Characterization of high-photovoltage CuPc-based solar cell structures

V. P. Singh, B. Parsarathy, R. S. Singh, A. Aguilera, J. Anthony, M. Payne

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


Organic solar cells of the configuration ITO/PEDOT:PSS/CuPc/PTCBI/Al (Indium Tin Oxide/poly(3,4-ethylenedioxythiophene): polystyrene sulfonic acid/Copper phthalocyanine/3,4,9,10-perylenetetracarboxylic bisbenzimidazole/ Aluminum ) were investigated. A high open circuit voltage (VOC) of 1.15 V was obtained when the PTCBI layer was 7 nm thick. Lower Voc values were observed for the same structure with silver, copper and gold electrodes instead of aluminum. However, short-circuit current density (JSC) with these electrodes was much higher (4 mA/cm2) than in the case of aluminum (0.12 mA/cm2). Incorporating a 10 nm thick CdS interlayer between PTCBI and aluminum resulted in an increase in current density to 0.3 mA/cm2. Results were interpreted in terms of a modified CuPc/Al Schottky diode for the thin PTCBI case and a CuPc/PTCBI heterojunction for the thick PTCBI case. Also, the formation of a thin, protective aluminum oxide layer under the aluminum electrode was postulated. For devices with silver, copper and gold electrodes, absence of this protective layer was thought to be the cause of a relatively lower Voc and higher JSC.

Original languageEnglish
Pages (from-to)798-812
Number of pages15
JournalSolar Energy Materials and Solar Cells
Issue number6 SPEC. ISS.
StatePublished - Apr 14 2006

Bibliographical note

Funding Information:
This work was supported in part by a grant from the Kentucky Science and Engineering Foundation as per Grant Agreement # KSEF-148-502-02-27 with the Kentucky Science and Technology Corporation.


  • CuPc/PTCBI solar cells
  • Electron transport modeling
  • Organic semiconductors

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films


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