title: Graphene oxide as a multi-functional p-dopant of transparent single-walled carbon nanotube films for optoelectronic devices.
abstract: Modulation of electronic structures and surface properties of transparent carbon nanotube films is a challenging issue for their application in optoelectronic devices. Here, we report, for the first time, that graphene oxide (GO) nanosheets play the role of a p-doping agent and surface energy modifier of single-walled carbon nanotube (SWCNT)-based transparent conducting electrodes (TCEs). The deposition of highly oxidized, small-sized (i.e., diameter of less than 500 nm) GO nanosheets onto a SWCNT network film reduces the sheet resistance of the pristine film to 60% of its original value by p-doping. The modified TCEs exhibit an outstanding optoelectronic feature of high conductivity with high transparency. Moreover, the wettability of the electrode surface was also noticeably increased, which is advantageous for the solution-based processing of organic electronics. Furthermore, the organic photovoltaic (OPV) cells with the GO-doped SWCNT anodes on flexible substrates were successfully demonstrated. In stark contrast to a power conversion efficiency of 0.44% for pristine SWCNT anodes, GO-doped SWCNT anodes show a drastically enhanced power conversion efficiency of 2.7%.
authors.affiliation: Nano Carbon Materials Research Group, Korea Electrotechnology Research Institute, 70 Boolmosangil, Changwon, Korea 642-120.
authors.forename: Joong Tark
authors.initials: JT
authors.lastname: Han
authors.forename: Jun Suk
authors.initials: JS
authors.lastname: Kim
authors.forename: Sae Byeok
authors.initials: SB
authors.lastname: Jo
authors.forename: Sung Hun
authors.initials: SH
authors.lastname: Kim
authors.forename: Jong Soo
authors.initials: JS
authors.lastname: Kim
authors.forename: Boseok
authors.initials: B
authors.lastname: Kang
authors.forename: Hee Jin
authors.initials: HJ
authors.lastname: Jeong
authors.forename: Seung Yol
authors.initials: SY
authors.lastname: Jeong
authors.forename: Geon-Woong
authors.initials: GW
authors.lastname: Lee
authors.forename: Kilwon
authors.initials: K
authors.lastname: Cho
mesh_terms: D055664:Electrochemical Techniques; D004566:Electrodes; D006108:Graphite / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D055096:Optical Devices; D010087:Oxides / Q000737:chemistry*; D010969:Plastics / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry; D014867:Water / Q000737:chemistry
chemical_list: D037742:Nanotubes, Carbon; D010087:Oxides; D010969:Plastics; D011137:Polystyrenes; D013876:Thiophenes; C533756:poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate); D014867:Water; D006108:Graphite