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Your search keyword '"Wienk, Martijn M."' showing total 25 results
Start Over Author "Wienk, Martijn M." Journal journal of the american chemical society
25 results on '"Wienk, Martijn M."'

1. High-spin cation radicals of methylenephosphoranes

Author

Wienk, Martijn M. and Janssen, Rene A.J.

Subjects
Cations -- Analysis, Radicals (Chemistry) -- Observations, Molecular rotation -- Observations, Spectrum analysis -- Usage, Chemistry
Abstract

The formation and characterization of two-novel high-spin molecules containing two and three methylenephosrane cation radicals as spin centers, linked via central 1,3-phenylene and 1,3,5-benzenetriyl coupling units, are described in this experiment through the use of ESR spectroscopy. It was observed that the novel di(cation radical) and the tri(cation radical) are generated via electrochemical or chemical oxidation reactions.

Published
1997

2. Polymer Solar Cells : solubility controls fiber network formation

Author

van Franeker, Jacobus J., Heintges, Gael H. L., Schaefer, Charley, Portale, Giuseppe, Li, Weiwei, Wienk, Martijn M., van der Schoot, Paul, Janssen, Rene A. J., Sub Algemeen Theoretical Physics, Theoretical Physics, Sub Algemeen Theoretical Physics, Theoretical Physics, Macromolecular and Organic Chemistry, Soft Matter and Biological Physics, and Molecular Materials and Nanosystems

Subjects
MORPHOLOGY CONTROL, ADDITIVES, EFFICIENCY ENHANCEMENT, DIKETOPYRROLOPYRROLE, Nucleation, FIBRIL WIDTH, Biochemistry, Oligomer, BLENDS, Catalysis, Polymer solar cell, law.invention, chemistry.chemical_compound, Colloid and Surface Chemistry, Photoactive layer, law, Solar cell, Polymer chemistry, Fiber, Solubility, chemistry.chemical_classification, PHOTOVOLTAIC CELLS, Chemistry, General Chemistry, Polymer, AGGREGATION, MOLECULAR-WEIGHT, Chemical engineering, PHASE-SEPARATION
Abstract

The photoactive layer of polymer solar cells is commonly processed from a four-component solution, containing a semiconducting polymer and a fullerene derivative dissolved in a solvent cosolvent mixture. The nanoscale dimensions of the polymer fullerene morphology that is formed upon drying determines the solar cell performance, but the fundamental processes that govern the size of the phase-separated polymer and fullerene domains are poorly understood. Here, we investigate morphology formation of an alternating copolymer of diketopyrrolopyrrole and a thiophene-phenyl-thiophene oligomer (PDPPTPT) with relatively long 2-decyltetradecyl (DT) side chains blended with [6,6]-phenyl-C-71-butyric acid methyl ester. During solvent evaporation the polymer crystallizes into a fibrous network. The typical width of these fibers is analyzed by quantification of transmission electron microscopic images, and is mainly determined by the solubility of the polymer in the cosolvent and the molecular weight of the polymer. A higher molecular weight corresponds to a lower solubility and film processing results in a smaller fiber width. Surprisingly, the fiber width is not related to the drying rate or the amount of cosolvent. We have made solar cells with fiber widths ranging from 28 to 68 nm and found an inverse relation between fiber width and photocurrent. Finally, by mixing two cosolvents, we develop a ternary solvent system to tune the fiber width. We propose a model based on nucleation-and-growth which can explain these measurements. Our results show that the width of the semicrystalline polymer fibers is not the result of a frozen dynamical state, but determined by the nucleation induced by the polymer solubility.

Published
2015
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3. Stable triplet-state di(cation radicals) of a meta-para aniline oligomer by 'acid doping.'

Author

Wienk, Martijn M. and Janssen, Rene A.J.

Subjects
Cations -- Research, Radicals (Chemistry) -- Research, Aniline -- Research, Chemistry
Abstract

A stable triplet-state oligoaniline di(cation radical) was produced through a proton-triggered redox reaction between N,N'-bis(4-(phenylamino)phenyl)-1,3-benzenediamine (1) and N,N'-bis(4-(phenylimino)-cyclohexa-2,5-dienylidene)-1,3-benzenediamine (2). In this reaction 1 was oxidized, while protonated 2 was reduced. Variable-temperature ESR measurements were consistent with a triplet ground state for 1(super 2*2+).

Published
1996

4. Poly(diketopyrrolopyrrole-terthiophene) for ambipolar logic and photovoltaics

Author

Bijleveld, Johan C., Zoombelt, Arjan P., Mathijssen, Simon G.J., Wienk, Martijn M., Turbiez, Mathieu, de Leeuw, Dago M., and Janssen, Rene A.J.

