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Sökning: WAKA:ref > Inganäs Olle > (2005-2009)

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  • 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 electrochem. and optical properties of alternating polyfluorene copolymers with low band gaps were detd. 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 Pt disk electrode and the band gaps were estd. from cyclic voltammetry (CV). These values were compared with values obtained from optical absorption measurements. Although the electrochem. detd. band gaps are slightly higher than the optical band gap in most cases, values are well correlated. The values of the band gaps detd. range from 2.1 to 1.3 eV. [on SciFinder (R)]
  • Andersson, BV, et al. (författare)
  • Imaging of the 3D Nanostructure of a Polymer Solar Cell by Electron Tomography
  • 2009
  • Ingår i: Nano letters (Print). - 1530-6984. ; 9:2, s. 853-855
  • Tidskriftsartikel (refereegranskat)abstract
    • Electron tomography has been used for analyzing the active layer in a polymer solar cell, a bulk heterojunction of an alternating copolymer of fluorene and a derivative of fullerene. The method supplies a three-dimensional representation of the morphology of the film, where domains with different scattering properties may be distinguished. The reconstruction shows good contrast between the two phases included in the film and demonstrates that electron tomography is an adequate tool for investigations of the three-dimensional nanostructure of the amorphous materials used in polymer solar cells.
  • 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.
  • 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.
  • Andersson, Lars Mattias, et al. (författare)
  • Non-equilibrium effects on electronic transport in organic field effect transistors
  • 2007
  • Ingår i: Organic electronics. - 1566-1199. ; 8:4, s. 423-430
  • Tidskriftsartikel (refereegranskat)abstract
    • Non-ideal behavior in organic field effect transistors, in particular threshold voltage drift and light sensitivity, is argued to be due to intrinsic carrier dynamics. The discussion is based on the theory for hopping transport within a Gaussian density of states. Carrier concentration is shown to be of fundamental importance, and the time required to reach equilibrium at different bias is responsible for device behavior, with implications for mobility evaluation. Experimental results from various conjugated polymers in a field effect transistor illustrate the theory.
  • Andersson, Lars Mattias, et al. (författare)
  • Stoichiometry, mobility, and performance in bulk heterojunction solar cells
  • 2007
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 91:7, s. 071108
  • Tidskriftsartikel (refereegranskat)abstract
    • Bipolar transport in blends of a copolymer of fluorene, thiophene and electron accepting groups, and the substituted fullerene [6,6]-phenyl-C61-butyric acid methylester have been studied through charge extraction by linearly increasing voltage on solar cells and with field effect transistors. Between 10% and 90% polymer has been used and the results show a clear correlation to solar cell performance. Optimal solar cells comprise 20% polymer and have a power conversion efficiency of 3.5%. The electron mobility is increasing strongly with fullerene content, but is always lower than the hole mobility, thus explaining the low amount of polymer in optimized devices.
  • Andersson, Mattias, et al. (författare)
  • From short to long - Optical and electrical transients in photovoltaic bulk heterojunctions of polyfluorene/fullerenes
  • 2009
  • Ingår i: Chemical Physics Letters. - 0009-2614. ; 357:1-3, s. 120-123
  • Tidskriftsartikel (refereegranskat)abstract
    • We combine results from transient optical absorption in a bulk heterojunction polymer donor/fullerene acceptor material, obtained in the optical range as well as in the THz range, with results from electrical transients after a short light pulse, to present a unified interpretation of the transport of charge after the very first act of photoinduced charge transfer. We find that the mobility of charges is initially very high, but dramatically reduced with time, to arrive at values three orders of magnitude lower. We show that this can be understood as a consequence of the transport of hot charges by hopping through the density of states, from higher to lower energies.
  • Andersson, Mattias, et al. (författare)
  • Intrinsic and extrinsic influences on the temperature dependence of mobility in conjugated polymers
  • 2008
  • Ingår i: Organic electronics. - Elsevier. - 1566-1199. ; 9:5, s. 569-574
  • Tidskriftsartikel (refereegranskat)abstract
    • The temperature dependence of charge carrier mobility in conjugated polymers and their blends with fullerenes is investigated with different electrical methods, through field effect transistor (FET), space charge limited current (SCLC) and charge extraction (CELIV) measurements. Simple models, such as the Gaussian disorder model (GDM), are shown to accurately predict the temperature behavior, and a good correlation between the different measurement methods is obtained. Inconsistent charge carrier concentrations in the modeling are explained through intrinsic non-equilibrium effects, and are responsible for the limited applicability of existing numerical models. A severe extrinsic influence from water in FETs with a hydrophilic insulator interface is also demonstrated. The presence of water leads to a significant overestimate of the disorder in the materials from measurements close to room temperature and erratic behavior in the 150-350 K range. To circumvent this problem it is shown to be necessary to measure under ultra high vacuum (UHV) conditions. © 2008 Elsevier B.V. All rights reserved.
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