Mapping hidden space-charge distributions across crystalline metal oxide/group IV semiconductor interfaces

Chambers, Scott A.; Chrysler, M.; Ngai, Joseph H.; Lee, Tien-Lin; Gabel, Judith; Matthews, Bethany E.; Spurgeon, Steven R.; Bowden, Mark E.; Zhu, Zihua; Sushko, Petr V.

doi:10.1103/physrevmaterials.6.015002

Title: Mapping hidden space-charge distributions across crystalline metal oxide/group IV semiconductor interfaces

Journal Article · 20 January 2022 · Physical Review Materials

DOI: https://doi.org/10.1103/physrevmaterials.6.015002 · OSTI ID:1907850

^[1]; Chrysler, M. ^[2]; Ngai, Joseph H. ^[2]; Lee, Tien-Lin ^[3];

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^[4]; Bowden, Mark E. ^[5];

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Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Physical Sciences Division
Univ. of Texas, Arlington, TX (United States)
Harwell Science and Innovation Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Nuclear Sciences Division
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)

The electronic structures of semiconducting heterojunctions are critically dependent on composition including the presence and concentrations of dopants, both intended and unintended. Dopant profiles in the interfacial region can have major effects on band energies which in turn drive transport properties. Here, in this study, we use core-level photoelectron line shapes excited with hard x rays to extract information about electric fields resulting from internal charge transfer in epitaxial La_0.03Sr_0.97Zr_xTi_1–xO₃/Ge(001) (0.1≤x≤0.7) heterostructures. Experiments were carried out for heterojunctions involving both n- and p-type Ge substrates. These heterojunctions were not amenable to electronic characterization of all regions by transport measurements because the doped substrates act as electrical shunts, precluding probing the more resistive films and masking interface conductivity. However, the core-level line shapes were found to be a rich source of information on built-in potentials that exist throughout the heterostructure, and yielded valuable insight into the impact of band bending on band alignment at the buried interfaces. The electronic effects expected for Ge with uniform n- and p-type doping are eclipsed by those of unintended oxygen dopants in the Ge near the interface. This study illustrates the power of hard x-ray photoemission spectroscopy and related modeling to determine electronic structure in material systems for which insight from traditional transport measurements is limited.

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

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1907850

Report Number(s):: PNNL-SA-166057

Journal Information:: Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 1 Vol. 6; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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