SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WAKA:ref ;pers:(Inganäs Olle)"

Sökning: WAKA:ref > Inganäs Olle

Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
  • Aasmundtveit, K.E., et al. (författare)
  • Structural anisotropy of poly(alkylthiophene) films
  • 2000
  • Ingår i: Macromolecules. - 0024-9297. ; 33:8, s. 3120-3127
  • Tidskriftsartikel (refereegranskat)abstract
    • The structural anisotropy of various poly(alkylthiophene) films have been studied by X-ray diffraction, using both conventional methods and synchrotron radiation at grazing incidence. Solution-cast films orient with the side chains preferably normal to the film surface, whereas spin-cast films of nonstereoregular material orient with both the main and the side chains in the film plane. For thick (10-50 µm) solution-cast films, the degree of orientation depends strongly on the solvent used for casting, and on the stereoregularity of the polymer, films of stereoregular materials being more oriented than those of nonregular materials. The most oriented nonregular films are those cast from mixtures of chloroform and tetrahydrofuran. Thin (50-500 nm) solution-cast films are more oriented than the thicker ones, and the effects of different stereoregularity or different casting solvents are small. For spin-cast films, the degree of orientation is independent of substrate and solvent. Spin-cast films of stereoregular material have two different phases: One with the side chains normal to the substrate, and another where they are parallel to the substrate. The diffraction peaks of spin-cast poly(octylthiophene) narrow considerably upon heating.
  •  
2.
  • Aasmundtveit, K.E., et al. (författare)
  • Structural aspects of electrochemical doping and dedoping of poly(3,4-ethylenedioxythiophene)
  • 2000
  • Ingår i: Synthetic metals. - 0379-6779. ; 113:1, s. 93-97
  • Tidskriftsartikel (refereegranskat)abstract
    • Electrochemical dedoping and redoping of p-toluene sulfonate doped poly(3,4-ethylenedioxythiophene) (PEDOT) has been studied with in situ grazing incidence diffraction with water used as an electrolyte. The diffraction peak positions and integrated intensities do not change significantly during doping and dedoping, while the peak widths increase upon dedoping and decrease upon doping. This implies that the lattice parameters and the relative positions of the polymer chains and the p-toluene sulfonate ions remain unchanged, the redox processes being carried out by the motion of smaller ions between the polymer and the electrolyte, and that the structural order decreases upon dedoping and increases upon doping in a reversible manner.
  •  
3.
  • Aasmundtveit, K.E., et al. (författare)
  • Structural ordering in phenyl-substituted polythiophenes
  • 2000
  • Ingår i: Macromolecules. - 0024-9297. ; 33:15, s. 5481-5489
  • Tidskriftsartikel (refereegranskat)abstract
    • Various substituted poly(phenylthiophene)s have been studied by X-ray diffraction. They are semicrystalline, with very different degrees of crystallinity. Those with para-substituted phenyl groups have a low degree of crystallinity, whereas those with ortho-substituted phenyl groups are more crystalline. The most crystalline materials in this study have two equally long substituents on the phenyl ring, one at the ortho position and the other at the ortho or meta position on the opposite side of the phenyl ring. Poly(3-(2,5-dioctylphenyl)thiophene) (PDOPT) was most thoroughly studied, and a structural model is proposed. The structure of PDOPT is quite different from previously studied substituted polythiophenes in that the octyl side chains are directed normal to the thiophene planes. In this way, the conjugated polymer chains are kept separated from each other. Solution-cast and spin-cast PDOPT films are anisotropic, with the octyl side chains oriented normal to the film surface in both cases. This is contrary to the situation for poly(3-alkylthiophene)s, where solution-cast and spin-cast films orient in different ways.
  •  
4.
  • Admassie, Shimelis, et al. (författare)
  • A polymer photodiode using vapour-phase polymerized PEDOT as an anode
  • 2005
  • Ingår i: Solar Energy Materials and Solar Cells. - 0927-0248. ; 90, s. 133-141
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the photovoltaic properties of devices made using a highly conducting polymer electrode, from vapor-phase polymd. poly (3,4-ethylenedioxy) thiophene (VPP PEDOT) on glass substrate as an anode and a polyfluorene copolymer poly[2,7-(9,9-dioctyl-fluorene)-alt-5,5-(4',7'-di-2thienyl-2',1'3'-benzothiadiazole)] (APFO-3) mixed with [6,6]-phenyl-C61-butyric acid methylester (PCBM) in the ratio of 1:4 as the active layer. The device performance was compared with that of devices made with PEDOT-PSS on glass substrates. The surfaces of VPP PEDOT were imaged using at. force microscopy (AFM). [on SciFinder (R)]
  •  
5.
