Correlation between surface photovoltage and blend morphology in polyfluorene-based photodiodes

Marco Chiesa, Lukas Burgi, Ji Seon Kim, Rafi Shikler, Richard H. Friend, Henning Sirringhaus

Research output: Contribution to journalArticlepeer-review

159 Scopus citations


We present a microscopic study of photoinduced charge generation in polyfluorene-based photovoltaic structures. The sub-100 nm lateral resolution of scanning Kelvin probe microscopy allows characterizing the three-dimensional structure of thin films of blends of poly-(9,9'-dioctylfluorene-co- benzothiadiazole) (F8BT) and poly-(9,9'-dioctylfluorene-co-bis-N,N'-(4- butylphenyl)-bis-N,N-phenyl-1,4-phenylenediamine) (PFB). From the strong correlation between surface photovoltage and blend morphology, we propose a simple model for the lateral and vertical film structure identifying in particular those regions with the most efficient conduction pathway for the photocurrent.

Original languageEnglish
Pages (from-to)559-563
Number of pages5
JournalNano Letters
Issue number4
StatePublished - 1 Apr 2005
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering


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