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Träfflista för sökning "WFRF:(Zhang Fengling) srt2:(2011);pers:(Ma Zaifei)"

Sökning: WFRF:(Zhang Fengling) > (2011) > Ma Zaifei

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1.
  • Wang, Ergang, et al. (författare)
  • An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
  • 2011
  • Ingår i: Journal of the American Chemical Society. - 0002-7863. ; 133:36, s. 14244-14247
  • Tidskriftsartikel (refereegranskat)abstract
    • A new, low-band-gap alternating copolymer consisting of terthiophene and isoindigo has been designed and synthesized. Solar cells based on this polymer and PC(71)BM show a power conversion efficiency of 6.3%, which is a record for polymer solar cells based on a polymer with an optical band gap below 1.5 eV. This work demonstrates the great potential of isoindigo moieties as electron-deficient units for building donor-acceptor-type polymers for high-performance polymer solar cells.
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2.
  • Wang, Ergang, et al. (författare)
  • An isoindigo-based low band gap polymer for efficient polymer solar cells with high photo-voltage
  • 2011
  • Ingår i: Chemical Communications. - 1359-7345. ; 47:17, s. 4908-4910
  • Tidskriftsartikel (refereegranskat)abstract
    • A new low band gap polymer (E-g = 1.6 eV) with alternating thiophene and isoindigo units was synthesized and characterized. A PCE of 3.0% and high open-circuit voltage of 0.89 V were realized in polymer solar cells, which demonstrated the promise of isoindigo as an electron deficient unit in the design of donor-acceptor conjugated polymers for polymer solar cells.
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3.
  • Du, Chun, et al. (författare)
  • 9-Alkylidene-9H-Fluorene-Containing Polymer for High-Efficiency Polymer Solar Cells
  • 2011
  • Ingår i: Macromolecules. - American Chemical Society. - 0024-9297. ; 44:19, s. 7617-7624
  • Tidskriftsartikel (refereegranskat)abstract
    • A novel donor-acceptor copolymer containing 9-alkylidene-9H-fluorene unit in the main chain, poly[9-(1-hexylheptylidene)-2,7-fluorene-alt-5, 5-(4,7-di-2-thienyl-5,6-dialkoxy-2,1,3-benzothiadiazole)] (PAFDTBT), has been synthesized and evaluated in bulk heterojunction polymer solar cells (BHJ PSCs). The polymer possesses a low band gap of 1.84 eV, a low-lying HOMO energy level (5.32 eV), and excellent solubility in common organic solvents. PSCs based on PAFDTBT and (6,6)-phenyl-C(71)-butyric add methyl ester (PC(71)BM) demonstrate a power conversion efficiency (PCE) of 6.2% with a high fill factor (FF) of 0.70, which indicates that 9-alkylidene-9H-fluorene can be a very useful building block for constructing narrow band gap conjugated polymers for high-efficiency BHJ PSCs.
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4.
  • Ma, Zaifei, et al. (författare)
  • Enhance performance of organic solar cells based on an isoindigo-based copolymer by balancing absorption and miscibility of electron acceptor
  • 2011
  • Ingår i: Applied Physics Letters. - American Institute of Physics (AIP). - 0003-6951. ; 99:14, s. 143302
  • Tidskriftsartikel (refereegranskat)abstract
    • Superior absorption of PC(71)BM in visible region to that of PC(61)BM makes PC(71)BM a predominant acceptor for most high efficient polymer solar cells (PSCs). However, we will demonstrate that power conversion efficiencies (PCEs) of PSCs based on poly[N,N-bis(2-hexyldecyl)isoindigo-6, 6-diyl-alt-thiophene-2,5-diyl] (PTI-1) with PC(61)BM as acceptor are 50% higher than their PC71BM counterparts under illumination of AM1.5G. AFM images reveal different topographies of the blends between PTI-1:PC(61)BM and PTI-1:PC(71)BM, which suggests that acceptors miscibility plays a more important role than absorption. The photocurrent of 9.1 mA/cm(2) is among the highest value in PSCs with a driving force for exciton dissociation less than 0.2 eV.
5.
  • Wang, Ergang, et al. (författare)
  • Side-Chain Architectures of 2,7-Carbazole and Quinoxaline-Based Polymers for Efficient Polymer Solar Cells
  • 2011
  • Ingår i: Macromolecules. - 0024-9297. ; 44:7, s. 2067-2073
  • Tidskriftsartikel (refereegranskat)abstract
    • Three polymers bearing a common carbazole thiophene quinoxaline thiophene backbone, but different side chains, were designed and synthesized in order to investigate the effect of side chains on their photovoltaic performance. Their photophysical, electrochemical, and photovoltaic properties were investigated and compared. The polymer EWC3, with the largest amount of side chains, showed the highest power conversion efficiency of 3.7% with an open-circuit voltage (V-oc) of 0.92 V. The atomic force microscopy images of the active layers of the devices showed that the morphology was highly influenced by the choice of the solvent and processing additive. It is worth noting that polymer solar cells (PSCs) fabricated from EWC3, with branched side chains on the carbazole units, gave a much higher V-oc than the devices made from EWC1, which bears the same electron-deficient segment as EWC3 but straight side chains on carbazole units. This study offered a useful and important guideline for designing 2,7-carbazole-based polymers for high-performance PSCs.
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