title: Poly(ethylene imine) impurities induce n-doping reaction in organic (semi)conductors.
abstract: Volatile impurities contained in polyethyleneimine (PEI), and identified as ethyleneimine dimers and trimers, are reported. These N-based molecules show a strong reducing character, as demonstrated by the change in electrical conductivity of organic (semi)conductors exposed to the PEI vapor. The results prove that electron transfer rather than a dipole effect at the electrode interface is the origin of the work-function modification by the PEI-based layers.
authors.affiliation: Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, SE-601 74, Norrköping, Sweden.
authors.forename: Simone
authors.initials: S
authors.lastname: Fabiano
authors.forename: Slawomir
authors.initials: S
authors.lastname: Braun
authors.forename: Xianjie
authors.initials: X
authors.lastname: Liu
authors.forename: Eric
authors.initials: E
authors.lastname: Weverberghs
authors.forename: Pascal
authors.initials: P
authors.lastname: Gerbaux
authors.forename: Mats
authors.initials: M
authors.lastname: Fahlman
authors.forename: Magnus
authors.initials: M
authors.lastname: Berggren
authors.forename: Xavier
authors.initials: X
authors.lastname: Crispin
keywords: amines; charge injection; doping; electron transfer; organic electronics