A polymer brush organic interlayer improves the overlying pentacene nanostructure and organic field-effect transistor performance

Song Hee Park, Hwa Sung Lee, Jong Dae Kim, Dag W. Breiby, Eunhye Kim, Yeong Don Park, Du Yeol Ryu, Dong Ryeol Lee, Jeong Ho Cho

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We investigated the crystalline nanostructures and film morphologies of pentacene films deposited onto a polymer brush organic interlayer in high performance organic field-effect transistors (OFETs). Polymer brushes were grafted onto the oxide substrates by spin-coating and thermal annealing. Pentacene FETs fabricated on top of the polymer brushes showed excellent device performance, with a field-effect mobility of 0.82 cm2 V-1 s-1 and an on/off current ratio of 107. These properties were superior to those of devices using typical surface modification techniques, such as octadecyltrichlorosilane (ODTS) and hexamethyldisilazane (HMDS). The improvements in OFET performance appeared to be due to the pentacene layer's crystalline nanostructure and grain interconnectivity, which formed during the submonolayer stage of film growth. This stage of growth is strongly correlated with the surface energy, morphology, and viscoelastic properties of the resulting gate dielectrics. The inclusion of a polymer brush dielectric surface modification is a significant step toward optimizing the nanostructures of organic semiconductors, which are directly linked to device performance enhancement, by engineering the interfaces in OFETs.

Original languageEnglish
Pages (from-to)15580-15586
Number of pages7
JournalJournal of Materials Chemistry
Volume21
Issue number39
DOIs
Publication statusPublished - 2011 Oct 21

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Organic field effect transistors
Brushes
Nanostructures
Polymers
Surface treatment
Crystalline materials
Semiconducting organic compounds
Gate dielectrics
Spin coating
Film growth
Field effect transistors
Interfacial energy
Oxides
Annealing
pentacene
Substrates

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Chemistry

Cite this

Park, Song Hee ; Lee, Hwa Sung ; Kim, Jong Dae ; Breiby, Dag W. ; Kim, Eunhye ; Park, Yeong Don ; Ryu, Du Yeol ; Lee, Dong Ryeol ; Cho, Jeong Ho. / A polymer brush organic interlayer improves the overlying pentacene nanostructure and organic field-effect transistor performance. In: Journal of Materials Chemistry. 2011 ; Vol. 21, No. 39. pp. 15580-15586.
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A polymer brush organic interlayer improves the overlying pentacene nanostructure and organic field-effect transistor performance. / Park, Song Hee; Lee, Hwa Sung; Kim, Jong Dae; Breiby, Dag W.; Kim, Eunhye; Park, Yeong Don; Ryu, Du Yeol; Lee, Dong Ryeol; Cho, Jeong Ho.

In: Journal of Materials Chemistry, Vol. 21, No. 39, 21.10.2011, p. 15580-15586.

Research output: Contribution to journalArticle

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