The effects of core-level broadening in determining band alignment at the epitaxial SrTiO3 (001)/p-Ge(001) heterojunction

Chambers, Scott A.; Du, Yingge; Comes, Ryan B.; Spurgeon, Steven R.; Sushko, Peter V.

doi:10.1063/1.4977422

The effects of core-level broadening in determining band alignment at the epitaxial SrTiO₃ (001)/p-Ge(001) heterojunction

Journal Article · Mon Feb 20 04:00:00 EST 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4977422· OSTI ID:1454742

Chambers, Scott A. ^[1]; Du, Yingge ^[1]; Comes, Ryan B. ^[1]; ^[1]; Sushko, Peter V. ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical and Computational Sciences Directorate

Chemical effects at the surface and interface can broaden core-level spectra in X-ray photoemission for thin-film heterojunctions, as can electronic charge redistributions. We explore these effects and their influence on the measurement of valence and conduction band offsets at the epitaxial SrTiO₃(001)/p-Ge(001) heterojunction. Here, we observe a clear broadening in Ge 3d and Sr 3d core-level X-ray photoelectron spectra relative to those of clean, bulk Ge(001), and homoepitaxial SrTiO₃(001), respectively. Angle-resolved measurements indicate that this broadening is driven primarily by chemical shifts associated with surface hydroxylation, with built-in potentials playing only a minor role. The impact of these two interpretations on the valence band offset is significant on the scale of transport energetics, amounting to a difference of 0.2 eV.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1454742

Alternate ID(s):: OSTI ID: 1348949

Report Number(s):: PNNL-SA--123225

Journal Information:: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 8 Vol. 110; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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