Trap-clearing Spectroscopy in Perylene Diimide Derivatives

Louisa M. Smieska, Zhong Li, David Ley, Adam Braunschweig, John A. Marohn

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Perylene diimide (PDI) derivatives are important components of organic circuits and photovoltaic systems, but the electron trapping mechanism(s) in higher-LUMO PDIs (-3 to -4 eV, where radical anions are expected to react with atmospheric water and oxygen) are not well characterized. Here, we examine the spatial distribution of traps in transistors made from PDIs with these higher LUMO levels and measure trap-clearing spectra in n-type organic materials using time- and wavelength-resolved frequency-modulated Kelvin probe force microscopy (FM-KPFM). We find that the rate of trap-clearing under visible light does not follow a LUMO-level trend, and we observe spectral evidence for different trapping mechanisms on bare versus HMDS-treated SiO2.

Original languageEnglish (US)
Pages (from-to)813-820
Number of pages8
JournalChemistry of Materials
Volume28
Issue number3
DOIs
StatePublished - Feb 9 2016

ASJC Scopus subject areas

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

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    Smieska, L. M., Li, Z., Ley, D., Braunschweig, A., & Marohn, J. A. (2016). Trap-clearing Spectroscopy in Perylene Diimide Derivatives. Chemistry of Materials, 28(3), 813-820. https://doi.org/10.1021/acs.chemmater.5b04025