title: Solution-processable graphene oxide as an efficient hole transport layer in polymer solar cells.
abstract: The utilization of graphene oxide (GO) thin films as the hole transport and electron blocking layer in organic photovoltaics (OPVs) is demonstrated. The incorporation of GO deposited from neutral solutions between the photoactive poly(3-hexylthiophene) (P3HT):phenyl-C61-butyric acid methyl ester (PCBM) layer and the transparent and conducting indium tin oxide (ITO) leads to a decrease in recombination of electrons and holes and leakage currents. This results in a dramatic increase in the OPV efficiencies to values that are comparable to devices fabricated with PEDOT:PSS as the hole transport layer. Our results indicate that GO could be a simple solution-processable alternative to PEDOT:PSS as the effective hole transport and electron blocking layer in OPV and light-emitting diode devices.
authors.affiliation: Department of Materials Science and Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Shao-Sian
authors.initials: SS
authors.lastname: Li
authors.forename: Kun-Hua
authors.initials: KH
authors.lastname: Tu
authors.forename: Chih-Cheng
authors.initials: CC
authors.lastname: Lin
authors.forename: Chun-Wei
authors.initials: CW
authors.lastname: Chen
authors.forename: Manish
authors.initials: M
authors.lastname: Chhowalla
mesh_terms: D003460:Crystallization / Q000379:methods*; D011211:Electric Power Supplies; D004579:Electron Transport; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D036103:Nanotechnology / Q000295:instrumentation*; D010087:Oxides / Q000737:chemistry; D010316:Particle Size; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D010087:Oxides; D011108:Polymers; D012996:Solutions; D006108:Graphite