO/PEDOT:PSS film treated with dimethyl sulfoxide as solvent and a decrease in the conductivity was observed for higher content of GO even after chemical or thermal reduction. The energy conversion efficiency was enhanced from 2.14% to 3.06% by incorporating 3 wt.% of GO into the PEDOT:PSS buffer layer. Thus, the 3 wt.% GO/PEDOT:PSS is a promising buffer layer for photovoltaic and electronic applications, since a decrease of the overall performance of the photovoltaic device was observed for higher concentration of GO.
KeywordsGraphene buffer layer electrical conductivity energy conversion efficiency organic photovoltaic device inverted polymer solar cells
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- 31.A.A. Dubinov, V.Y. Aleshkin, V. Mitin, T. Otsuji, and V. Ryzhii, J. Phys.: Condens. Matter 23, 1 (2011).Google Scholar