Fabrication of a transparent conducting electrode based on graphene/silver nanowires via layer-by-layer method for organic photovoltaic devices

B. Tugba Camic, Faruk Oytun, M. Hasan Aslan, Hee Jeong Shin, Hyosung Choi, Fevzihan Basarir

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

A solution-processed transparent conducting electrode was fabricated via layer-by-layer (LBL) deposition of graphene oxide (GO) and silver nanowires (Ag NWs). First, graphite was oxidized with a modified Hummer's method to obtain negatively-charged GO sheets, and Ag NWs were functionalized with cysteamine hydrochloride to acquire positively-charged silver nanowires. Oppositely-charged GO and Ag NWs were then sequentially coated on a 3-aminopropyltriethoxysilane modified glass substrate via LBL deposition, which provided highly controllable thin films in terms of optical transmittance and sheet resistance. Next, the reduction of GO sheets was performed to improve the electrical conductivity of the multilayer films. The resulting GO/Ag NWs multilayer was characterized by a UV–Vis spectrometer, field emission scanning electron microscope (FE-SEM), optical microscope (OM) and sheet resistance using a four-point probe method. The best result was achieved with a 2-bilayer film, resulting in a sheet resistance of 6.5 Ω sq−1 with an optical transmittance of 78.2% at 550 nm, which values are comparable to those of commercial ITO electrodes. The device based on a 2-bilayer hybrid film exhibited the highest device efficiency of 1.30% among the devices with different number of graphene/Ag NW LBL depositions.

Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalJournal of Colloid and Interface Science
Volume505
DOIs
StatePublished - 2017 Nov 1

Keywords

  • Graphene oxide
  • Layer-by-layer deposition
  • Organic photovoltaics
  • Silver nanowire
  • Transparent conducting electrode

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