Ångström-resolved Interfacial Structure in Organic-Inorganic Junctions
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Open Access Publications from the University of California

Ångström-resolved Interfacial Structure in Organic-Inorganic Junctions

  • Author(s): Schwartz, Craig P
  • Raj, Sumana L
  • Jamnuch, Sasawat
  • Hull, Chris J
  • Miotti, Paolo
  • Lam, Royce K
  • Nordlund, Dennis
  • Uzundal, Can B
  • Pemmaraju, Chaitanya Das
  • Mincigrucci, Riccardo
  • Foglia, Laura
  • Simoncig, Alberto
  • Coreno, Marcello
  • Masciovecchio, Claudio
  • Giannessi, Luca
  • Poletto, Luca
  • Principi, Emiliano
  • Zuerch, Michael
  • Pascal, Tod A
  • Drisdell, Walter S
  • Saykally, Richard J
  • et al.

Charge transport processes at interfaces which are governed by complex interfacial electronic structure play a crucial role in catalytic reactions, energy storage, photovoltaics, and many biological processes. Here, the first soft X-ray second harmonic generation (SXR-SHG) interfacial spectrum of a buried interface (boron/Parylene-N) is reported. SXR-SHG shows distinct spectral features that are not observed in X-ray absorption spectra, demonstrating its extraordinary interfacial sensitivity. Comparison to electronic structure calculations indicates a boron-organic separation distance of 1.9 {\AA}, wherein changes as small as 0.1 {\AA} result in easily detectable SXR-SHG spectral shifts (ca. 100s of meV). As SXR-SHG is inherently ultrafast and sensitive to individual atomic layers, it creates the possibility to study a variety of interfacial processes, e.g. catalysis, with ultrafast time resolution and bond specificity.

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