Copper migration and surface oxidation of CuxBi2Se3 in ambient pressure environments

Gross, Adam L.; Falling, Lorenz; Staab, Matthew C.; Montero, Metzli I.; Ullah, Rahim R.; Nisson, David M.; Klavins, Peter; Koski, Kristie J.; Curro, Nicholas J.; Taufour, Valentin; Nemsak, Slavomir; Vishik, Inna M.

doi:10.1088/2515-7639/ac93b5

Title: Copper migration and surface oxidation of CuxBi2Se3 in ambient pressure environments

Journal Article · 04 October 2022 · JPhys Materials

DOI: https://doi.org/10.1088/2515-7639/ac93b5 · OSTI ID:1891030

;

; Montero, Metzli I.; Ullah, Rahim R.; Nisson, David M.; Klavins, Peter;

;

Abstract Chemical modifications such as intercalation can be used to modify surface properties or to further functionalize the surface states of topological insulators (TIs). Using ambient pressure x-ray photoelectron spectroscopy, we report copper migration in ${C u}_{x} {B i}_{2} {S e}_{3}$ , which occurs on a timescale of hours to days after initial surface cleaving. The increase in near-surface copper proceeds along with the oxidation of the sample surface and large changes in the selenium content. These complex changes are further modeled with core-level spectroscopy simulations, which suggest a composition gradient near the surface which develops with oxygen exposure. Our results shed light on a new phenomenon that must be considered for intercalated TIs—and intercalated materials in general—that surface chemical composition can change when specimens are exposed to ambient conditions.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Alfred P. Sloan Foundation; National Science Foundation; US Air Force Office of Scientific Research (AFOSR); USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1891030

Journal Information:: JPhys Materials, Journal Name: JPhys Materials Journal Issue: 4 Vol. 5; ISSN 2515-7639

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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