  • Admassie, Shimelis, et al. (författare)
  • A renewable biopolymer cathode with multivalent metal ions for enhanced charge storage
  • 2014
  • Ingår i: JOURNAL OF MATERIALS CHEMISTRY A. - Royal Society of Chemistry. - 2050-7488. ; 2:6, s. 1974-1979
  • Tidskriftsartikel (refereegranskat)abstract
    • A ternary composite supercapacitor electrode consisting of phosphomolybdic acid (HMA), a renewable biopolymer, lignin, and polypyrrole was synthesized by a simple one-step simultaneous electrochemical deposition and characterized by electrochemical methods. It was found that the addition of HMA increased the specific capacitance of the polypyrrole-lignin composite from 477 to 682 F g(-1) ( at a discharge current of 1 A g(-1)) and also significantly improved the charge storage capacity from 6(to 128 mA h g(-1).
  •  
6.
  • Admassie, Shimelis, et al. (författare)
  • Electrochemical and optical studies of the band gaps of alternating polyfluorene copolymers
  • 2006
  • Ingår i: Synthetic Metals. ; 156:7-8, s. 614-623
  • Tidskriftsartikel (refereegranskat)abstract
    • The electrochemical and optical properties of a series of alternating polyfluorene copolymers with low band gaps were determined. These polymers incorporated fluorene units alternating with groups including electron-withdrawing (A) and electron-donating (D) groups in donor-acceptor-donor (DAD) sequence to achieve the lowering of band gaps. The polymers were solvent-casted on platinum disk electrode and the band gaps were estimated from cyclic voltammetry (CV). These values were compared with values obtained from optical absorption measurements. Although the electrochemically determined band gaps were found to be slightly higher than the optical band gap in most cases, values are well correlated. The values of the band gaps determined range from 2.1 to 1.3 eV. © 2006 Elsevier B.V. All rights reserved.
  •  
7.
  • Admassie, S., et al. (författare)
  • Electrochromism in diffractive conducting polymer gratings
  • 2004
  • Ingår i: Journal of the Electrochemical Society. - 0013-4651. ; 151:6
  • Tidskriftsartikel (refereegranskat)abstract
    • The electrochromic polymer poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT-PSS) spin-coated on ITO/glass was patterned with a soft lithographic method in order to diffract the incident light and thereby modify absorption of light by the film to improve the electrochromic efficiency of the polymer. The absorbance peak at around 610 nm was found to be much higher in the patterned PEDOT-PSS film than the one observed in the unpatterned film. Values of coloration efficiencies varying from 107 to 174 cm2/C were obtained for three different unpatterned PEDOT-PSS films, whereas for three different patterned PEDOT-PSS films higher values ranging from 211 to 371 cm2/C were found. These increased values of the electrochromic efficiencies are attributed to diffraction. © 2004 The Electrochemical Society. All rights reserved.
  •  
8.
  • Amarasinghe Vithanage, Dimali, et al. (författare)
  • Charge Carrier Dynamics of Polymer : Fullerene Blends: From Geminate to Non-Geminate Recombination
  • 2014
  • Ingår i: Advanced Energy Materials. - Wiley-VCH Verlagsgesellschaft. - 1614-6832, EISSN 1614-6840. ; 4:8
  • Tidskriftsartikel (refereegranskat)abstract
    • The charge carrier dynamics of a new polymer-fullerene blend are examined on the femtosecond to the millisecond time scale. The full time range is globally fitted using a chemical reaction rate model that includes all key processes, charge generation, energy transfer, charge separation, and recombination, over the full 12 orders of magnitude in time and a factor of 33 in light intensity. Particular attention is paid to the charge recombination processes and it is found that they are highly material specific. Comparison of the dynamics to those of a previously studied polymer: fullerene blend reveals that while for one blend the recombination dynamics are mainly controlled by geminate recombination, the charge recombination in the presently studied polymer: fullerene blend are entirely controlled by non-geminate electron-hole recombination. Carrier density dependence of the non-geminate recombination rate is analyzed and a correlated disorder model of site energies is proposed to explain the observed dependency.
