title: Localized photovoltaic investigations on organic semiconductors and bulk heterojunction solar cells.
abstract: Newly synthesized organic electronics materials are often available in submicrogram amounts only. Photoelectrochemical scanning droplet cell microscopy is a powerful method that allows a comprehensive characterisation of such small amounts including oxidation, reduction potentials, doping, determination of charge carriers, band gap, charge capacity, over-oxidation sensitivity and many more. Localized photoelectrochemical characterization of the poly[4,8-bis-substituted-benzo[1,2-b:4,5-b0]dithiophene-2,6-diyl-alt-4-substituted-thieno [3,4-b] thiophene-2,6-diyl] (PBDTTT-c) and PBDTTT-c:PCBM bulk heterojunction was performed using photoelectrochemical scanning droplet cell microscopy (PE-SDCM). The optical properties and the real and imaginary part of the dielectric function, of the polymer were determined using spectroscopic ellipsometry. The photoelectrochemical characterizations were performed in a three and two electrode configuration of PE-SDCM under laser and white light illumination. The effect of illumination was characterized using dark/illumination sequences. The stability of the photocurrent was studied using longer term (600 s) illumination. Finally the effect of cell configuration and illumination conditions on the photovoltage was studied.
authors.affiliation: Institute for Chemical Technologies of Inorganic Materials, Johannes Kepler University of Linz, Austria.
authors.forename: Jan Philipp
authors.initials: JP
authors.lastname: Kollender
authors.affiliation: Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University of Linz, Austria.
authors.forename: Jacek
authors.initials: J
authors.lastname: Gasiorowski
authors.affiliation: Linz Institute for Organic Solar Cells (LIOS), Physical Chemistry, Johannes Kepler University of Linz, Austria.
authors.forename: Niyazi Serdar
authors.initials: NS
authors.lastname: Sariciftci
authors.affiliation: Institute for Chemical Technologies of Inorganic Materials, Johannes Kepler University of Linz, Austria.
authors.forename: Andrei Ionut
authors.initials: AI
authors.lastname: Mardare
authors.affiliation: Institute for Chemical Technologies of Inorganic Materials, Johannes Kepler University of Linz, Austria; Christian Doppler Laboratory for Combinatorial Oxide Chemistry (COMBOX) at the Institute for Chemical Technologies of Inorganic Materials, Johannes Kepler University of Linz, Austria.
authors.forename: Achim Walter
authors.initials: AW
authors.lastname: Hassel
keywords: bulk heterojunction; organic semiconductor; photoelectrochemistry; scanning droplet cell microscopy