Continuous, Highly Flexible, and Transparent Graphene Films by Chemical Vapor Deposition for Organic Photovoltaics
KAUST Grant NumberKUS-C1-015-21
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AbstractWe report the implementation of continuous, highly flexible, and transparent graphene films obtained by chemical vapor deposition (CVD) as transparent conductive electrodes (TCE) in organic photovoltaic cells. Graphene films were synthesized by CVD, transferred to transparent substrates, and evaluated in organic solar cell heterojunctions (TCE/poly-3,4- ethylenedioxythiophene:poly styrenesulfonate (PEDOT:PSS)/copper phthalocyanine/fullerene/bathocuproine/aluminum). Key to our success is the continuous nature of the CVD graphene films, which led to minimal surface roughness (∼ 0.9 nm) and offered sheet resistance down to 230 Ω/sq (at 72% transparency), much lower than stacked graphene flakes at similar transparency. In addition, solar cells with CVD graphene and indium tin oxide (ITO) electrodes were fabricated side-by-side on flexible polyethylene terephthalate (PET) substrates and were confirmed to offer comparable performance, with power conversion efficiencies (η) of 1.18 and 1.27%, respectively. Furthermore, CVD graphene solar cells demonstrated outstanding capability to operate under bending conditions up to 138°, whereas the ITO-based devices displayed cracks and irreversible failure under bending of 60°. Our work indicates the great potential of CVD graphene films for flexible photovoltaic applications. © 2010 American Chemical Society.
CitationGomez De Arco L, Zhang Y, Schlenker CW, Ryu K, Thompson ME, et al. (2010) Continuous, Highly Flexible, and Transparent Graphene Films by Chemical Vapor Deposition for Organic Photovoltaics. ACS Nano 4: 2865–2873. Available: http://dx.doi.org/10.1021/nn901587x.
SponsorsThis work was supported by the National Science Foundation under Grant CCF-0702204, by the Center for Advanced Molecular Photovoltaics (CAMP) (KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST), and by Global Photonic Energy Corporation.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
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