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Title: Ultrathin organic solar cells with graphene doped by ferroelectric polarization
Authors: Kim, K.
Bae, S.-H.
Toh, C.T. 
Kim, H.
Cho, J.H.
Whang, D.
Lee, T.-W.
Özyilmaz, B. 
Ahn, J.-H.
Keywords: electrostatic doping
flexible electronics
organic solar cell
transparent electrode
Issue Date: 12-Mar-2014
Citation: Kim, K., Bae, S.-H., Toh, C.T., Kim, H., Cho, J.H., Whang, D., Lee, T.-W., Özyilmaz, B., Ahn, J.-H. (2014-03-12). Ultrathin organic solar cells with graphene doped by ferroelectric polarization. ACS Applied Materials and Interfaces 6 (5) : 3299-3304. ScholarBank@NUS Repository.
Abstract: Graphene has been employed as transparent electrodes in organic solar cells (OSCs) because of its good physical and optical properties. However, the electrical conductivity of graphene films synthesized by chemical vapor deposition (CVD) is still inferior to that of conventional indium tin oxide (ITO) electrodes of comparable transparency, resulting in a lower performance of OSCs. Here, we report an effective method to improve the performance and long-term stability of graphene-based OSCs using electrostatically doped graphene films via a ferroelectric polymer. The sheet resistance of electrostatically doped few layer graphene films was reduced to ∼70 Ω/sq at 87% optical transmittance. Such graphene-based OSCs exhibit an efficiency of 2.07% with a superior stability when compared to chemically doped graphene-based OSCs. Furthermore, OSCs constructed on ultrathin ferroelectric film as a substrate of only a few micrometers show extremely good mechanical flexibility and durability and can be rolled up into a cylinder with 7 mm diameter. © 2014 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
ISSN: 19448252
DOI: 10.1021/am405270y
Appears in Collections:Staff Publications

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