Structure development of bilayer PCDTBT and PCBM films

POSTER

Abstract

Poly[N-9"-hepta-decanyl-2,7-carbazole-alt- 5,5-(4',7'-di- 2-thienyl-2',1',3'-benzothiadiazole)] (PCDTBT) is a promising low band gap material. with power conversion efficiency approaching 6{\%} when blended with PCBM$_{\mathrm{70}}$. However, unlike the benchmark P3HT:PCBM system, annealing at high temperature results in performance reduction. To gain a deeper understanding of this material, bilayer films of crystalline PCDTBT and PCBM were prepared, and the kinetics associated with the structure development were investigated. It was found that the diffusion of PCBM disturbs the ordering of PCDTBT along (100) direction. A decrease in domain size was also observed by transmission electron microscopy..

Authors

  • Hsin-Wei Wang

    UMass Amherst

  • Thomas Russell

    University of Massachusetts Amherst, University of Massachusettes-Amherst, University of Massachusetts at Amherst, Polymer Science and Engineering Department, University of Massachusetts, University of Massachusetts - Amherst, UMass Amherst, Polymer Science and Engineering, University of Massachusetts-Amherst, University of Massachusetts, Amherst, Department of Polymer Science and Engineering, University of Massachusetts-Amherst

  • Todd Emrick

    UMass Amherst, University of Massachusetts Amherst