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Morphological Characterization of a Low-Bandgap Crystalline Polymer:PCBM Bulk Heterojunction Solar Cells

Lu, Haiyun ; Akgun, Bulent ; Russell, Thomas P.

Advanced Energy Materials, 2011-10, Vol.1 (5), p.870-878 [Periódico revisado por pares]

Weinheim: WILEY-VCH Verlag

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  • Título:
    Morphological Characterization of a Low-Bandgap Crystalline Polymer:PCBM Bulk Heterojunction Solar Cells
  • Autor: Lu, Haiyun ; Akgun, Bulent ; Russell, Thomas P.
  • Assuntos: Annealing ; bulk heterojunctions ; Cathodes ; characterization ; Devices ; Morphology ; organic photovoltaics ; organic solar cells ; Photovoltaic cells ; Polymer blends ; Radioactivity ; scattering ; Segregations ; solar (photovoltaic), charge transport, materials and chemistry by design, synthesis (novel materials), synthesis (self-assembly) ; Solar cells ; SOLAR ENERGY ; X-rays
  • É parte de: Advanced Energy Materials, 2011-10, Vol.1 (5), p.870-878
  • Notas: ark:/67375/WNG-Q4TSFB0X-G
    ArticleID:AENM201100128
    istex:484A2F9AF35455109A366D459E72684489D4C285
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
    SC0001087
  • Descrição: Understanding the morphology of polymer‐based bulk heterojunction (BHJ) solar cells is necessary to improve device efficiencies. Blends of a low‐bandgap silole‐containing conjugated polymer, poly[(4,4′‐bis(2‐ethylhexyl)dithieno[3,2‐b;2′,3′‐d]silole)‐2,6‐diyl‐alt‐(4,7‐bis(2‐thienyl)‐2,1,3‐benzothiadiazole)‐5,5′‐diyl] (PSBTBT) with [6,6]phenyl‐C61‐butyric acid methyl ester (PCBM) were investigated under different processing conditions. The surface morphologies and vertical segregation of the “As‐Spun”, “Pre‐Annealed”, and “Post‐Annealed” films were studied by scanning force microscopy, contact angle measurements, X‐ray photoelectron spectroscopy, near‐edge X‐ray absorption fine structure spectroscopy, dynamic secondary ion mass spectrometry, and neutron reflectivity. The results showed that PSBTBT was enriched at the cathode interface in the “As‐Spun” films and thermal annealing increased the segregation of PSBTBT to the free surface, while thermal annealing after deposition of the cathode increased the PCBM concentration at the cathode interface. Grazing‐incidence X‐ray diffraction and small‐angle neutron scattering showed that the crystallization of PSBTBT and segregation of PCBM occurred during spin coating, and thermal annealing increased the ordering of PSBTBT and enhanced the segregation of the PCBM, forming domains ∼10 nm in size, leading to an improvement in photovoltaic performance. A detailed description of morphology is presented for blend films of a low‐bandgap silole‐containing conjugated polymer, poly[(4,4′bis(2‐ethylhexyl)dithieno[3,2‐b;2′ 3′‐d]silole)‐2,6‐diyl‐alt‐(4,7‐bis(2‐thienyl)‐2,1,3‐benzothiadiazole)‐5,5′‐diyl] (PSBTBT) with [6,6]phenyl‐C61‐butyric acid methyl ester (PCBM). Versatile techniques were used to characterize the morphology of the “As‐Spun”, “Pre‐Annealed”, and “Post‐Annealed” thin films, mimicking the real solar cell devices, and to provide insight into the performance of these mixtures in actual devices.
  • Editor: Weinheim: WILEY-VCH Verlag
  • Idioma: Inglês
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