Encapsulation of organic field-effect transistors with highly polarizable transparent amorphous oxide

Woo Jin Kim, Won Hoe Koo, Sung Jin Jo, Chang Su Kim, Hong Koo Baik, Jiyoul Lee, Seongil Im

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3 Citations (Scopus)

Abstract

To enhance the stability of pentacene field-effect transistors, a highly polarizable amorphous oxide is used as a gas barrier due to the strong chemical interaction between permeating polar water molecules and an oxide. For a more reliable barrier function, in addition to chemical effects, a dense amorphous microstructure of a barrier is also preferred and achieved by ion-beam-assisted deposition (IBAD) at room temperature in this study. Our OTFTs encapsulated with IBAD SnO2 showed a degraded field-effect mobility of 0.5cm 2/(V s) after encapsulation. However, the field-effect mobility was surprisingly sustained up to one month and then gradually degraded down to 0.35 cm2/(V s) after 100 days in air, which was still three times higher than that of an OTFT without an encapsulation layer. The encapsulated OTFTs also exhibited a superior on/off current ratio of more than 105 to that of the unprotected device (∼ 104), which was reduced from ∼10 6 before aging. The effects of encapsulation on the electrical properties of OTFTs are discussed in terms of the physical and chemical properties of barrier films.

Original languageEnglish
Pages (from-to)L1174-L1177
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume44
Issue number37-41
DOIs
Publication statusPublished - 2005 Sep 30

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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