Interfacial morphology in polymer light-emitting diodes

Yeau Ren Jeng, Ming Lung Guo, Hung Chang Li, Tzung Fang Guo

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This work considers the anode at the indium-tin oxide (ITO)/poly[2-methoxy- 5- (2′ -ethylhexyloxy)-1,4-phenylene vinylene] (MEH-PPV) interface in polymer light-emitting diodes (PLEDs). The surface morphology of ITO is studied by scanning probe microscopy (SPM). The mechanical properties of ITO and MEH-PPV are measured by nanoindentation. The results indicate that the surface roughness, defined as the root-mean-square of the surface height on the surface of the ITO substrate, influences the injection of hole-carriers. The injected current is dominated by the tunneling of hole-carriers at the low bias. Increasing the effect contact area at the ITO/MEH-PPV interface lowers the barrier to the injection of holes through the ITO anode to the MEH-PPV light-emitting layer.

Original languageEnglish
Pages (from-to)D139-D141
JournalElectrochemical and Solid-State Letters
Issue number12
Publication statusPublished - 2007

All Science Journal Classification (ASJC) codes

  • General Chemical Engineering
  • General Materials Science
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering


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