Nondispersive hole transport in a spin-coated dendrimer film measured by the charge-generation-layer time-of-flight method

JPJ Markham, TD Anthopoulos, Ifor David William Samuel, GJ Richards, PL Burn, C Im, H Bassler

Research output: Contribution to journalArticlepeer-review

33 Citations (Scopus)

Abstract

Measurements of the mobility of a first-generation (G1) bis-fluorene cored dendrimer have been performed on spin-coated samples of 500 nm thickness using the charge-generation-layer time-of-flight (TOF) technique. A 10 nm perylene charge generation layer was excited by the 532 nm line of a Q-switched Nd:YAG laser and the generated carriers swept through the dendrimer film under an applied field. We observe nondispersive hole transport in the dendrimer layer with a room-temperature mobility mu=2.0x10(-4) cm(2)/V s at a field of 0.55 MV/cm. There is a weak field dependence of the mobility and it increases from mu=1.6x10(-4) cm(2)/V s at 0.2 MV/cm to mu=3.0x10(-4) cm(2)/V s at 1.4 MV/cm. These results suggest that the measurement of mobility by TOF in spin-coated samples on thickness scales relevant to organic light-emitting diodes can yield valuable information, and that dendrimers are promising materials for device applications. (C) 2002 American Institute of Physics.

Original languageEnglish
Pages (from-to)3266
Number of pages3266
JournalApplied Physics Letters
Volume81
DOIs
Publication statusPublished - 21 Oct 2002

Keywords

  • LIGHT-EMITTING-DIODES
  • CONJUGATED POLYMERS
  • MOBILITY
  • POLYFLUORENE
  • EFFICIENCY
  • PERFORMANCE
  • MORPHOLOGY
  • INJECTION
  • DEVICES
  • BLUE

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