Surface determination through atomically resolved secondary-electron imaging

Ciston, J.; Brown, H. G.; D’Alfonso, A. J.; Koirala, P.; Ophus, C.; Lin, Y.; Suzuki, Y.; Inada, H.; Zhu, Y.; Allen, L. J.; Marks, L. D.

doi:10.1038/ncomms8358

Title: Surface determination through atomically resolved secondary-electron imaging

Journal Article · Wed Jun 17 00:00:00 EDT 2015 · Nature Communications

DOI:https://doi.org/10.1038/ncomms8358· OSTI ID:1255531

Ciston, J. ^[1]; Brown, H. G. ^[2]; D’Alfonso, A. J. ^[2]; Koirala, P. ^[3]; Ophus, C. ^[1]; Lin, Y. ^[3]; Suzuki, Y. ^[4]; Inada, H. ^[4]; Zhu, Y. ^[5]; Allen, L. J. ^[2]; Marks, L. D. ^[3]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Univ. of Melbourne (Australia)
Northwestern Univ., Evanston, IL (United States)
Hitachi High Technologies Corp., Ibaraki (Japan)
Brookhaven National Lab. (BNL), Upton, NY (United States)

We report that unique determination of the atomic structure of technologically relevant surfaces is often limited by both a need for homogeneous crystals and ambiguity of registration between the surface and bulk. Atomically resolved secondary-electron imaging is extremely sensitive to this registration and is compatible with faceted nanomaterials, but has not been previously utilized for surface structure determination. Here we show a detailed experimental atomic-resolution secondary-electron microscopy analysis of the c(6 x 2) reconstruction on strontium titanate (001) coupled with careful simulation of secondary-electron images, density functional theory calculations and surface monolayer-sensitive aberration-corrected plan-view high-resolution transmission electron microscopy. Our work reveals several unexpected findings, including an amended registry of the surface on the bulk and strontium atoms with unusual seven-fold coordination within a typically high surface coverage of square pyramidal TiO₅ units. Lastly, dielectric screening is found to play a critical role in attenuating secondary-electron generation processes from valence orbitals.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-01ER45945; DMR-1206320; AC02-05CH11231; AC02-98CH10886

OSTI ID:: 1255531

Journal Information:: Nature Communications, Vol. 6; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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