SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WAKA:ref ;pers:(Inganäs Olle);srt2:(2010-2011)"

Sökning: WAKA:ref > Inganäs Olle > (2010-2011)

  • Resultat 31-40 av 42
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
31.
  • Vandewal, Koen, et al. (författare)
  • Charge Transfer States in Organic Donor-Acceptor Solar Cells
  • 2011
  • Ingår i: Semiconductors and semimetals. - : Academic Press. - 0080-8784. ; 85, s. 261-295
  • Tidskriftsartikel (refereegranskat)abstract
    • For an efficient conversion of photons to electrons by organic materials used for photovoltaic applications, the presence of a material interface between an electron-donating and electron-accepting material is crucial. This chapter deals with the interfacial charge transfer states formed at such interfaces under solar illumination. Absorption of long-wavelength light, with energy lower than the optical gap of both donor and acceptor results in the direct formation of these charge transfer states. Decay of CT states to the ground state will result in weak light emission. Both CT absorption and emission will be linked to photovoltaic performance. The role of the CT state in determining the open-circuit voltage is discussed in detail. We will also elaborate on the efficiency of dissociation and photocurrent generation from thermally relaxed CT states. Based on thermodynamical considerations and in the absence of nonradiative recombination, upper limits for the efficiency of organic solar cells based on donor–acceptor interfaces are derived and possible improvements and future research directions are indicated.
  •  
32.
  • Vandewal, Koen, et al. (författare)
  • Relating the open-circuit voltage to interface molecular properties of donor:acceptor bulk heterojunction solar cells
  • 2010
  • Ingår i: PHYSICAL REVIEW B. - : American Physical Society. - 1098-0121. ; 81:12, s. 125204-
  • Tidskriftsartikel (refereegranskat)abstract
    • The open-circuit voltage (V-oc) of polymer:fullerene bulk heterojunction solar cells is determined by the interfacial charge-transfer (CT) states between polymer and fullerene. Fourier-transform photocurrent spectroscopy and electroluminescence spectra of several polymer:fullerene blends are used to extract the relevant interfacial molecular parameters. An analytical expression linking these properties to V-oc is deduced and shown to be valid for photovoltaic devices comprising three commonly used conjugated polymers blended with the fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). V-oc is proportional to the energy of the CT states E-CT. The energetic loss q Delta V between E-CT and qV(oc) vanishes when approaching 0 K. It depends linearly on T and logarithmically on illumination intensity. Furthermore q Delta V can be reduced by decreasing the electronic coupling between polymer and fullerene or by reducing the nonradiative recombination rate. For the investigated devices we find a loss q Delta V of similar to 0.6 eV at room temperature and under solar illumination conditions, of which similar to 0.25 eV is due to radiative recombination via the CT state and similar to 0.35 eV is due to nonradiative recombination.
  •  
33.
  • Wang, Ergang, 1981, et al. (författare)
  • An Easily Accessible Isoindigo-Based Polymer for High-Performance Polymer Solar Cells
  • 2011
  • Ingår i: Journal of the American Chemical Society. - : American Chemical Society (ACS). - 1520-5126 .- 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.
  •  
34.
  • Wang, Ergang, 1981, et al. (författare)
  • An Easily Synthesized Blue Polymer for High-Performance Polymer Solar Cells
  • 2010
  • Ingår i: ADVANCED MATERIALS. - : John Wiley and Sons, Ltd. - 0935-9648 .- 1521-4095. ; 22:46, s. 5240-5244
  • Tidskriftsartikel (refereegranskat)abstract
    • High performance solar cells fabricated from an easily synthesized donor-acceptor polymer show maximum power point up to 6.0 mW cm(-2), with an open-circuit voltage of 0.89 V, short-circuit current density of 10.5 mA cm(-2) and fill factor of 0.64, making this polymer a particularly promising candidate for high-efficiency low-cost polymer solar cells.
  •  
35.
  • Wang, Ergang, 1981, et al. (författare)
  • An isoindigo-based low band gap polymer for efficient polymer solar cells with high photo-voltage
  • 2011
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1364-548X .- 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.
  •  
36.
  • Wang, Ergang, 1981, et al. (författare)
  • Side-Chain Architectures of 2,7-Carbazole and Quinoxaline-Based Polymers for Efficient Polymer Solar Cells
  • 2011
  • Ingår i: Macromolecules. - : American Chemical Society (ACS). - 1520-5835 .- 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.
  •  
37.
  • Wang, Ergang, 1981, et al. (författare)
  • Small Band Gap Polymers Synthesized via a Modified Nitration of 4,7-Dibromo-2,1,3-benzothiadiazole
  • 2010
  • Ingår i: Organic Letters. - : American Chemical Society (ACS). - 1523-7052 .- 1523-7060. ; 12:20, s. 4470-4473
  • Tidskriftsartikel (refereegranskat)abstract
    • The nitration of 4,7-dibromo-2,1,3-benzothiadiazole was modified by using CF3SO3H and HNO3 as the nitrating agent, and the related yield was improved greatly. On the basis of this improvement, two new small band gap polymers, P1TPQ and P3TPQ, were developed. Bulk heterojunction solar cells based on P3TPO and [6,6]-phenyl-C-71-butyric acid methyl ester exhibit interesting results with a power conversion efficiency of 21% and photoresponse up to 1.1 mu m
  •  
38.
  • Wang, Zhongqiang, et al. (författare)
  • Mixed solvents for reproducible photovoltaic bulk heterojunctions
  • 2011
  • Ingår i: Journal of Photonics for Energy. - : SPIE-Intl Soc Optical Eng. - 1947-7988. ; 1:1 (Special Section on Organic Photovoltaics), s. 011122-
  • Tidskriftsartikel (refereegranskat)abstract
    • Most efficient polymer solar cells are usually fabricated from toxic organic solvents, such as chloroform, chlorobenzene, or dichlorobenzene (ODCB). Here, we demonstrate a power conversion efficiency of 4.5% in solar cells with a new blue polymer poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1) mixed with PC71BM and processed from mixed solvents of toluene and ODCB in a ratio of 9:1. Decreasing the content of ODCB makes device processing more compatible with the environment for large scale production, with 10% reduction of photocurrent compared to devices from pure ODCB under optimized conditions. In addition, less variation of photocurrent is obtained in solar cells processed from mixed solvents than from pure ODCB due to varying nanostructure in the blends, which is also critical for production.
  •  
39.
  • Wigenius, Jens A., 1975-, et al. (författare)
  • Interactions Between a Luminescent Conjugated Oligoelectrolyte and Insulin During Early Phases of Amyloid Formation
  • 2011
  • Ingår i: Macromolecular Bioscience. - : Wiley. - 1616-5187 .- 1616-5195. ; 11:8, s. 1120-1127
  • Tidskriftsartikel (refereegranskat)abstract
    • Aggregates of misfolded proteins play an important role in diseases such as Alzheimer's. Here it is demonstrated how the anionic oligothiophene p-FTAA interacts with and influences pre-fibrillar protein assemblies during the earlier stages of in vitro fibrillation. Conjugated polythiophenes have previously been demonstrated to detect and discriminate between different types of protein aggregates and also introduce luminescent or conductive properties to these nanoscale fiber structures. Fluorescence spectroscopy, DLS, TEM and FCS are employed to follow the interplay between p-FTAA and insulin during in vitro fibrillation.
  •  
40.
  • Wigenius, Jens, et al. (författare)
  • DNA Chips with Conjugated Polyelectrolytes in Resonance Energy Transfer Mode
  • 2010
  • Ingår i: LANGMUIR. - : American Chemical Society (ACS). - 0743-7463 .- 1520-5827. ; 26:5, s. 3753-3759
  • Tidskriftsartikel (refereegranskat)abstract
    • We show how to use well-defined conjugated polyelectrolytes (CPEs) combined With Surface energy patterning to Fabricate DNA Chips utilizing A fluorescence signal amplification. Cholesterol-modified DNA strands in complex with it CPE are adsorbed to a surface energy pattern, formed by printing with soft elastomer stamps. Hybridization of the surface bound DNA strands with it short complementary strand from Solution is monitored using both fluorescence microscopy and imaging surface plasmon resonance. The CPEs act as antennas, enhancing resonance energy transfer to the dye-labeled DNA when complementary hybridization of the double strand occurs.
  •  
Skapa referenser, mejla, bekava och länka
  • Resultat 31-40 av 42
Typ av publikation
tidskriftsartikel (39)
forskningsöversikt (2)
annan publikation (1)
Typ av innehåll
refereegranskat (42)
Författare/redaktör
Zhang, Fengling (19)
Andersson, Mats, 196 ... (15)
Wang, Ergang, 1981 (9)
Muller, Christian (7)
Vandewal, Koen (7)
visa fler...
Zhou, Yi (6)
Andersson, Mattias (5)
Solin, Niclas (3)
Andersson, Viktor (3)
Hamedi, Mahiar (3)
Ma, Zaifei (3)
Mammo, Wendimagegn, ... (2)
Björk, Per (2)
Arwin, Hans (2)
Li, Yongfang (2)
Lindgren, Lars Johan ... (2)
Wuerfel, Uli (2)
Asplund, Maria (2)
Nyberg, Tobias (2)
Pal, S. K. (1)
von Holst, Hans (1)
Pascher, Torbjörn (1)
Sundström, Villy (1)
Lu, Jun (1)
Rising, Anna (1)
Johansson, Jan (1)
Österman, Tomas (1)
Yartsev, Arkady (1)
Schubert, Mathias (1)
Zhang, Bo (1)
Elfwing, Anders (1)
Edman, Ludvig, 1967- (1)
Andersson, L. M. (1)
Magnusson, Roger (1)
Mueller, Christian (1)
Marcilla, Rebeca (1)
Widengren, Jerker (1)
Andersson, Olof (1)
Hauch, Jens (1)
Min, Jie (1)
Hoppe, Harald (1)
Badada, Bekele H (1)
Wuerful, Uli (1)
Herland, Anna (1)
Anselmo, Ana Sofia, ... (1)
Moons, Ellen, 1966- (1)
Hofmann, Tino (1)
Sandström, Andreas (1)
Askarieh, Glareh (1)
visa färre...
Lärosäte
Linköpings universitet (40)
Chalmers tekniska högskola (15)
Kungliga Tekniska Högskolan (6)
Umeå universitet (1)
Lunds universitet (1)
Karlstads universitet (1)
visa fler...
Karolinska Institutet (1)
visa färre...
Språk
Engelska (42)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (20)
Teknik (4)

År

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy