Searched for: author%3A%22Blom%2C+P.W.M.%22
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Zhao, D. (author), Lenz, T. (author), Katsouras, I. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
In this work, the macroscopic polarization of a ferroelectric capacitor is correlated with the local domain morphology. To this end, a ferroelectric capacitor of the random copolymer poly(vinylidenefluoride-trifluoroethylene) [P(VDF-TrFE)] is poled to a set polarization state in a Sawyer-Tower setup. After chemically removing the top electrode,...
article 2017
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Oostra, A.J. (author), Reddy, A. (author), Smits, E.C.P. (author), Abbel, R.J. (author), Groen, W.A. (author), Blom, P.W.M. (author), Michels, J.J. (author)
A method is presented to self-repair cracks in embedded silver grid structures used in large area organic electronics. The repair procedure is based on electro-deposition, incited by the application of a moderate DC voltage across the crack. During this process the organic anode that is in direct electrical contact with the silver grid,...
article 2016
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Lenz, T. (author), Sharifi Dehsari, H. (author), Asadi, K. (author), Blom, P.W.M. (author), Groen, W.A. (author), de Leeuw, D.M. (author)
We demonstrate that ferroelectric memory diodes can be utilized as switching type positive temperature coefficient (PTC) thermistors. The diode consists of a phase separated blend of a ferroelectric and a semiconducting polymer stacked between two electrodes. The current through the semiconducting polymer depends on the ferroelectric...
article 2016
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van der Kaap, N.J. (author), Katsouras, I. (author), Asadi, K. (author), Blom, P.W.M. (author), Koster, L.J.A. (author), de Leeuw, D.M. (author)
The current density-voltage (J-V) characteristics of hole-only diodes based on poly(2-methoxy, 5-(2′ ethyl-hexyloxy)-p-phenylene vinylene) (MEH-PPV) were measured at a wide temperature and field range. At high electric fields the temperature dependence of the transport vanishes, and all J-V sweeps converge to a power law. Nuclear tunneling...
article 2016
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Zhao, D. (author), Katsouras, I. (author), Asadi, K. (author), Groen, W.A. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
A homogeneous ferroelectric single crystal exhibits only two remanent polarization states that are stable over time, whereas intermediate, or unsaturated, polarization states are thermodynamically instable. Commonly used ferroelectric materials however, are inhomogeneous polycrystalline thin films or ceramics. To investigate the stability of...
article 2016
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Oostra, A.J. (author), Smits, E.C.P. (author), de Leeuw, D.M. (author), Blom, P.W.M. (author), Michels, J.J. (author)
The operational characteristics of organic solar cells manufactured with large area processing methods suffers from the occurrence of short-circuits due to defects in the photoactive thin film stack. In this work we study the effect of a shunt resistance on an organic solar cell and demonstrate that device performance is not affected negatively...
article 2015
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Katsouras, I. (author), Zhao, D. (author), Spijkman, M.J. (author), Li, M. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author), Asadi, K. (author)
The on/off current ratio in organic ferroelectric field-effect transistors (FeFETs) is largely determined by the position of the threshold voltage, the value of which can show large device-to-device variations. Here we show that by employing a dual-gate layout for the FeFET, we can gain full control over the on/off ratio. In the resulting dual...
article 2015
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Oostra, A.J. (author), Blom, P.W.M. (author), Michels, J.J. (author)
Defects occurring during printing of the photoactive layer in organic solar cells lead to short-circuits due to direct contact between the PEDOT:PSS anode and metallic cathode. We provide a highly effective repair method where the defected zone with bare PEDOT:PSS is treated with aqueous sodium hypochlorite to locally disrupt the conductivity of...
article 2015
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Lenz, T. (author), Zhao, D. (author), Richardson, G. (author), Katsouras, I. (author), Asadi, K. (author), Glasser, G. (author), Zimmermann, S.T. (author), Stingelin, N. (author), Roelofs, W.S.C. (author), Kemerink, M. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
Ferroelectric nanostructures offer a promising route for novel integrated electronic devices such as non-volatile memories. Here we present a facile fabrication route for ferroelectric capacitors comprising a linear array of the ferroelectric random copolymer of vinylidenefluoride and trifluoroethylene (P(VDFTrFE)) interdigitated with the...
article 2015
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Zhao, D. (author), Katsouras, I. (author), Asadi, K. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
Switching, i.e., polarization reversal, of ferroelectric P(VDF-TrFE) thin films has been investigated in a wide range of applied electric field and temperature. The measured polarization transients can be quantitatively described by a compressed exponential function as originally formulated by Kolmogorov, Avrami, and Ishibashi (the KAI model)....
