The effect of poly(3-hexylthiophene) molecular weight on charge transport and the performance of polymer: Fullerene solar cells

Amy M. Ballantyne, Lichun Chen, Justin Dane, Thomas Hammant, Felix M. Braun, Martin Heeney, Warren Duffy, Iain McCulloch, Donal D.C. Bradley, Jenny Nelson

Research output: Contribution to journalArticlepeer-review

229 Scopus citations

Abstract

The time-of-flight method has been used to study the effect of P3HT molecular weight (Mn = 13-121 kDa) on charge mobility in pristine and PCBM blend films using highly regioregular P3HT. Hole mobility was observed to remain constant at 10-4cm2V-1 s-1 as molecular weight was increased from 13-18 kDa, but then decreased by one order of magnitude as molecular weight was further increased from 34-121 kDa. The decrease in charge mobility observed in blend films is accompanied by a change in surface morphology, and leads to a decrease in the performance of photovoltaic devices made from these blend films.

Original languageEnglish (US)
Pages (from-to)2373-2380
Number of pages8
JournalAdvanced Functional Materials
Volume18
Issue number16
DOIs
StatePublished - Aug 22 2008
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Condensed Matter Physics
  • Electrochemistry

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