Dr. Silvia Janietz Profile

Dr. Silvia Janietz

at Fraunhofer-IAP

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Publications (6)

Proceedings Article | 8 October 2014 Paper

Concepts for the material development of phosphorescent organic materials processable from solution and their application in OLEDs

S. Janietz, H. Krueger, M. Thesen, B. Salert, A. Wedel

Proceedings Volume 9183, 918303 (2014) https://doi.org/10.1117/12.2061005

KEYWORDS: Polymers, Organic light emitting diodes, Molecules, Electron transport, Glasses, Organic materials, Materials processing, Printing, Electroluminescence, Quantum efficiency

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Proceedings Article | 17 October 2013 Paper

Tailor-made absorber polymers for OPV: from synthesis to formulation development

S. Janietz, Eileen Katholing, A. Lange, W. Schindler

Proceedings Volume 8830, 883019 (2013) https://doi.org/10.1117/12.2021774

KEYWORDS: Particles, Elementary particles, Quantum mechanics, Polarization, Polymers, Relativity, Magnetism, Scattering, Photon polarization, Solar cells

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Organic solar cells are a favorable alternative to their inorganic counterparts because the functional layers of these devices can be processed with printing or coating on a large scale. In this study, a novel absorber polymer was synthesized, blended with fullerene and deposited with inkjet printing for solar cell applications. A fluorene based terpolymer with dialkyl substituted diphenyl-dithienylbenzopyrazine and triphenylamine units was synthesized by Suzuki polymerization with high molecular weights. The introduction of dialkyl substituted diphenyldithienylbenzopyrazine in the fluorene main chain leads to LUMO-energy level of -3.1 eV and to an open circuit voltage of 0.96 V in solar cells. All the requirements were fulfilled to achieve absorber polymers with high efficiencies including a HOMO energy level which is lower than -5.2 eV, a band gap in the range of 1.3-1.9 eV and a hole mobility in OTFTs greater than 1 x 10-3cm2/Vs. Solar cells with printed layers were compared to those with spin coated films in order to evaluate inkjet printing as a thin film deposition method. Efficiency values of 3.7% were found for devices with inkjet printed layers or spin coated layers when using chlorinated solvents. In order to be able to use inkjet printing on a large scale, hazardous, chlorinated solvents should be avoided when depositing the functional materials. Anisol/tetralin was used as an alternative solvent system. It was found that devices prepared from the chlorine-free system showed only slightly lower efficiencies of 2.7% with respect to the chlorinated system. A coarser phase separation was found with energy filtered transmission electron microscopy plasmon mapping which most likely resulted in the performance differences for the chlorinated and chlorine-free solvent systems. This paper, originally published on 17 October 2013, was replaced with the correct version on 30 January 2014. If you downloaded the original PDF but are unable to access the revision, please contact SPIE Digital Library Customer Service for assistance.

Proceedings Article | 3 November 2004 Paper

n-type semiconducting polymers as electron acceptors for organic photovoltaics

Hartmut Krueger, Silvia Janietz, Manuel Thesen, Bert Fischer, Armin Wedel

Proceedings Volume 5520, (2004) https://doi.org/10.1117/12.559666

KEYWORDS: Polymers, Bromine, Polymerization, Photovoltaics, Organic photovoltaics, Fullerenes, Absorption, N-type semiconductors, Semiconductors, Solar energy

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Proceedings Article | 18 October 2004 Paper

Increase the field-effect mobility of regioregular poly(3-hexylthiophene) by introducing fixed acceptor molecules

Silvia Janietz, Dessislava Sainova, Armin Wedel

Proceedings Volume 5522, (2004) https://doi.org/10.1117/12.560345

KEYWORDS: Polymers, Field effect transistors, Molecules, Bromine, Transistors, Dielectrics, Doping, Picosecond phenomena, Modulation, Organic semiconductors

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Proceedings Article | 6 February 2004 Paper

Some new electron-affine polymers for organic photovoltaics

Hartmut Krueger, Silvia Janietz, Dessislava Sainova, Armin Wedel, Bert Fischer

Proceedings Volume 5215, (2004) https://doi.org/10.1117/12.507441

KEYWORDS: Polymers, Absorption, Luminescence, Solar cells, Organic photovoltaics, Glasses, Electrodes, Electron transport, N-type semiconductors, Oxidation

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Proceedings Article | 3 March 2003 Paper

Polyurethanes with covalent attached fluorescent dyes as deep-red-emitting materials

Silvia Janietz, Hartmut Kruger, Armin Wedel, Bert Fischer

Proceedings Volume 4800, (2003) https://doi.org/10.1117/12.453259

KEYWORDS: Polyurethane, Polymers, Organic light emitting diodes, Luminescence, Molecules, Absorption, Electroluminescence, Glasses, Hydrogen, Chromophores

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Showing 5 of 6 publications

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