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702 results on '"Koster L"'

106. Organic Photovoltaics

Author

Gao, Feng, primary, Koster, L. Jan Anton, additional, Nguyen, Thuc-Quyen, additional, and Stingelin, Natalie, additional

Published
2018
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110. The effect of morphology upon mobility: Implications for bulk heterojunction solar cells with nonuniform blend morphology.

Author

Groves, C., Koster, L. J. A., and Greenham, N. C.

Subjects
*MONTE Carlo method, *HETEROJUNCTIONS, *SOLAR cells, *PHOTOVOLTAIC power generation, *MORPHOLOGY
Abstract

We use a Monte Carlo model to predict the effect of composition, domain size, and energetic disorder upon the mobility of carriers in an organic donor-acceptor blend. These simulations show that, for the changes in local morphology expected within the thickness of a typical bulk heterojunction photovoltaic device, changes in mobility of more than an order of magnitude are expected. The impact of nonuniform mobility upon space-charge-limited diode and photovoltaic (PV) device performance is examined using a drift-diffusion model. The current passing through a space-charge-limited diode is shown to depend upon the position of the layers with differing mobility. Accurate modeling of the current in such devices can only be achieved using a drift-diffusion model incorporating nonuniform mobility. Inserting a 20 nm thick layer in which the mobility is less by one order of magnitude than in the rest of the 70 nm thick PV device reduced the device efficiency by more than 20%. Therefore it seems vital to exert a high degree of control over the morphology throughout the entire blend PV device, otherwise potential PV performance may be lost. [ABSTRACT FROM AUTHOR]

Published
2009
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111. Charge transport in MDMO-PPV:PCNEPV all-polymer solar cells.

Author

Mandoc, M. Magdalena, Veurman, Welmoed, Koster, L. Jan Anton, Koetse, Marc M., Sweelssen, Jorgen, de Boer, Bert, and Blom, Paul W. M.

Subjects
SOLAR cells, POLYMERS, ELECTRONS, ELECTRIC currents, HETEROJUNCTIONS
Abstract

Charge transport properties are investigated of blends of poly [2-methoxy-5-(3′, 7′-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) and poly-[oxa-1,4-phenylene-(1-cyano-1,2-vinylene)-(2-methoxy-5-(3′, 7′-dimethyloctyloxy)-1,4-phenylene)-1,2-(2-cyanovinylene)-1,4-phenylene] (PCNEPV). The hole transport in the MDMO-PPV donor phase of the 1:1 weight ratio blend is trap-free space-charge limited, with a mobility identical to the pristine polymer. The electron current in the PCNEPV acceptor phase is strongly reduced by traps that are exponentially distributed in energy. The current in MDMO-PPV:PCNEPV bulk heterojunction solar cells is therefore unbalanced and dominated by the holes in the MDMO-PPV phase. [ABSTRACT FROM AUTHOR]

Published
2007
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113. Outcome of patients with Myelofibrosis relapsing after allogeneic stem cell transplant: a retrospective study by the Chronic Malignancies Working Party of EBMT

Author

McLornan, Donal P., Szydlo, Richard, Robin, M., Biezen, Anja van, Koster, L, Blok, Henrik J.P., Schaap, M., Chalandon, Y., Kroeger, Nicolaus, McLornan, Donal P., Szydlo, Richard, Robin, M., Biezen, Anja van, Koster, L, Blok, Henrik J.P., Schaap, M., Chalandon, Y., and Kroeger, Nicolaus

Abstract

Item does not contain fulltext

Published
2018

115. Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics

Author

Kiefer, David, Giovannitti, Alexander, Sun, Hengda, Biskup, Till, Hofmann, Anna, Koopmans, Marten, Cendra, Camila, Weber, Stefan, Koster, L. Jan Anton, Olsson, Eva, Rivnay, Jonathan, Fabiano, Simone, McCulloch, Iain, Muller, Christian, Kiefer, David, Giovannitti, Alexander, Sun, Hengda, Biskup, Till, Hofmann, Anna, Koopmans, Marten, Cendra, Camila, Weber, Stefan, Koster, L. Jan Anton, Olsson, Eva, Rivnay, Jonathan, Fabiano, Simone, McCulloch, Iain, and Muller, Christian

