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Sökning: WAKA:ref > Inganäs Olle > Andersson Mats > Andersson Mattias > Engelska

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1.
  • Andersson, Mattias, et al. (författare)
  • Mixed C60/C70 based fullerene acceptors in polymer bulk-heterojunction solar cells
  • 2012
  • Ingår i: Organic electronics. - Elsevier. - 1566-1199. ; 13:12, s. 2856-2864
  • Tidskriftsartikel (refereegranskat)abstract
    • Different mixtures of identically substituted C60 and C70 based fullerens have been used as acceptors in three polymer: fullerene systems that strongly express various performance limiting aspects of bulk heterojunction solar cells. Results are correlated with, and discussed in terms of e.g. morphology, charge separation, and charge transport. In these systems, there appears to be no relevant differences in either mobility or energy level positions between the identically substituted C60 and C70 based fullerenes tested. Examples of how fullerene mixtures influence the nano-morphology of the active layer are given. An upper limit to the open circuit voltage that can be obtained with fullerenes is also suggested.
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2.
  • Chen, Miaoxiang, 1962-, et al. (författare)
  • High carrier mobility in low band gap polymer-based field-effect transistors
  • 2005
  • Ingår i: Applied Physics Letters. - 0003-6951. ; 87:25, s. 252105-1-252105-3
  • Tidskriftsartikel (refereegranskat)abstract
    • A conjugated polymer with a low band gap of 1.21 eV, i.e., absorbing infrared light, is demonstrated as active material in field-effect transistors (FETs). The material consists of alternating fluorene units and low band gap segments with electron donor-acceptor-donor units composed of two electron-donating thiophene rings attached on both sides of a thiadiazolo-quinoxaline electron-acceptor group. The polymer is solution-processable and air-stable; the resulting FETs exhibit typical p-channel characteristics and field-effect mobility of 0.03 cm2 V−1 s−1.
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4.
  • Inganäs, Olle, et al. (författare)
  • Polymer Photovoltaics with Alternating Copolymer/Fullerene Blends and Novel Device Architectures
  • 2010
  • Ingår i: Advanced Materials. - 0935-9648. ; 22:20, s. 100-116
  • Tidskriftsartikel (refereegranskat)abstract
    • The synthesis of novel conjugated polymers, designed for the purpose of photovoltaic energy conversion, and their properties in polymer/fullerene materials and photovoltaic devices are reviewed. Two families of main chain polymer donors, based on fluorene or phenylene and donor-acceptor-donor comonomers in alternating copolymers, are used to absorb the high-energy parts of the solar spectrum and to give high photovoltages in combinations with fullerene acceptors in devices. These materials are used in alternative photovoltaic device geometries with enhanced light incoupling to collect larger photocurrents or to enable tandem devices and enhance photovoltage.
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5.
  • J Lindgren, Lars, et al. (författare)
  • Synthesis, Characterization, and Devices of a Series of Alternating Copolymers for Solar Cells
  • 2009
  • Ingår i: CHEMISTRY OF MATERIALS. - 0897-4756. ; 21:15, s. 3491-3502
  • Tidskriftsartikel (refereegranskat)abstract
    • In this study we report the synthesis, characterization. and photovoltaic properties of a series of six Conjugated polymers based on donor-acceptor-donor (DAD) structure. The polymers are obtained via Suzuki polymerization of different alkoxy-substituted DAD monomers together with a substituted fluorene or phenylene monomer. Application of polymers as light-harvesting and electron-donating materials in solar cells, in conjunction with both [60]PCBM and [70]PCBM as acceptors, show power-conversion efficiencies (PCEs) up to 2.9%, values obtained without extensive optimization work. Furthermore, atomic force microscopy and field-effect transistor (FET) mobility measurements of acceptor-polymer mixtures show that differences in substitution on the polymers affect morphology, mobility, and device performance. Within the series of polymers, all showing similar optical absorption and redox behavior, substituents play an important role in phase separation on a micrometer scale, which in turn has a large impact on device performance. The phase-separation behavior is clearly seen in [70]PCBM devices where the best-performing devices are obtained using the polymers with short alkoxy groups or no substituents together with a high speed of spin coating during device preparation.
