title: Bipolar redox behaviour, field-effect mobility and transistor switching of the low-molecular azo glass AZOPD.
abstract: We present electrochemical and spectroelectrochemical data for the bipolar azo compound N,N'-diphenyl-N,N'-bis[4-(phenylazo)phenyl]-4,4'diaminobiphenyl (AZOPD) demonstrating reversible bipolar redox behaviour with a bandgap of 2.1 eV. The reduced species formed upon two-electron transfer can be described as bis(radical anion) as was confirmed by comparison with a reference compound with only one azo chromophore. Hole and electron transport behaviour in amorphous films was demonstrated by the fabrication of organic field-effect transistors using gold and magnesium contacts, respectively. The transistors are sensitive to light due to E-Z photoisomerization.
authors.affiliation: Institute of Chemistry and Center for Interdisciplinary Nanostructure Science and Technology, University of Kassel, D-34109 Kassel, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Arlt
authors.forename: Ayna
authors.initials: A
authors.lastname: Scheffler
authors.forename: Irina
authors.initials: I
authors.lastname: Suske
authors.forename: Michael
authors.initials: M
authors.lastname: Eschner
authors.forename: Tobat P I
authors.initials: TP
authors.lastname: Saragi
authors.forename: Josef
authors.initials: J
authors.lastname: Salbeck
authors.forename: Thomas
authors.initials: T
authors.lastname: Fuhrmann-Lieker