title: Photoemission Studies on N-Substituted Dithienylated Phenothiazines.
abstract: Dithienylated phenothiazines (DTPTs) with different functional groups attached to the central nitrogen atom are presented as a class of versatile metal-free chromophores for the design of dye-sensitized solar cells (DSSCs) and organic light-emitting diodes (OLEDs). The electronic characteristics of spin-coated thin films on polycrystalline gold were studied using photoelectron spectroscopy assisted by theoretical calculations, scanning force microscopy, and UV/Vis spectroscopy. Complementary fluorescence spectra show light emission in the blue region (465 nm). The absorption properties and good hole-transporting abilities make DTPTs feasible hole-transporting materials (HTM) and metal-free chromophores in UV-sensitive solar cell designs.
authors.affiliation: University of Kaiserslautern, Department of Physics and Research Center OPTIMAS, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern (Germany).
authors.forename: Mathias
authors.initials: M
authors.lastname: Fingerle
authors.affiliation: University of Kaiserslautern, Department of Chemistry, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern (Germany).
authors.forename: Maximilian
authors.initials: M
authors.lastname: Hemgesberg
authors.affiliation: University of Kaiserslautern, Department of Chemistry, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern (Germany).
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Schmitt
authors.affiliation: University of Kaiserslautern, Department of Physics and Research Center OPTIMAS, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern (Germany).
authors.forename: Stefan
authors.initials: S
authors.lastname: Lach
authors.affiliation: University of Kaiserslautern, Department of Chemistry, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern (Germany).
authors.forename: Markus
authors.initials: M
authors.lastname: Gerhards
authors.affiliation: University of Kaiserslautern, Department of Chemistry, Erwin-Schrödinger-Str. 52-54, 67663 Kaiserslautern (Germany).
authors.forename: Werner R
authors.initials: WR
authors.lastname: Thiel
authors.affiliation: University of Kaiserslautern, Department of Physics and Research Center OPTIMAS, Erwin-Schrödinger-Str. 56, 67663 Kaiserslautern (Germany). cz@physik.uni-kl.de.
authors.forename: Christiane
authors.initials: C
authors.lastname: Ziegler
keywords: UV/Vis spectroscopy; dye-sensitized solar cells; organic electronics; phenothiazines; photoelectron spectroscopy