Solution-processed small molecule:fullerene bulk-heterojunction solar cells: Impedance spectroscopy deduced bulk and interfacial limits to fill-factors

Antonio Guerrero, Stephen Loser, Germà Garcia-Belmonte, Carson J. Bruns, Jeremy Smith, Hiroyuki Miyauchi, Samuel I. Stupp, Juan Bisquert*, Tobin J. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Using impedance spectroscopy, we demonstrate that the low fill factor (FF) typically observed in small molecule solar cells is due to hindered carrier transport through the active layer and hindered charge transfer through the anode interfacial layer (IFL). By carefully tuning the active layer thickness and anode IFL in BDT(TDPP)2 solar cells, the FF is increased from 33 to 55% and the PCE from 1.9 to 3.8%. These results underscore the importance of simultaneously optimizing active layer thickness and IFL in small molecule solar cells.

Original languageEnglish (US)
Pages (from-to)16456-16462
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number39
DOIs
StatePublished - Oct 21 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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