Ultrathin organic solar cells with graphene doped by ferroelectric polarization

Keumok Kim, Sang Hoon Bae, Chee Tat Toh, Hobeom Kim, Jeong Ho Cho, Dongmok Whang, Tae Woo Lee, Barbaros Özyilmaz, Jong Hyun Ahn

Research output: Contribution to journalArticle

62 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)3299-3304
Number of pages6
JournalACS Applied Materials and Interfaces
Volume6
Issue number5
DOIs
Publication statusPublished - 2014 Mar 12

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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