Dresden 2014 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Poster: Organic semiconductors and hybrid organic-inorganic heterostructures / Organic photovoltaics

HL 29.1: Poster

Montag, 31. März 2014, 17:00–20:00, P2

Photoemission and photoluminescence spectroscopies of hybrid inorganic-organic heterostructures — •Mariel Grace Dimamay1, 2, Abebe Tarekegne3, Aina Quintilla3, David Talaga4, Jules Oriou2, George Hadziioannou2, Thomas Mayer1, and Wolfram Jaegermann11Materials Science Institute, Technische Universität Darmstadt, Darmstadt, Germany — 2Laboratoire de Chimie des Polymères Organiques, CNRS, Université Bordeaux 1, Pessac, France — 3Light Technology Institute, Karlsruher Institut für Technologie, Karlsruhe, Germany — 4Institut des Sciences Moléculaires, CNRS, Université Bordeaux 1, Talence, France

Organic emitters are in general brighter than their inorganic counterparts, but their low carrier mobility still poses limitations to device efficiency. Several schemes are being developed to circumvent such problem by utilizing inorganic phases for carrier injection and transport. Through subsequent direct charge carrier transfer or Förster energy transfer from the inorganic semiconductor to the organic emitter, followed by a radiative recombination, photons could be emitted efficiently. In this study, two hybrid inorganic-organic material systems, namely, ZnSe - Ir(4-tBupiq)2(acac) and nanocrystalline TiO2 - squaraine-derived dye are investigated. Interface properties and energy level lineups are obtained by measurements involving XPS and UPS on evaporated Ir complex emitter molecules on ZnSe and on drop-casted squaraine-derived dye on TiO2. Photoluminescence of composite films are obtained to show a possible Förster transfer of exciton energy from matrix to emitter dopants.

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