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Peculiarities in XPS spectra of Sn/SiO2 layers as an effect of surface charge

DOI: 10.1016/j.rinp.2024.107733 DOI Help

Authors: Poting Liu (Leibniz Institute of Photonic Technology; Friedrich-Schiller-University Jena) , Katharina Freiberg (Friedrich Schiller University Jena) , David C. Grinter (Diamond Light Source) , Vladimir Sivakov (Leibniz Institute of Photonic Technology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Results In Physics , VOL 61

State: Published (Approved)
Published: June 2024
Diamond Proposal Number(s): 37075

Open Access Open Access

Abstract: X-ray photoelectron spectroscopy based on synchrotron radiation was used to investigate the composition of the observed SnO2-x/Sn:SiO2-x thin layer grown by organometallic chemical vapour deposition on single-crystalline silicon wafer with additional argon ions etching treatment. Due to the formation of a thermodynamic anomaly during in situ layer growth, an efficient oxygen exchange between silicon and tin oxide phases occurs. The present study addresses the effect of localized surface charging and its influence on the obtained XPS core level spectra. We found that due to the high electrical conductivity of metallic tin and the direct coupling of tin particles to the silicon wafer, the XPS Sn 3d5/2 core level spectrum is not affected by the surface charge compared to the highly charged dielectric silicon oxide matrix, as observed for the XPS O 1 s and Si 2p core level spectra. Our results show that the core level spectra of Si 2p and O 1 s are shifted up to 3 eV due to the presence of uncompensated positive charge on the surface of the silica matrix. These results provide insight into the influence of surface charge effects on the analysis of conductor/insulator composite materials and contribute to the application of Sn-based materials in various application concepts related to energy and surface functionalization.

Subject Areas: Materials, Physics

Instruments: B07-B-Versatile Soft X-ray beamline: High Throughput

Added On: 08/05/2024 09:29


Discipline Tags:

Surfaces Physics Materials Science

Technical Tags:

Spectroscopy X-ray Photoelectron Spectroscopy (XPS)