Enhanced p-Type Work Function Tunability Induced by Electrostatic Molecular Alignment and Surface Coverage in Conjugated Small-Molecule Electrolyte

Jong Hoon Lee, Sooncheol Kwon, Song Yi Jeong, Byoungwook Park, Soonil Hong, Jehan Kim, Soo Young Jang, Kwanghee Lee

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We report that a chemically p-doped conjugated small-molecule electrolyte (CSE) can be used as a strong and uniform dipole array for highly efficient optoelectronic devices via electrostatically induced molecular alignment and surface coverage on metal electrodes. On the basis of the structural and electrical characterization as well as evaluation of the surface potential, we confirm a close structure-property relationship in the p-doped CSE; the CSE molecules can interact electrostatically with each other and with the metal surface, leading to an out-of-plane orientation and full surface coverage, respectively, providing a superior WF tunability compared to that of its polymeric counterpart. Our results clearly indicate that the overall strength of the electric dipoles in the thin-film interfacial layer can be controlled by the degree of molecular alignment and coverage, making this material broadly applicable in highly efficient optoelectronics.

Original languageEnglish
Pages (from-to)2566-2573
Number of pages8
JournalACS Applied Electronic Materials
Volume1
Issue number12
DOIs
StatePublished - 24 Dec 2019

Keywords

  • conjugated small-molecule electrolyte
  • interface engineering
  • molecular alignment
  • plastic electronics
  • work function tenability

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