Effect of the phase states of self-assembled monolayers on pentacene growth and thin-film transistor characteristics

Hwa Sung Lee, Do Hwan Kim, Jeong Ho Cho, Minkyu Hwang, Yunseok Jang, Kilwon Cho

Research output: Contribution to journalArticle

181 Citations (Scopus)

Abstract

To investigate the effects of the phase state (ordered or disordered) of self-assembled monolayers (SAMs) on the growth mode of pentacene films and the performance of organic thin-film transistors (OTFTs), we deposited pentacene molecules on SAMs of octadecyltrichlorosilane (ODTS) with different alkyl-chain orientations at various substrate temperatures (30, 60, and 90°C). We found that the SAM phase state played an important role in both cases. Pentacene films grown on relatively highly ordered SAMs were found to have a higher crystallinity and a better interconnectivity between the pentacene domains, which directly serves to enhance the field-effect mobility, than those grown on disordered SAMs. Furthermore, the differences in crystallinity and field-effect mobility between pentacene films grown on ordered and disordered substrates increased with increasing substrate temperature. These results can be possibly explained by (1) a quasi-epitaxy growth of the pentacene film on the ordered ODTS monolayer and (2) the temperature-dependent alkyl chain mobility of the ODTS monolayers.

Original languageEnglish
Pages (from-to)10556-10564
Number of pages9
JournalJournal of the American Chemical Society
Volume130
Issue number32
DOIs
Publication statusPublished - 2008 Aug 13

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Fingerprint Dive into the research topics of 'Effect of the phase states of self-assembled monolayers on pentacene growth and thin-film transistor characteristics'. Together they form a unique fingerprint.

  • Cite this