Interface control by surface-initiated deposition polymerization and its application to organic light-emitting devices

Akira Kawakami, Kiyoi Katsuki, Rigoberto C. Advincula, Kuniaki Tanaka, Kenji Ogino, Hiroaki Usui

研究成果: Article

21 引用 (Scopus)


Surface-initiated deposition polymerization was applied to the preparation of a hole transport layer (HTL) on an indium-tin oxide (ITO) electrode. A silane-based self-assembled monolayer (SAM) that has an azo terminal group was prepared on an ITO surface on which a vinyl monomer of carbazole (CPA) or tetraphenyldiaminobiphenyl (vTPD) was deposited by physical vapor deposition. The polymerization of the HTL was achieved by electron-assisted deposition. UV irradiation, as well as conventional evaporation, was not capable of growing polymer films on the SAM. Organic light-emitting diodes (OLEDs) were prepared by depositing tris(8-quinolinolato) aluminum (Alq3) on the HTL. The surface-initiated deposition polymerization was effective in markedly increasing device current flow and reducing turn-on voltage. However, luminescence efficiency was not improved by this method owing to improper carrier balance under excessive hole injection. Nevertheless, surface-initiated deposition polymerization was effective in improving film morphology, stability, and hole injection characteristics.

ジャーナルJapanese Journal of Applied Physics
発行部数4 PART 2
出版物ステータスPublished - 2008 4 25


ASJC Scopus subject areas

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