title: Reduction of charge recombination by an amorphous titanium oxide interlayer in layered graphene/quantum dots photochemical cells.
abstract: The effect of an amorphous TiO(x) interlayer on layered graphene/quantum dots photochemical cells has been investigated. The addition of the TiO(x) interlayer eliminates the decay of photocurrent in the initial seconds after light illumination and significantly increases the slope of the steady-state photocurrent versus the light intensity. The open-circuit voltage decay measurements further illustrate a longer electron lifetime when an amorphous TiO(x) interlayer is applied. Consequently, the photocurrent and photovoltage of the photovoltaic cell with a TiO(x) interlayer are greatly increased. This work demonstrates that the graphene/amorphous TiO(x) composite structure effectively inhibits charge recombination while enhancing charge transfer, providing a promising scaffold for quantum dots and dye-sensitized photovoltaic cells.
authors.affiliation: School of Chemical and Biomedical and Center for Advanced Bionanosystems, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457, Singapore.
authors.forename: HongBin
authors.initials: H
authors.lastname: Yang
authors.forename: ChunXian
authors.initials: C
authors.lastname: Guo
authors.forename: Guan Hong
authors.initials: GH
authors.lastname: Guai
authors.forename: QuanLiang
authors.initials: Q
authors.lastname: Song
authors.forename: San Ping
authors.initials: SP
authors.lastname: Jiang
authors.forename: Chang Ming
authors.initials: CM
authors.lastname: Li
mesh_terms: D006108:Graphite / Q000737:chemistry*; D018625:Microscopy, Atomic Force; D010777:Photochemistry / Q000379:methods*; D045663:Quantum Dots; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D006108:Graphite; D014025:Titanium