ITO-based cathode for application in semitransparent organic photovoltaic cells

Ging Meng Ng*, Elizabeth Lekha Kietzke, Thomas Kietzke, Li Wei Tan, Pooi Kwan Liew, Furong Zhu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


A high performance semitransparent cathode is one of the major impediments to the high performance semitransparent and tandem organic photovoltaic (OPV) cells. In this work, we discuss the possible designs of semitransparent cathode to improve the performance of semitransparent OPV cells. The optical properties of the poly(3-hexylthiophene) (P3HT): 1-(3-methoxycarbonyl)-propyl-l-phenyl-(6, 6)C61 (PCBM)-based OPV cells were studied by the optical admittance analysis. The performance of the OPV cells made with an opaque Ca(10nm)/Ag(100nm) cathode and a semitransparent Ca(10nm)/Ag(10nm)/ITO cathode are discussed. The interfacial properties at the cathode/organic interface were analyzed using the time-of-flight secondary ion mass spectroscopy (TOF-SIMS). The TOF-SIMS depth profile revealed that calcium oxide formed at the Ca/organic interface in semitransparent OPV cells, which was induced by the ITO sputtering process. It shows that the presence of calcium oxide at the organic/cathode interface could be the main reason resulting in a poor fill factor of a semitransparent OPV cell (∼23%) as compared to that of a reference cell (∼43%).

Original languageEnglish
Article number208
Number of pages10
JournalMRS Online Proceedings Library
Issue number1
Early online date1 Nov 2007
Publication statusPublished - Dec 2007
EventOrganic and Nanoparticle Hybrid Photovoltaic Devices - 2007 MRS Spring Meeting - San Francisco, CA, United States
Duration: 9 Apr 200713 Apr 2007

Scopus Subject Areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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