title: Graphene Ink as a Conductive Templating Interlayer for Enhanced Charge Transport of C60-Based Devices.
abstract: We demonstrate conductive templating interlayers of graphene ink, integrating the electronic and chemical properties of graphene in a solution-based process relevant for scalable manufacturing. Thin films of graphene ink are coated onto ITO, following thermal annealing, to form a percolating network used as interlayer. We employ a benchmark n-type semiconductor, C60, to study the interface of the active layer/interlayer. On bare ITO, C60molecules form films of homogeneously distributed grains; with a graphene interlayer, a preferential orientation of C60molecules is observed in the individual graphene plates. This leads to crystal growth favoring enhanced charge transport. We fabricate devices to characterize the electron injection and the effect of graphene on the device performance. We observe a significant increase in the current density with the interlayer. Current densities as high as ∼1 mA/cm2and ∼70 mA/cm2are realized for C60deposited with the substrate at 25 °C and 150 °C, respectively.
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: D Leonardo
authors.initials: DL
authors.lastname: Gonzalez Arellano
authors.affiliation: Department of Physics, Kangwon National University , 1 Gangwondaehak-gil, 24341, Republic of Korea.
authors.forename: Hyunbok
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Materials Science and Engineering and Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
authors.forename: Ethan B
authors.initials: EB
authors.lastname: Secor
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Edmund K
authors.initials: EK
authors.lastname: Burnett
authors.affiliation: Department of Materials Science and Engineering and Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: James J
authors.initials: JJ
authors.lastname: Watkins
authors.affiliation: Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.
authors.forename: Alejandro L
authors.initials: AL
authors.lastname: Briseno
keywords: C60; crystallization; graphene; solution-processed; templating-interlayer