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Nicolai, H.T. (author), Hof, A. (author), Oosthoek, J.L.M. (author), Blom, P.W.M. (author)The charge transport in blue light-emitting polyspirobifluorene is investigated by both steady-state current-voltage measurements and transient electroluminescence. Both measurement techniques yield consistent results and show that the hole transport is space-charge limited. The electron current is found to be governed by a high intrinsic...article 2011
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Asadi, K. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)Passive or active matrix driving schemes in large displays are prone to high power consumption and cost, respectively. For signage applications such as large out-door displays with low refresh rates there is as yet no technological solution. Here the MEMOLED solution, an organic light-emitting diode with an integrated ferroelectric memory, is...article 2011
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Mergler, Y.L. (author), Rumley-Van Gurp, R. (author), Brasser, P. (author), de Koning, M.C. (author), Goetheer, E.L.V. (author)In this study a systematic approach was chosen to test and characterize amine systems for CO2 capture. Vapour-liquid-equilibrium measurements were performed on a homologue series of amines, with ethylene amine as base structure. Various functional groups were used that ranged in chemical and physical properties. The effect of the addition of the...conference paper 2011
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Asadi, K. (author), Wondergem, H.J. (author), Moghaddam, R.S. (author), McNeill, C.R. (author), Stingelin, N. (author), Noheda, B. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)The operation of resistive switches based on phase-separated blends of organic ferroelectrics and semiconductors depends significantly on the microstructure of such systems. A wide range of analysis techniques are used to characterize spin-coated films of the ferroelectric random copolymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)...article 2011
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Michels, J.J. (author), van Breemen, A.J.J.M. (author), Usman, K. (author), Gelinck, G.H. (author)This article describes a combined experimental and theoretical study on nanophase structure development as a result of liquid phase demixing in solution-cast blends of the organic semiconductor poly(9,9'-dioctyl fluorene) (PFO) and the ferroelectric polymer poly(vinylidene fluoride-co-trifluoroethylene) (P(VDF-TrFE)). Blend layers (200 nm) are...article 2011
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Jarzab, D. (author), Lu, M. (author), Nicolai, H.T. (author), Blom, P.W.M. (author), Loi, M.A. (author)Here we report on a combined photoluminescence and morphological study of a polymer-polymer blend composed of a copolymer of derivatives of polyspirobifluorene and polyfluorene (PBFF) and a derivative of polyphenylene vinylene (MDMO-PPV). Evidence of partial Förster energy transfer from PBFF to MDMO-PPV is revealed by steady-state and time...article 2011
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Galagan, Y.O. (author), de Vries, I.G. (author), Langen, A.P. (author), Andriessen, H.A.J.M. (author), Verhees, W.J.H. (author), Veenstra, S.C. (author), Kroon, J.M. (author)In order to reach the objective of low-cost, large area organic photovoltaic systems, we build up a knowledge base concerning the influence of process conditions on the performance of polymer solar cells. A large area solar cell module, with roll-to-roll coated PEDOT:PSS and photoactive layers (based on P3HT:[C60]PCBM blend) on a flexible...article 2011
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Gholamrezaie, F. (author), Asadi, K. (author), Kicken, R.A.H.J. (author), Langeveld-Voss, B.M.W. (author), de Leeuw, D.M. (author), Blom, P.W.M. (author)We investigate the modulation of the charge injection in organic field-effect transistors with self-assembled monolayers (SAMs) using both a bottom-gate and a top-gate geometry. The current modulation by using SAMs is more pronounced in the top-gate geometry due to the better defined upper surface of the bottom source and drain electrodes. By...article 2011
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Krebs, F.C. (author), Fyenbo, J. (author), Tanenbaum, D.M. (author), Gevorgyan, S.A. (author), Andriessen, H.A.J.M. (author), van Remoortere, B. (author), Galagan, Y.O. (author), Jørgensen, M. (author)Polymer solar cells were prepared in large numbers using roll-to-roll methods and were subsequently integrated into the Organic Electronics Association (OE-A) demonstrator in the year 2011 and presented as a small credit card sized lamp with a flat outline. The lamp comprised the polymer solar cell together with printed circuitry, discrete...article 2011
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Mikhnenko, O.V. (author), Blom, P.W.M. (author), Loi, M.A. (author)We developed a sensitive spectroscopic method to probe triplet concentration in thin films of polyfluorene (PF) at room temperature. The energy of photoexcited triplet excitons is transferred to the guest metal-organic complex, meso-tetratolylporphyrin-Pd (PdTPP), and detected as phosphorescent emission. The phosphorescence intensity of PdTPP-PF...article 2011
