Influence of a ternary donor material on the morphology of a P3HT:PCBM blend for organic photovoltaic devices

F. MacHui, S. Rathgeber, N. Li, T. Ameri, C.J. Brabec

Research output: Contribution to journalArticlepeer-review

Abstract

A comparison of grazing incidence wide-angle X-ray scattering (GiWAXS) and differential scanning calorimetric measurements (DSC) was used to identify the influence of a dominantly amorphous small band gap polymer material poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]dithiophene) -alt-4,7(2,1,3-benzothiadiazole)] (PCPDTBT) on the crystallinity of a semi-crystalline polymer/fullerene composite. In binary blends the low band gap polymer does not influence the crystalline part of P3HT, but does influence the crystallinity of the fullerene. In ternary blends, a significant drop of the PCBM crystallinity is observed with increasing PCPDTBT content. Adding more than 20 wt% PCPDTBT to a P3HT:PCBM blend leads to a dramatic reduction of device efficiency, mainly due to short circuit current density and fill factor losses. This deterioration is attributed to the fact that addition of more than 20 wt% PCPDTBT to the host system strongly reduces crystallinity of the fullerene phase and electron transport in the ternary system. © 2012 The Royal Society of Chemistry.
Original languageEnglish
Pages (from-to)15570-15577
Number of pages8
JournalJournal of Materials Chemistry
Volume22
Issue number31
DOIs
Publication statusPublished - 2012

Keywords

  • 2
  • 1
  • 3-Benzothiadiazole
  • Binary blends
  • Crystallinities
  • Device efficiency
  • Differential scanning calorimetric measurements
  • Electron transport
  • Fill factor
  • Grazing incidence
  • Low bandgap polymers
  • Organic photovoltaic devices
  • Semi-crystalline polymer
  • Small band gap polymer
  • Ternary blends
  • Wide angle X-ray scattering
  • Crystalline materials
  • Energy gap
  • Fullerenes
  • Polymer blends
  • Polymers

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