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We studied electronic states in dimethyl sulfoxide (DMSO) films on copper. A transient small polaron state forms and leads to long-lived states, potentially impacting battery reactivity.

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Area of Science:

  • Surface Science
  • Physical Chemistry
  • Materials Science

Background:

  • Electronic state dynamics near metal electrodes govern charge transport and degradation in batteries.
  • Understanding intermediate electronic states is key to optimizing battery performance and longevity.

Purpose of the Study:

  • Investigate the formation dynamics of small polarons in dimethyl sulfoxide (DMSO) films on Cu(111).
  • Elucidate the role of small polarons as intermediate electronic states in molecular films.

Main Methods:

  • Utilized time- and angle-resolved two-photon photoemission spectroscopy.
  • Analyzed electronic state localization and lifetime dynamics in DMSO thin films on a copper surface.

Main Results:

  • A delocalized DMSO electronic state localizes into a small polaron within 200 fs.
  • This small polaron acts as a precursor to a long-lived (seconds) multilayer electronic state.
  • The small polaron lifetime is approximately 140 fs, significantly shorter than the resulting state.

Conclusions:

  • Small polarons in DMSO films are transient but crucial intermediates.
  • Their role as precursors to long-lived states suggests importance in multistep battery reaction mechanisms.
  • Findings provide insights into charge transport and degradation pathways relevant to battery technology.