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Kuik, M. (author), Nicolai, H.T. (author), Lenes, M. (author), Wetzelaer, G.-J.A.H. (author), Lu, M. (author), Blom, P.W.M. (author)The recombination processes in poly(p -phenylene vinylene) based polymer light-emitting diodes (PLEDs) are investigated. Photogenerated current measurements on PLED device structures reveal that next to the known Langevin recombination also trap-assisted recombination is an important recombination channel in PLEDs, which has not been considered...article 2011
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Boersma, A. (author), Saalmink, M. (author), Lucassen, T. (author), Wiegersma, S. (author), Jansen, T.H. (author), Jansen, R. (author), Cheng, L.K. (author)A distributed chemical sensor is developed by coating multiple Bragg gratings in a single glass fiber with chemical responsive coatings. The composition of the coating is tuned to the target chemicals to be measured and the optical response of the coated grating is optimized by changing the coating thickness. Specific recoaters were used to...conference paper 2011
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Boersma, A. (author), Burghoorn, M.M.A. (author), Saalmink, M. (author)In this paper we present the use of Photonic Crystals as chemical sensors. These 2D nanostructured sensors were prepared by nano-imprint lithography during which a nanostructure is transferred from a nickel template into a responsive polymer, that is be specifically tuned to interact with the chemical compound that must be detected. By creating...conference paper 2011
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Kotlarski, J.D. (author), Moet, D.J.D. (author), Blom, P.W.M. (author)Lowering of the optical band gap of conjugated polymers in bulk heterojunction solar cells not only leads to an increased absorption but also to an increase of the optimal active layer thickness due to interference effects at longer wavelengths. The increased carrier densities due to the enhanced absorption and thicker active layers make low...article 2011
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Knoben, W. (author), Brongersma, S.H. (author), Crego-Calama, M. (author)The refractive index sensitivity of localized surface plasmon resonance sensors can be improved by placing the plasmonic metal particles on pillars instead of on a planar substrate. In this paper, a simple and versatile colloidal lithography method for the fabrication of plasmonic Au islands on top of polymer nanopillars is described. The pillar...article 2011
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Asadi, K. (author), de Bruyn, P. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)We have investigated the efficiency enhancement of organic solar cells upon incorporation of a thin ferroelectric polymer layer. For non-Ohmic contacts the enhancement is due to an increased open circuit voltage, which is, however, independent of the ferroelectric polarization direction. Ferroelectricity cannot play a role due to depolarization...article 2011
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Kuik, M. (author), Wetzelaer, G.-J.A.H. (author), Laddé, J.G. (author), Nicolai, H.T. (author), Wildeman, J. (author), Sweelssen, J. (author), Blom, P.W.M. (author)The effect of on-chain ketone defects on the charge transport of the polyfluorene derivative poly(9,9-dioctylfluorene) (PFO) is investigated. Using MoO3 as ohmic hole contact, the hole transport in a pristine PFO diode is observed to be limited by space-charge, whereas fluorenone contaminated PFO (PFO-F) is shown to be trap limited by the...article 2011
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Tripathi, A.K. (author), van Breemen, A.J.J.M. (author), Shen, J. (author), Gao, Q. (author), Ivan, M.G. (author), Reimann, K. (author), Meinders, E.R. (author), Gelinck, G.H. (author)Multibit memory devices based on the ferroelectric copolymer P(VDF-TrFE) (poly-(vinylidenefluoride-trifluoroethylene)) are presented. Multilevel microstructures are fabricated by thermal imprinting of spin-coated ferroelectric polymer film using a rigid Si template. Multibit storage in capacitors and thin-film transistor memory is realized by...article 2011
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Nicolai, H.T. (author), Hof, A.J. (author), Lu, M. (author), Blom, P.W.M. (author), de Vries, R.J. (author), Coehoorn, R. (author)The charge transport in a polyspirobifluorene derivative with copolymerized N,N,N',N'-tetraaryldiamino biphenyl (TAD) hole transport units is investigated as a function of the TAD content. For TAD concentrations larger than 5, guest-to-guest transport is observed. It is demonstrated that in this regime the charge carrier density dependent...article 2011
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Lu, M. (author), Nicolai, H.T. (author), Wetzelaer, G.-J.A.H. (author), Blom, P.W.M. (author)N-type doping of poly(2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) with decamethylcobaltocene (DMC) strongly improves the electron transport due to filling of the electron traps. Unexpectedly, the n-type doping simultaneously suppresses the hole transport in MEH-PPV. We demonstrate that this strong reduction of the hole...article 2011