  •  
9.
  • Andersson, Lars Mattias, et al. (författare)
  • Acceptor influence on hole mobility in fullerene blends with alternating copolymers of fluorene
  • 2006
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 88, s. 082103
  • Tidskriftsartikel (refereegranskat)abstract
    • Hole mobility in polyfluorene/fullerene blends has been studied with field effect transistors. Two different C60 derivatives and one C70 derivative have been investigated together with two different polyfluorenes. Mobility is presented as a function of acceptor loading at ratios suitable for photovoltaics and varies between 10–3 and 10–5  cm2  V–1  s–1 depending on the polymer/acceptor combination. The hole mobility is increased in blends with the commonly used acceptor [6-6]-phenyl-C61-butyric acid methylester (PCBM). With related C60 and C70 derivatives the hole mobility is decreased under the same circumstances.
  •  
10.
  • Andersson, Lars Mattias, et al. (författare)
  • Bipolar transport observed through extraction currents on organic photovoltaic blend materials
  • 2006
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 89, s. 142111
  • Tidskriftsartikel (refereegranskat)abstract
    • Both electron and hole mobilities have been simultaneously measured through charge extraction by linearly increasing voltage on polymer heterojunction solar cells with varying stoichiometry of polymer and acceptor. The polymer is a low band gap copolymer of fluorene, thiophene, and electron accepting groups named APFO-Green 5, and the acceptor is [6,6]-phenyl-C61-butyric acid methylester. Results are correlated to field effect transistor measurements on the same material system. A monotonous increase in mobility for both carrier types is observed with increased acceptor loading.
  •  
Skapa referenser, mejla, bekava och länka
Åtkomst
fritt online (23)
Typ av publikation
tidskriftsartikel (290)
konferensbidrag (15)
Typ av innehåll
refereegranskat (305)
Författare/redaktör
Zhang, Fengling, (56)
Andersson, Mats R, (48)
Inganäs, Olle, 1951- ... (37)
Inganas, O. (33)
Andersson, M.R., (31)
visa fler...
Andersson, Mats R., ... (27)
Berggren, Magnus, (26)
Tvingstedt, Kristofe ... (21)
Svensson, M. (18)
Theander, M. (18)
Andersson, MR (17)
Sundström, Villy (15)
Nilsson, Peter (15)
Inganaes, Olle (14)
Müller, Christian (14)
Andersson, Mattias (14)
Johansson, Tomas, (13)
Wang, Xiangjun, (13)
Hellström, Stefan, 1 ... (13)
Zhang, F. L. (13)
Hellstrom, Stefan, (13)
Zhang, Fengling, 196 ... (12)
Mammo, Wendimagegn (12)
Vandewal, Koen, (12)
Herland, Anna, (12)
Sundstrom, V, (12)
Gadisa, Abay (12)
Inganas, Olle (11)
Hamedi, Mahiar, (11)
Wang, Ergang, 1981-, (11)
Hjertberg, T., (10)
Andersson, Viktor, (10)
Bergqvist, Jonas, (10)
Björk, Per, (10)
Pettersson, Lars, (9)
Gustafsson, Göran (9)
Wennerström, O., (9)
Perzon, Erik, (9)
Tang, Zheng (9)
Granström, Magnus, (9)
Roman, L.S., (8)
Lundström, Ingemar, (8)
Admassie, Shimelis, (8)
Persson, Nils-Kriste ... (8)
Wang, Ergang, (8)
Granlund, T. (8)
Ruseckas, A (8)
Mammo, W., (7)
Perzon, Erik, 1977-, (7)
visa färre...
Lärosäte
Linköpings universitet (299)
Chalmers tekniska högskola (58)
Lunds universitet (22)
Kungliga Tekniska Högskolan (7)
Karlstads universitet (4)
Umeå universitet (2)
visa fler...
Uppsala universitet (1)
Högskolan i Borås (1)
visa färre...
Språk
Engelska (305)
Ämne (HSV)
Naturvetenskap (50)
Teknik (7)

År

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy