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

Sökning: WAKA:ref > Inganäs Olle > (2010-2011) > Zhou Yi > Tvingstedt Kristofer

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1.
  • Li, Weiwei, et al. (författare)
  • The Effect of additive on performance and shelf-stability of HSX-1/PCBM photovoltaic devices
  • 2011
  • Ingår i: Organic electronics. - : Elsevier Science B.V., Amsterdam.. - 1566-1199 .- 1878-5530. ; 12:9, s. 1544-1551
  • Tidskriftsartikel (refereegranskat)abstract
    • How 1,8-diiodooctane (DIO) enhances performance of polymer solar cells based on polymer HXS-1 and fullerene [6,6]-phenyl C(71)-butyric acid methyl ester (PC(71)BM) from 3.6% to 5.4% is scrutinized with several techniques by comparing devices or blend films spin-coated from dichlorobenzene (DCB) to those from DCB/DIO (97.5:2.5 v/v). Morphology of blend films is examined with atomic force microscopy (AFM), transmission electron microscopy (TEM) and electron tomography (3-D TEM), respectively. Charge generation and recombination is studied with photoluminescence, and charge transport with field effect transistors. The morphology with domain size in 10-20 nm and vertical elongated clusters formed in DIO system is supposed to facilitate charge transport and minimize charge carrier recombination, which are the main reasons for enhancing power conversion efficiency (PCE) from 3.6% (without DIO) to 5.4% (with DIO). Furthermore, a two year inspection shows no significant impact of DIO on the shelf-stability of the solar cells. No visible degradation in the second year indicates that the morphology of the active layers in the devices is relatively stable after initial relaxation in the first year.
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2.
  • 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 Materials for Optics and Electronics. - : Wiley. - 1616-301X .- 1616-3028. ; 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.
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