Abstract

N-doping of conjugated polymers either requires a high dopant fraction or yields a low electrical conductivity because of their poor compatibility with molecular dopants. We explore n doping of the polar naphthalenediimide-bithiophene copolymer p(gNDI-gT2) that carries oligoethylene glycol-based side chains and show that the polymer displays superior miscibility with the benzimidazole-dimethylbenzenamine-based n-dopant N-DMBI. The good compatibility of p(gNDI-gT2) and N-DMBI results in a relatively high doping efficiency of 13% for n-dopants, which leads to a high electrical conductivity of more than 10(-1) S cm(-1) for a dopant concentration of only 10 mol % when measured in an inert atmosphere. We find that the doped polymer is able to maintain its electrical conductivity for about 20 min when exposed to air and recovers rapidly when returned to a nitrogen atmosphere. Overall, solution coprocessing of p(gNDI-gT2) and N-DMBI results in a larger thermoelectric power factor of up to 0.4 mu W K-2 m(-1) compared to other NDI-based polymers., Funding Agencies|Swedish Research Council [2016-06146, 2016-03979]; Knut and Alice Wallenberg Foundation through a Wallenberg Academy Fellowship, and the European Research Council (ERC) [637624]; VINNOVA [2015-04859]

Published
2018
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116. Organic Photovoltaics

Author

Gao, Feng, Koster, L. Jan Anton, Nguyen, Thuc-Quyen, Stingelin, Natalie, Gao, Feng, Koster, L. Jan Anton, Nguyen, Thuc-Quyen, and Stingelin, Natalie

Abstract

n/a

Published
2018
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117. Bilayer–ternary polymer solar cells fabricated using spontaneous spreading on water

Author

Colberts, Fallon J.M., Wienk, Martijn M., Heuvel, Ruurd, Li, Weiwei, Le Corre, Vincent M., Koster, L. Jan Anton, Janssen, René A.J., Colberts, Fallon J.M., Wienk, Martijn M., Heuvel, Ruurd, Li, Weiwei, Le Corre, Vincent M., Koster, L. Jan Anton, and Janssen, René A.J.

Abstract

A new method is presented to fabricate bilayer organic solar cells via sequential deposition of bulk-heterojunction layers obtained using spontaneous spreading of polymer–fullerene blends on a water surface. Using two layers of a small bandgap diketopyrrolopyrrole polymer–fullerene blend, a small improvement in power conversion efficiency (PCE) from 4.9% to 5.1% is obtained compared to spin-coated devices of similar thickness. Next, bilayer–ternary cells are fabricated by first spin coating a wide bandgap thiophene polymer–fullerene blend, followed by depositing a small bandgap diketopyrrolopyrrole polymer–fullerene layer by transfer from a water surface. These novel bilayer–ternary devices feature a PCE of 5.9%, higher than that of the individual layers. Remarkable, external quantum efficiencies (EQEs) over 100% are measured for the wide bandgap layer under near-infrared bias light illumination. Drift-diffusion calculations confirm that near-infrared bias illumination can result in a significant increase in EQE as a result of a change in the internal electric field in the device, but cannot yet account for the magnitude of the effect. The experimental results indicate that the high EQEs over 100% under bias illumination are related to a barrier for electron transport over the interface between the two blends.

Published
2018

118. Salvage use of allogeneic HSCT after reduced intensity conditioning from unrelated donors in multiple myeloma: outcomes from 10/10 HLA-matched unrelated donors, 9/10 HLA-mismatched unrelated donors and cord blood. A study by the EBMT and Eurocord

Author

Michallet, M., Sobh, M., Dubois, V., Iacobelli, S., Koster, L., Biezen, A. van, Ceballos, P., Tabrizi, R., Finke, J., El-Cheikh, J., Schipperus, M., Meijer, E., Veelken, J.H., Petersen, E., Russell, N., Tholouli, E., Passweg, J., Garban, F., Schoemans, H., Chevalier, P., Maillard, N., Volin, L., Francois, S., Lioure, B., Beguin, Y., Gluckman, E., Ruggeri, A., Garderet, L., Kroger, N., and EBMT Chronic Malignancies Working

Published
2016

119. Comparison of Haematopoietic Stem Cell Transplantation Approaches in Primary Plasma Cell Leukaemia

Author

Lawless, S., Iacobelli, S., Biezen, A., Koster, L., Chevallier, P., Blaise, D., Foa, R., Tabriz, R., Nicolaas Schaap, Lenhoff, S., Russell, N., Poire, X., Petersen, E., Cornelissen, J., Di Bartolomeo, P., Wilson, K. M., Schoenland, S., Schipperus, M., Lioure, B., Arcese, W., Mufti, G., Snowden, J., Finke, J., Morris, C., Garderet, L., Kroeger, N., and Chronic Malignancies Working Party

Published
2016

120. Controlling n-Type Molecular Doping viaRegiochemistry and Polarity of Pendant Groups on Low Band Gap Donor–Acceptor Copolymers

Author

Ye, Gang, Liu, Jian, Qiu, Xinkai, Stäter, Sebastian, Qiu, Li, Liu, Yuru, Yang, Xuwen, Hildner, Richard, Koster, L. Jan Anton, and Chiechi, Ryan C.

Abstract

We demonstrate the impact of the type and position of pendant groups on the n-doping of low-band gap donor–acceptor (D–A) copolymers. Polar glycol ether groups simultaneously increase the electron affinities of D–A copolymers and improve the host/dopant miscibility compared to nonpolar alkyl groups, improving the doping efficiency by a factor of over 40. The bulk mobility of the doped films increases with the fraction of polar groups, leading to a best conductivity of 0.08 S cm–1and power factor (PF) of 0.24 μW m–1K–2in the doped copolymer with the polar pendant groups on both the D and A moieties. We used spatially resolved absorption spectroscopy to relate commensurate morphological changes to the dispersion of dopants and to the relative local doping efficiency, demonstrating a direct relationship between the morphology of the polymer phase, the solvation of the molecular dopant, and the electrical properties of doped films. Our work offers fundamental new insights into the influence of the physical properties of pendant chains on the molecular doping process, which should be generalizable to any molecularly doped polymer films.

Published
2021
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121. Enhancing Molecular n‐Type Doping of Donor–Acceptor Copolymers by Tailoring Side Chains

Author

Liu, Jian, primary, Qiu, Li, additional, Alessandri, Riccardo, additional, Qiu, Xinkai, additional, Portale, Giuseppe, additional, Dong, JingJin, additional, Talsma, Wytse, additional, Ye, Gang, additional, Sengrian, Aprizal Akbar, additional, Souza, Paulo C. T., additional, Loi, Maria Antonietta, additional, Chiechi, Ryan C., additional, Marrink, Siewert J., additional, Hummelen, Jan C., additional, and Koster, L. Jan Anton, additional

Published
2018
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122. Enhanced n-Doping Efficiency of a Naphthalenediimide-Based Copolymer through Polar Side Chains for Organic Thermoelectrics

Author

Kiefer, David, primary, Giovannitti, Alexander, additional, Sun, Hengda, additional, Biskup, Till, additional, Hofmann, Anna, additional, Koopmans, Marten, additional, Cendra, Camila, additional, Weber, Stefan, additional, Anton Koster, L. Jan, additional, Olsson, Eva, additional, Rivnay, Jonathan, additional, Fabiano, Simone, additional, McCulloch, Iain, additional, and Müller, Christian, additional

Published
2018
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134. Haploidentical transplant in patients with myelodysplastic syndrome

Author

Robin, M., Porcher, R., Ciceri, F., Lint, M.T. van, Santarone, S., Ehninger, G., Blaise, D., Gullbas, Z., Gonzales Muniz, S., Michallet, M., Velardi, A., Koster, L, Maertens, J., Sierra, J., Selleslag, D., Radujkovic, A., Diez-Martin, J.L., Kanz, L., Arroyo, C.H., Niederwieser, D., Huang, H., McDonald, A., Witte, T.J. de, Koc, Y., Kroger, N., Robin, M., Porcher, R., Ciceri, F., Lint, M.T. van, Santarone, S., Ehninger, G., Blaise, D., Gullbas, Z., Gonzales Muniz, S., Michallet, M., Velardi, A., Koster, L, Maertens, J., Sierra, J., Selleslag, D., Radujkovic, A., Diez-Martin, J.L., Kanz, L., Arroyo, C.H., Niederwieser, D., Huang, H., McDonald, A., Witte, T.J. de, Koc, Y., and Kroger, N.