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6.
  • Müller, Christian, et al. (författare)
  • Influence of Molecular Weight on the Performance of Organic Solar Cells Based on a Fluorene Derivative
  • 2010
  • Ingår i: Advanced Functional Materials. - 1616-301X. ; 20:13, s. 2124-2131
  • Tidskriftsartikel (refereegranskat)abstract
    • The performance of organic photovoltaic (OPV) bulk-heterojunction blends comprising a liquid-crystalline fluorene derivative and a small-molecular fullerene is found to increase asymptotically with the degree of polymerization of the former. Similar to various thermodynamic transition temperatures as well as the light absorbance of the fluorene moiety, the photocurrent extracted from OPV devices is found to strongly vary with increasing oligomer size up to a number average molecular weight, M-n approximate to 10 kg mol(-1), but is rendered less chain-length dependent for higher M-n as the fluorene derivative gradually adopts polymeric behavior.
7.
  • Tang, Zheng, et al. (författare)
  • Interlayer for Modified Cathode in Highly Efficient Inverted ITO-Free Organic Solar Cells
  • 2012
  • Ingår i: Advanced Materials. - 0935-9648. ; 24:4, s. 554
  • Tidskriftsartikel (refereegranskat)abstract
    • Inverted polymer solar cells with a bottom metal cathode modified by a conjugated polymer interlayer show considerable improvement of photocurrent and fill factor, which is due to hole blocking at the interlayer, and a modified surface energy which affects the nanostructure in the TQ1/[70]PCBM blend.
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8.
  • Tang, Zheng, et al. (författare)
  • Semi-Transparent Tandem Organic Solar Cells with 90% Internal Quantum Efficiency
  • 2012
  • Ingår i: ADVANCED ENERGY MATERIALS. - Wiley-VCH Verlag Berlin. - 1614-6832. ; 2:12, s. 1467-1476
  • Tidskriftsartikel (refereegranskat)abstract
    • Semi-transparent (ST) organic solar cells with potential application as power generating windows are studied. The main challenge is to find proper transparent electrodes with desired electrical and optical properties. In this work, this is addressed by employing an amphiphilic conjugated polymer PFPA-1 modified ITO coated glass substrate as the ohmic electron-collecting cathode and PEDOT:PSS PH1000 as the hole-collecting anode. For active layers based on different donor polymers, considerably lower reflection and parasitic absorption are found in the ST solar cells as compared to solar cells in the standard geometry with an ITO/PEDOT:PSS anode and a LiF/Al cathode. The ST solar cells have remarkably high internal quantum efficiency at short circuit condition (similar to 90%) and high transmittance (similar to 50%). Hence, efficient ST tandem solar cells with enhanced power conversion efficiency (PCE) compared to a single ST solar cell can be constructed by connecting the stacked two ST sub-cells in parallel. The total loss of photons by reflection, parasitic absorption and transmission in the ST tandem solar cell can be smaller than the loss in a standard solar cell based on the same active materials. We demonstrate this by stacking five separately prepared ST cells on top of each other, to obtain a higher photocurrent than in an optimized standard solar cell.
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9.
  • Zhang, Fengling, 1960-, et al. (författare)
  • Low-Bandgap Alternating Fluorene Copolymer/Methanofullerene Heterojunctions in Efficient Near-Infrared Polymer Solar Cells
  • 2006
  • Ingår i: Advanced Materials. - 0935-9648. ; 18, s. 2169-2173
  • Tidskriftsartikel (refereegranskat)abstract
    • Efficient near-IR polymer solar cells based on the low-bandgap alternating fluorene copolymer APFO-Green 5 exhibit a photoresponse up to 800 nm. The copolymer performs well in combination with the common electron acceptor [6,6]-phenyl-C61-butyric acid Me ester (PCBM), reaching a power-conversion efficiency of 2.2% with a lower PCBM content in the active layer than previous devices based on low-bandgap polymers. [on SciFinder (R)]
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  • Resultat 1-9 av 9
 
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