Amorphous silicon/polyaniline heterojunction solar cells: Fermi levels and open-circuit voltages

Weining Wang, Eric Schiff, Qi Wang

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


We fabricated hydrogenated amorphous silicon/polyaniline n-i-p heterojunction solar cells incorporating a doped, hole conducting polyaniline (PANI) layer. The cells were prepared by spin-casting differing polyaniline dispersions corresponding to film conductivities ranging from 10-2 to 102 S/m. The open-circuit voltages VOC of the cells ranged from 0.5-0.7 V. While these open-circuit voltages are lower than for the best a-Si:H cells utilizing nanocrystalline Si or a-SiC:H p-layers, they illustrate well how open-circuit voltages are limited by the work function of the contacting material. They also give insight into the mechanism limiting VOC for crystal silicon/PANI n/p solar cells, for which VOC varies little for PANI conductivities greater than 10-1 S/cm. The comparison excludes electrophoresis effects in the PANI as the limiting mechanism.

Original languageEnglish (US)
Pages (from-to)2862-2865
Number of pages4
JournalJournal of Non-Crystalline Solids
Issue number19-25
StatePublished - May 1 2008


  • Solar cells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry


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