Measurement of ultralow injection current to polymethyl-methacrylate film

Feng Yan, Yi Hong, Helen L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

10 Citations (Scopus)


Ultralow electron/hole injection currents from an electrode to a polymethyl-methacrylate (PMMA) film can be accurately decided by measuring the slow shift in the flatband voltage of a metal-insulator-semiconductor (MIS) device. It has been found that both the electron and hole injection currents are limited by the metal/PMMA interface and can be roughly described with a modified Richardson-Schottky equation. The space charge or dipole relaxation in PMMA films has been observed as well, which induces an instant change in flatband voltage of the MIS devices. These properties are critical issues for the stability of organic thin film transistors with PMMA gate insulator.
Original languageEnglish
Article number243301
JournalApplied Physics Letters
Issue number24
Publication statusPublished - 30 Jun 2008

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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