title: PbS nanoparticles capped with tetrathiafulvalenetetracarboxylate: utilizing energy level alignment for efficient carrier transport.
abstract: We fabricate a field-effect transistor by covalently functionalizing PbS nanoparticles with tetrathiafulvalenetetracarboxylate. Following experimental results from cyclic voltammetry and ambient-pressure X-ray photoelectron spectroscopy, we postulate a near-resonant alignment of the PbS 1Sh state and the organic HOMO, which is confirmed by atomistic calculations. Considering the large width of interparticle spacing, we observe an abnormally high field-effect hole mobility, which we attribute to the postulated resonance. In contrast to nanoparticle devices coupled through common short-chained ligands, our system maintains a large degree of macroscopic order as revealed by X-ray scattering. This provides a different approach to the design of hybrid organic-inorganic nanomaterials, circumvents the problem of phase segregation, and holds for versatile ways to design ordered, coupled nanoparticle thin films.
authors.affiliation: Material Sciences Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Marcus
authors.initials: M
authors.lastname: Scheele
authors.forename: David
authors.initials: D
authors.lastname: Hanifi
authors.forename: Danylo
authors.initials: D
authors.lastname: Zherebetskyy
authors.forename: Slim T
authors.initials: ST
authors.lastname: Chourou
authors.forename: Stephanus
authors.initials: S
authors.lastname: Axnanda
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Rancatore
authors.forename: Kari
authors.initials: K
authors.lastname: Thorkelsson
authors.forename: Ting
authors.initials: T
authors.lastname: Xu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Liu
authors.forename: Lin-Wang
authors.initials: LW
authors.lastname: Wang
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: A Paul
authors.initials: AP
authors.lastname: Alivisatos