Injection of current densities over kA/cm2 in organic thin films and investigation of charge-carrier transport mechanisms in current density region between nA/cm2 and kA/cm2

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Abstract

We investigate current density-voltage (J-V) characteristics of copper phthalocyanine thin-film devices, with active areas ranging from S = 1,000,000 to 7.9 μm2, and analyze their charge-carrier transport mechanisms under current densities between nA/cm2 and kA/cm2. We demonstrate injection of 128 kA/cm2 in the smallest device having S = 7.9 μ2. Furthermore, we find that J-V characteristics are divided into three regions between nA/cm2 and kA/cm2: ohm current, shallow-trap space-charge-limited current (SCLC), and trap-free SCLC. In a shallow-trap SCLC region, we observe a large shift in J-V characteristics depending upon the active areas. From analyses of carrier traps with a thermally stimulated current (TSC) measurement, we see that TSC signal intensities of these films decrease as the active area is reduced. Hence, we conclude that a large shift in J-V characteristics is attributable to the change of carrier trap concentrations in these films.

Original languageEnglish
Article number63331O
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume6333
DOIs
Publication statusPublished - Dec 1 2006
EventOrganic Ligh Emitting Materials and Devices X - San Diego, CA, United States
Duration: Aug 13 2006Aug 16 2006

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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