The effects of copper phthalocyanine purity on organic solar cell performance

Rhonda F. Salzman, Jiangeng Xue, Barry P. Rand, Alex Alexander, Mark E. Thompson, Stephen R. Forrest

Research output: Contribution to journalArticlepeer-review

129 Scopus citations


The performance of small-molecular weight organic double heterojunction donor-acceptor bilayer solar cells is studied as a function of the purity of the donor material, copper phthalocyanine (CuPc). We find that the power conversion efficiency under simulated AM1.5G, 1 sun illumination conditions increases from (0.26 ± 0.01)% to (1.4 ± 0.1)% as the CuPc layer purity increases. Concomitant with the improvements in power conversion efficiency, we find that the hole mobility of the unpurified CuPc is nearly three orders of magnitude lower than for purified source material. Mass spectrometry and Fourier transform infrared spectroscopy are used to identify metal-free phthalocyanine as the primary impurity that degrades both device efficiency and hole mobility.

Original languageEnglish (US)
Pages (from-to)242-246
Number of pages5
JournalOrganic Electronics
Issue number5-6
StatePublished - Dec 2005

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • General Chemistry
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering


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