Abstract

Item does not contain fulltext, The only curative treatment in patients with intermediate or high-risk myelodysplastic syndrome (MDS) is allogeneic hematopoietic stem cell transplantation (HSCT), which usually results in a long-term, disease-free survival rate of between 30% and 50%, depending on the disease risk and the type of donor. In patients without an HLA-matched sibling donor, a family haploidentical donor is an alternative option. The present study reports the European Group for Blood and Marrow Transplantation activity for haploidentical transplantation in MDS patients. A total of 228 patients transplanted from a mismatched HLA-related donor between 2007 and 2014 were studied. The median age at transplant was 56 years. Eighty-four (37%) patients had MDS transformed into acute myeloid leukemia at the time of transplant. Ex vivo T-cell depletion was used in 34 patients. One hundred ninety-four patients received a T-cell replete transplant and 102 patients received posttransplant cyclophosphamide (PT-CY) as graft-versus-host disease (GVHD) prophylaxis. The cumulative incidences of acute and chronic GVHD in PT-CY vs other patients were 25% vs 37% and 37% vs 24%, respectively. The cumulative incidence of nonrelapse mortality was 55% in patients who did not receive PT-CY (no PT-CY) and 41% in patients who did receive PT-CY. Three-year overall survival was 28% in no PT-CY patients and 38% in PT-CY patients. In multivariable analysis, the main risk factors were the intensity of the conditioning regimen and the use of PT-CY. In conclusion, the outcomes of MDS patients who received an haploidentical transplant are close to the results other transplantations from HLA-mismatched donors with approximately one-third of patients alive and free of disease 3 years after transplant, and the use of PT-CY may improve their outcomes.

Published
2017

136. Modeling the photocurrent of poly-phenylene vinylene/fullerene-based solar cells

Author

Koster, L J A, Mihailetchi, V D, Blom, P W M, Kafafi, ZH, and Lane, PA

Subjects
Photocurrent, Materials science, Organic solar cell, Poly(p-phenylene vinylene), organic solar cells, simulation, Molecular physics, Polymer solar cell, law.invention, charge transport, chemistry.chemical_compound, chemistry, law, Electric field, Solar cell, Organic chemistry, Charge carrier, photoconduction, Diffusion (business)
Abstract

We have studied the photocurrent data of 20:80 wt% blends of poly(2-methoxy-5-(3',7'-dimethyloctyloxy)-p-phenylene vinylene) (MDMO-PPV) and [6,6]-phenyl C-61-butyric acid methyl ester (PCBM) bulk heterojunction solar cells. Two cases have been investigated: When only drift of charge carriers is taken into account, a voltage-independent photocurrent is expected, corresponding to the extraction of all generated charges. It is demonstrated that the experimental data are in disagreement with this prediction. However, when both drift and diffusion of charges are taken into account, the predicted photocurrent shows a different behavior: At low electric fields a linear behavior is predicted, which results from the diffusion of charges, followed by saturation at high fields. The agreement between the numerical result and the experimental data obtained from MDMO-PPV:PCBM cells is satisfactory when a charge carrier generation rate of G=1.6 x 10(27) m(-3)s(-1) is used showing the importance of diffusion at low fields, i.e., near the open-circuit voltage.

Published
2004

144. Impaired longitudinal deformation measured by speckle-tracking echocardiography in children with end-stage renal disease

Author

Huis, M. van, Schoenmaker, N.J., Groothoff, J.W., Lee, J.H. van der, Dyk, M. van, Gewillig, M.H., Koster, L., Tanke, R.B., Lilien, M., Blom, N.A., Mertens, L., Kuipers, I.M., Huis, M. van, Schoenmaker, N.J., Groothoff, J.W., Lee, J.H. van der, Dyk, M. van, Gewillig, M.H., Koster, L., Tanke, R.B., Lilien, M., Blom, N.A., Mertens, L., and Kuipers, I.M.

Abstract

Contains fulltext : 172768.pdf (Publisher’s version ) (Open Access)

Published
2016

145. Outcomes of mismatched related allogeneic stem cell transplantation for chronic lymphocytic leukemia: a retrospective study on behalf of the chronic malignancies working party of the EBMT

Author

van Gorkom, G., van Gelder, M., Ziagkos, D., Koster, L., Koc, Y., van Lint, M., Ciceri, F., Selleslag, D., Blaise, D., Foa, R., Beelen, D., Corradini, P., Moreno, C., Carlson, K., Solano, C., Mueller, L. P., Castagna, L., Tischer, J., Hilgendorf, I., Hallek, M., Bittenbring, J., Theobald, M., Schetelig, J., Kroeger, N., van Gorkom, G., van Gelder, M., Ziagkos, D., Koster, L., Koc, Y., van Lint, M., Ciceri, F., Selleslag, D., Blaise, D., Foa, R., Beelen, D., Corradini, P., Moreno, C., Carlson, K., Solano, C., Mueller, L. P., Castagna, L., Tischer, J., Hilgendorf, I., Hallek, M., Bittenbring, J., Theobald, M., Schetelig, J., and Kroeger, N.

Published
2016

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