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Large area, continuous, few-layered graphene as anodes in organic photovoltaic devices
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Figures

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FIG. 1.

(a) SEM image of graphene film on Si substrate. (Inset: Optical microscopy image of the graphene film on substrate.) (b) HRTEM image of graphene film in low magnification. Inset: Electron diffraction pattern from the unfolded region. (c) Raman spectra of graphene films of different layer thickness. (d) Sheet resistance vs transparency curves of graphene films. (Inset: Optical image of a graphene film on glass with 86% transparency.)

Image of FIG. 2.

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FIG. 2.

(a) Energy diagram of the fabricated device with structure graphene/PEDOT:PSS/P3HT:PCBM/LiF/Al. [(b)–(e)] Current-voltage characteristics of the photovoltaic devices based on graphene films in dark and under illumination, where (b) is from pristine graphene film, (c) graphene film treated by UV light, (d) graphene film modified by PBASE, (e) ITO anode for comparison.

Image of FIG. 3.

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FIG. 3.

Graphene films before and after PBASE modification. (a) Transmittance spectra. Inset: A schematic diagram of the graphene modified by PBASE. (b) Combined UPS and IPES spectra. [(c) and (d)] XPS C and N core-level spectra, respectively.

Tables

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Table I.

Short-circuit current density , open-circuit voltage , FF, and PCE of various photovoltaic devices.

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/content/aip/journal/apl/95/6/10.1063/1.3204698
2009-08-13
2014-04-23

Abstract

Large-area, continuous, transparent, and highly conducting few-layered graphene films produced by chemical vapor deposition method were used as anode for application in photovoltaic devices. The noncovalent modification of the graphene films with pyrene buanoic acid succidymidyl ester improved the power conversion efficiency (PCE) to 1.71%. This performance corresponds to of the PCE of a control device based on indium tin oxide (ITO)/poly(3,4–ethylenedioxythiophene):poly(styrenesulfonate)/poly(3-hexyl)thiophene: phenyl--butyric acid methyl ester/LiF/Al electrodes. This finding paves the way for the substitution of ITO in photovoltaic and electroluminescent devices with low cost graphene films.

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Scitation: Large area, continuous, few-layered graphene as anodes in organic photovoltaic devices
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/6/10.1063/1.3204698
10.1063/1.3204698
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