Optimal negative electrodes for poly(3-hexylthiophene): [6,6]-phenyl C61-butyric acid methyl ester bulk heterojunction photovoltaic devices

Matthew O. Reese, Matthew S. White, Garry Rumbles, David S. Ginley, Sean E. Shaheen

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The role of the work function and interfacial chemistry on organic device performance was investigated by using a series of contact materials. The active layer was a standard blend of poly(3-hexylthiophene) and [6-6]-phenyl C61-butyric acid methyl ester. Over 100 devices were fabricated and measured to obtain good statistics. BaAl and CaAl electrodes performed best, with similar open-circuit voltages and power conversion efficiencies. Device stability studies showed devices with these two electrodes remained similar after six weeks with degradation of 11%-16% in net conversion efficiency observed. The incorporation of silver into the electrodes led to considerably more degradation than other electrode types.

Original languageEnglish
Article number053307
JournalApplied Physics Letters
Issue number5
Publication statusPublished - Feb 15 2008


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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