Subjects
Pyrrole -- Chemical properties, Pyrrole -- Electric properties, Thiophene -- Chemical properties, Thiophene -- Electric properties, Chemistry
Abstract

A new semiconducting polymer (PDPP3T) with alternating diketopyrrolopyrrole and terthiophene units is described. The efficiency of the photovoltaics cells is strongly dependent on the molecular weight of PDPP3T and the use of diiodooctane as a processing agent, which is in contrast to the almost constant field-effect transistor (FET) mobility.

Published
2009

5. Functionalized dendritic oligothiophenes: ruthenium phthalocyanine complexes and their application in bulk heterojunction solar cells

Author

Fischer, Markus K.R., Lopez-Duarte, Ismael, Wienk, Martijn M., Martinez-Diaz, M. Victoria, Janssen, Rene A.J., Bauerle, Peter, and Torres, Tomas

Subjects
Organometallic compounds -- Structure, Organometallic compounds -- Chemical properties, Phthalocyanins -- Chemical properties, Ruthenium -- Chemical properties, Solar batteries -- Composition, Solar batteries -- Optical properties, Solar cells -- Composition, Solar cells -- Optical properties, Thiophene -- Chemical properties, Thiophene -- Structure, Chemistry
Abstract

Two series of novel ruthenium(II) phthalocyanine (RuPc) complexes with one [RuPcCOPy-nT] or two [RuPc[(Py-nT).sub.2]] dendritic oligothiophene (DOT) ligands in the axial positions are described. Good efficiencies of up to 1.6% are achieved when blended together with a fullerene acceptor in solution-processed photovoltaic devices, which has provided the phthalocyanine-based bulk heterojunction solar cells.

Published
2009

6. The relationship between nanoscale architecture and function in photovoltaic multichromophoric arrays as visualized by Kelvin probe force microscopy

Author

Palermo, Vincenzo, Otten, Matthijs B.J., Liscio, Andrea, Schwartz, Erik, de Witte, Pieter A.J., Castriciano, Maria Angela, Wienk, Martijn M., Nolde, Fabian, De Luca Giovanna, Cornelissen, Jeroen J.L.M., Janssen, Rene A.J., Mullen, Klaus, Rowan, Alan E., Nolte, Roeland J.M., and Samori, Paolo

Subjects
Cyanides -- Chemical properties, Cyanides -- Electric properties, Cyanides -- Structure, Thiophene -- Chemical properties, Chemistry
Abstract

The nanoscale structural architecture and electronic properties of perylenebis(dicarboximide) (PDI)-functionalized polyisocyanide (P-PDI)-based blends for photovoltaics are analyzed by using Kelvin probe force microscopy. This method has allowed the direct visualization of the photovoltaic activity occurring in such a nanoscale phase-segregated ultrathin film with true nanoscale spatial resolution.

Published
2008

15. Thieno[3,2-b]thiophene−Diketopyrrolopyrrole-Containing Polymers for High-Performance Organic Field-Effect Transistors and Organic Photovoltaic Devices

Author

Bronstein, Hugo, primary, Chen, Zhuoying, additional, Ashraf, Raja Shahid, additional, Zhang, Weimin, additional, Du, Junping, additional, Durrant, James R., additional, Shakya Tuladhar, Pabitra, additional, Song, Kigook, additional, Watkins, Scott E., additional, Geerts, Yves, additional, Wienk, Martijn M., additional, Janssen, Rene A. J., additional, Anthopoulos, Thomas, additional, Sirringhaus, Henning, additional, Heeney, Martin, additional, and McCulloch, Iain, additional

Published
2011
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24. Stable triplet-state di(cation radicals) of a meta-para aniline oligomer by `acid doping'.

Author

Wienk, Martijn M and Janssen, Rene A.J.

Subjects
*ANILINE, *OXIDATION-reduction reaction, *RADICALS (Chemistry)
Abstract

Describes the formation of a stable triplet-state oligoaniline di(cation radical) via a proton-triggered redox reaction between N,N'-bis[4-(phenylamino)phenyl]-1,3-benzenediamine and N,N'-bis[4-(phenylimino)-cyclohexa-2,5-dienylidene]-1,3 -benzenediamine. Characterization of the di(cation radical) with UV/visible/near-IR and ESR spectroscopy.

Published
1996
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25. Thieno[3,2-b]thiophene-diketopyrrolopyrrole-containing polymers for high-performance organic field-effect transistors and organic photovoltaic devices.

Author

Bronstein H, Chen Z, Ashraf RS, Zhang W, Du J, Durrant JR, Tuladhar PS, Song K, Watkins SE, Geerts Y, Wienk MM, Janssen RA, Anthopoulos T, Sirringhaus H, Heeney M, and McCulloch I

Abstract

We report the synthesis and polymerization of a novel thieno[3,2-b]thiophene-diketopyrrolopyrrole-based monomer. Copolymerization with thiophene afforded a polymer with a maximum hole mobility of 1.95 cm(2) V(-1) s(-1), which is the highest mobility from a polymer-based OFET reported to date. Bulk-heterojunction solar cells comprising this polymer and PC(71)BM gave a power conversion efficiency of 5.4%.

Published
2011
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