Sodium doping in copper-phthalocyanine/C60 heterojunction for organic photovoltaic applications

Hui Ju Chen, Hsuan Ta Wu, Kuang Teng Hung, Sheng Wen Fu, Chuan Feng Shih

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Sodium was incorporating at the copper-phthalocyanine (CuPc)/C60 interface in CuPc/C60-based small-molecular solar cells to enhance their power conversion efficiency. C60 was deposited on slightly sodium-doped CuPc. Post-annealing improved the cell properties. Post-annealing doubled the conversion efficiency of the least sodium-doped devices (75 °C, 40 min). The electron/hole mobility ratio gradually approached unity as the annealing time increased, indicating that a reduction in the space charge accumulation was the main cause of the increase of the short-circuit current. Themechanismof enhancement of carrier transport by annealing was investigated by making capacitance-voltage measurements and performing corresponding depth-profile analyses.

Original languageEnglish
Pages (from-to)249-253
Number of pages5
JournalThin Solid Films
Volume544
DOIs
Publication statusPublished - 2013 Oct 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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