title: Graphene cathode-based ZnO nanowire hybrid solar cells.
abstract: Growth of semiconducting nanostructures on graphene would open up opportunities for the development of flexible optoelectronic devices, but challenges remain in preserving the structural and electrical properties of graphene during this process. We demonstrate growth of highly uniform and well-aligned ZnO nanowire arrays on graphene by modifying the graphene surface with conductive polymer interlayers. On the basis of this structure, we then demonstrate graphene cathode-based hybrid solar cells using two different photoactive materials, PbS quantum dots and the conjugated polymer P3HT, with AM 1.5G power conversion efficiencies of 4.2% and 0.5%, respectively, approaching the performance of ITO-based devices with similar architectures. Our method preserves beneficial properties of graphene and demonstrates that it can serve as a viable replacement for ITO in various photovoltaic device configurations.
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
authors.forename: Hyesung
authors.initials: H
authors.lastname: Park
authors.forename: Sehoon
authors.initials: S
authors.lastname: Chang
authors.forename: Joel
authors.initials: J
authors.lastname: Jean
authors.forename: Jayce J
authors.initials: JJ
authors.lastname: Cheng
authors.forename: Paulo T
authors.initials: PT
authors.lastname: Araujo
authors.forename: Mingsheng
authors.initials: M
authors.lastname: Wang
authors.forename: Moungi G
authors.initials: MG
authors.lastname: Bawendi
authors.forename: Mildred S
authors.initials: MS
authors.lastname: Dresselhaus
authors.forename: Vladimir
authors.initials: V
authors.lastname: Bulović
authors.forename: Jing
authors.initials: J
authors.lastname: Kong
authors.forename: Silvija
authors.initials: S
authors.lastname: Gradečak