Effects of thermal annealing upon the nanomorphology of poly(3-hexylselenophene)-PCBM blends

Samuele Lilliu, Tiziano Agostinelli, Eric Verploegen, Ellis Pires, Mark Hampton, Mohammed Al-Hashimi, Martin J. Heeney, Michael F. Toney, Jenny Nelson, J. Emyr MacDonald

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15 Citations (Scopus)

Abstract

Grazing incidence X-ray diffraction (GI-XRD) is used to characterize the crystallographic dynamics of low molecular weight (LMW) and high molecular weight (HMW) poly(3-hexylselenophene) (P3HS) films and blend films of P3HS with [6-6-]-phenyl-C 61-butyric acid methyl ester (PCBM) as a function of 'step-by-step' thermal annealing, from room temperature to 250 °C. The temperature-dependent GIXRD data show how the melting point of P3HS crystallites is decreased by the presence of PCBM. P3HS crystallite domain sizes dramatically increase upon annealing to the P3HS melting temperature. The formation of well-oriented HMW P3HS crystallites with the (100) plane parallel to the substrate (edge-on orientation), when cooled from melt, are observed. We compare the behaviour of P3HS pure and blend films with that of poly(3-hexyl)thiophene (P3HT) pure and PCBM blended films and suggest that the similar temperature dependent behaviour we observe may be a common to polythiophene and related polymers and their blends. The crystallographic dynamics of low molecular weight (LMW) and high molecular weight (HMW) poly(3-hexylselenophene) (P3HS) and phenyl-C 61-butyric acid methyl ester (PCBM) film bulk heterojunction (BHJ) has been characterized by GI-XRD, during in situ 'step-by-step' thermal annealing from room temperature to 250°C.

Original languageEnglish
Pages (from-to)1454-1460
Number of pages7
JournalMacromolecular Rapid Communications
Volume32
Issue number18
DOIs
Publication statusPublished - 15 Sep 2011

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Keywords

  • conjugated polymers
  • crystallization
  • disorder
  • fullerenes
  • wide-angle X-ray scattering

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Cite this

Lilliu, S., Agostinelli, T., Verploegen, E., Pires, E., Hampton, M., Al-Hashimi, M., Heeney, M. J., Toney, M. F., Nelson, J., & MacDonald, J. E. (2011). Effects of thermal annealing upon the nanomorphology of poly(3-hexylselenophene)-PCBM blends. Macromolecular Rapid Communications, 32(18), 1454-1460. https://doi.org/10.1002/marc.201100330