title: Fluorinated benzalkylsilane molecular rectifiers.
abstract: We report on the synthesis and electrical properties of nine new alkylated silane self-assembled monolayers (SAMs) - (EtO)3Si(CH2)nN = CHPhX where n = 3 or 11 and X = 4-CF3,3,5-CF3, 3-F-4-CF3, 4-F, or 2,3,4,5,6-F, and explore their rectification behavior in relation to their molecular structure. The electrical properties of the films were examined in a metal/insulator/metal configuration, with a highly-doped silicon bottom contact and a eutectic gallium-indium liquid metal (EGaIn) top contact. The junctions exhibit high yields (>90%), a remarkable resistance to bias stress, and current rectification ratios (R) between 20 and 200 depending on the structure, degree of order, and internal dipole of each molecule. We found that the rectification ratio correlates positively with the strength of the molecular dipole moment and it is reduced with increasing molecular length.
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Zachary A
authors.initials: ZA
authors.lastname: Lamport
authors.affiliation: Department of Chemistry, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Angela D
authors.initials: AD
authors.lastname: Broadnax
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: David
authors.initials: D
authors.lastname: Harrison
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Katrina J
authors.initials: KJ
authors.lastname: Barth
authors.affiliation: Department of Chemistry, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Lee
authors.initials: L
authors.lastname: Mendenhall
authors.affiliation: Department of Chemistry, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Clayton T
authors.initials: CT
authors.lastname: Hamilton
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Martin
authors.initials: M
authors.lastname: Guthold
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.|Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
authors.forename: Timo
authors.initials: T
authors.lastname: Thonhauser
authors.affiliation: Department of Chemistry, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Welker
authors.affiliation: Department of Physics, Wake Forest University, Winston Salem, NC 27109, USA.
authors.forename: Oana D
authors.initials: OD
authors.lastname: Jurchescu