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  • 1.
    Feng, Shizhen
    et al.
    South China University of Technology, Peoples R China.
    Liu, Chang
    South China University of Technology, Peoples R China.
    Xu, Xiaofeng
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Chalmers University of Technology, Sweden.
    Liu, Xuncheng
    South China University of Technology, Peoples R China.
    Zhang, Lianjie
    South China University of Technology, Peoples R China.
    Nian, Yaowen
    South China University of Technology, Peoples R China.
    Cao, Yong
    South China University of Technology, Peoples R China.
    Chen, Junwu
    South China University of Technology, Peoples R China.
    Siloxane-Terminated Side Chain Engineering of Acceptor Polymers Leading to Over 7% Power Conversion Efficiencies in All-Polymer Solar Cells2017In: ACS Macro Letters, E-ISSN 2161-1653, Vol. 6, no 11, p. 1310-1314Article in journal (Refereed)
    Abstract [en]

    To investigate the influence of functional pendent groups on acceptor polymers and photovoltaic properties of all-polymer solar cells (all-PSCs), two novel acceptor polymers containing siloxane-terminated side chains are synthesized and characterized. Increasing the content of siloxane-terminated side chains can reduce pi-pi stacking distance and improve crystalline behavior, yet lead to poorer solubility of the acceptor polymers. By modulating the proper loadings of siloxane-terminated side chains on the acceptor polymers, the PBDB-T:PNDI-Si25 all-PSC attains a maximal power conversion efficiency (PCE) of 7.4% with an outstanding fill factor of 0.68. The results provide, new insights for developing high-performance all-PSCs through functional group engineering on the acceptor polymers, to achieve good solubility, polymer miscibility, and blend morphology.

  • 2.
    Hynynen, Jonna
    et al.
    Chalmers Univ Technol, Sweden.
    Jarsvall, Emmy
    Chalmers Univ Technol, Sweden.
    Kroon, Renee
    Chalmers Univ Technol, Sweden.
    Zhang, Yadong
    Georgia Inst Technol, GA 30332 USA; Georgia Inst Technol, GA 30332 USA.
    Barlow, Stephen
    Georgia Inst Technol, GA 30332 USA; Georgia Inst Technol, GA 30332 USA.
    Marder, Seth R.
    Georgia Inst Technol, GA 30332 USA; Georgia Inst Technol, GA 30332 USA.
    Kemerink, Martijn
    Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, Faculty of Science & Engineering.
    Lund, Anja
    Chalmers Univ Technol, Sweden.
    Mueller, Christian
    Chalmers Univ Technol, Sweden.
    Enhanced Thermoelectric Power Factor of Tensile Drawn Poly(3-hexylthiophene)2019In: ACS Macro Letters, E-ISSN 2161-1653, Vol. 8, no 1, p. 70-76Article in journal (Refereed)
    Abstract [en]

    The thermoelectric power factor of a broad range of organic semiconductors scales with their electrical conductivity according to a widely obeyed power law, and therefore, strategies that permit this empirical trend to be surpassed are highly sought after. Here, tensile drawing of the conjugated polymer poly(3-hexylthiophene) (P3HT) is employed to create free-standing films with a high degree of uniaxial alignment. Along the direction of orientation, sequential doping with a molybdenum tris(dithiolene) complex leads to a 5-fold enhancement of the power factor beyond the predicted value, reaching up to 16 mu W m(-1) K-2 for a conductivity of about 13 S cm(-1). Neither stretching nor doping affect the glass transition temperature of P3HT, giving rise to robust free-standing materials that are of interest for the design of flexible thermoelectric devices.

    The full text will be freely available from 2019-12-26 10:21
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