Controlling the morphology of nanofiber-P3HT:PCBM blends for organic bulk heterojunction solar cells

Sabine Bertho*, Wibren D. Oosterbaan, Veerle Vrindts, Jan D'Haen, Thomas J. Cleij, Laurence Lutsen, Jean V. Manca, Dirk Vanderzande

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Within the field of organic bulk heterojunction solar cells, the morphology of the active layer has a key role in obtaining high power conversion efficiencies. P3ht nanofibers, obtained in highly concentrated solutions, are able to give controlled morphologies directly upon deposition. Since the solar cell efficiency of fiber solar cells depends on the fiber content of the casting solution, it is important to control this parameter. Here, we demonstrate an easy way to control the fiber content in the casting solution, i.e. Changing the solution temperature. By using solution heating, the overall molecular weight of the polymer in the blend is kept constant, fiber isolation is not needed and the use of solvent mixtures is avoided. The obtained optimal power conversion efficiency is shown to be linked to the morphology of the active layer, which is studied with transmission electron microscopy (tem).
Original languageEnglish
Pages (from-to)1248-1251
JournalOrganic Electronics
Volume10
Issue number7
DOIs
Publication statusPublished - Nov 2009
Externally publishedYes

Keywords

  • Organic solar cells
  • Nanofibers
  • Transmission electron microscopy

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