article 2015
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Jolt Oostra, A. (author), Blom, P.W.M. (author), Michels, J.J. (author)
Pinholes in the emitting layer of an organic light emitting diode (OLED), e.g. induced by particle contamination or processing flaws, lead to direct contact between the hole-injection layer (HIL) and the cathode. The resulting short circuits give rise to catastrophic device failure. We demonstrate that these short circuits can be effectively...
article 2014
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Grossiord, N. (author), de Bruyn, P. (author), Moet, D.J.D. (author), Andriessen, R. (author), Blom, P.W.M. (author)
A wide range of characterization techniques are used to study spin-coated films of zinc oxide (ZnO) obtained from thermal decomposition of zinc acetylacetonate hydrate. Inverted organic solar cells with ZnO transport layers were prepared. Deposition conditions of the solution onto the substrate (e.g. substrate temperature) were found to be...
article 2014
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Abbaszadeh, D. (author), Nicolai, H.T. (author), Crəciun, N.I. (author), Blom, P.W.M. (author)
The operation of blue light-emitting diodes based on polyspirobifluorene with a varying number of N,N,N′,N′ tetraaryldiamino biphenyl (TAD) hole-transport units (HTUs) is investigated. Assuming that the electron transport is not affected by the incorporation of TAD units, model calculations predict that a concentration of 5% HTU leads to an...
article 2014
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Abbaszadeh, D. (author), Wetzelaer, G.A.H. (author), Nicolai, H.T. (author), Blom, P.W.M. (author)
The quenching of excitons at the poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) PEDOT:PSS) anode in blue polyalkoxyspirobifluorene-arylamine polymer light-emitting diodes is investigated. Due to the combination of a higher electron mobility and the presence of electron traps, the recombination zone shifts from the cathode to the...
article 2014
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Oostra, A.J. (author), van den Bos, K.H.W. (author), Blom, P.W.M. (author), Michels, J.J. (author)
The effect of hypochlorite treatment on the layer thickness and conductivity of a state-of-the-art high conducting poly(3,4- ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is investigated as a function of exposure time and hypochlorite concentration. Because of overoxidation by the hypochlorite the PEDOT:PSS conductivity is...
article 2013
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Grossiord, N. (author), Kroon, J.M. (author), Andriessen, H.A.J.M. (author), Blom, P.W.M. (author)
In the present review, the main degradation mechanisms occurring in the different layer stacking (i.e. photoactive layer, electrode, encapsulation film, interconnection) of polymeric organic solar cells and modules are discussed. Bulk and interfacial, as well as chemical and physical degradation mechanisms are reviewed, as well as their...
article 2012
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Brondijk, J.J. (author), Maddalena, F. (author), Asadi, K. (author), van Leijen, H.J. (author), Heeney, M. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
We investigate the mobility of poly(3-hexylthiophene) (P3HT) over a carrier-density range from 1015 to 1020cm-3. Hole-only diodes were used for densities below 1016cm-3 and field-effect transistors were used for carrier densities higher than 1018cm-3. To fill the gap, intermediate densities were probed using chemically doped Schottky diodes and...
article 2012
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Wetzelaer, G.-J.A.H. (author), Kuik, M. (author), Olivier, Y. (author), Lemaur, V. (author), Cornil, J. (author), Fabiano, S. (author), Loi, M.A. (author), Blom, P.W.M. (author)
Electron- and hole-transport properties of the n-type copolymer poly{[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2, 6-diyl]-alt-5,5′-(2,2′-dithiophene)} [P(NDI2OD-T2), PolyeraActivInk™ N2200] are investigated. Electron- and hole-only devices with Ohmic contacts are demonstrated, exhibiting trap-free space-charge-limited...
article 2012
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Li, M. (author), Stingelin, N. (author), Michels, J.J. (author), Spijkman, M.-J. (author), Asadi, K. (author), Beerends, R. (author), Biscarini, F. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
The processing of solution-based binary blends of the ferroelectric random copolymer poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE) and the semiconducting polymer poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) applied by spin-coating and wire-bar coating is investigated. By systematic variation of blend composition, solvent, and deposition...
article 2012
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Brondijk, J.J. (author), Spijkman, M. (author), van Seijen, F. (author), Blom, P.W.M. (author), de Leeuw, D.M. (author)
An inversion current in unipolar organic field-effect transistors is not observed, which can be due to trapping of electrons or to negligible electron injection. Here, we distinguish between both cases by studying the depletion current of unipolar p-type transistors based on a deliberately doped organic semiconductor. For each doping level, the...
article 2012
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