Influence of indium tin oxide surface treatment on spatially localized photocurrent variations in bulk heterojunction organic photovoltaic devices

Benjamin J. Leever, Ian P. Murray, Michael F. Durstock, Tobin J. Marks, Mark C. Hersam

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

A correlation between anode surface treatment and spatially localized photocurrent variations has been found in bulk heterojunction poly(3-hexylthiophene):[6,6]-phenyl-C-61-butyric acid methyl ester (P3HT:PCBM) organic photovoltaic (OPV) devices. Atomic force photovoltaic microscopy was used to scan arrays of 2 μm diameter OPV devices with varied indium tin oxide (ITO) surface treatments. The standard deviation of the average photocurrent was found to be 11.4% for devices fabricated on untreated ITO, 8.6% for devices with a poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) interlayer, and 6.7% for devices with a HCl-treated ITO surface. These results suggest that spatial variations in the structure and electronic properties of the anode surface degrade the overall performance of OPVs, including reductions in short-circuit current by up to 20%, thus highlighting the importance of surface treatments that improve the homogeneity of ITO.

Original languageEnglish
Pages (from-to)22688-22694
Number of pages7
JournalJournal of Physical Chemistry C
Volume115
Issue number45
DOIs
Publication statusPublished - Nov 17 2011

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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