Atomic structure of Sr/Si(0 0 1)(1 × 2) surfaces prepared by Pulsed laser deposition

DFT; Pulsed laser deposition; Scanning tunneling microscopy; Silicon; Strontium; Surface defects; Buffer layers; Crystal atomic structure; Programmable logic controllers; Temperature; DFT calculation; Functional oxides; Low-amplitude; Low-temperature scanning tunneling microscopy; Measured values; Precise control; Si(0 0 1) surface; Situ reflection; Pulsed lasers

Abstract :

[en] A buffer layer formed by depositing a ½ monolayer of Sr on Si(0 0 1) is known to passivate the Si surface, while its surface structure constitutes a suitable template for the integration of various functional oxides with the existing Si platform. We used Pulsed Laser Deposition (PLD) to prepare a Sr/Si(0 0 1)(1 × 2) surface and analysed it using in-situ Reflection High-Energy Diffraction (RHEED) in combination with low-temperature Scanning Tunneling Microscopy (STM). The STM images reveal an atomically ordered surface with terraces composed of one-dimensional (1D) chains running along perpendicular directions on neighbouring terraces. The 1D chains are separated by 0.78 nm and exhibit a low-amplitude corrugation with a period of 0.39 nm. The measured values agree well with the size of the (1 × 2) unit cell observed for similar MBE-grown surfaces, while the density of the surface defects is somewhat higher in the presented case. According to simulated STM images based on DFT calculations, two types of surface defects were identified and explored: arrays of Sr vacancies and Sr adatoms. These results show that PLD can offer precise control for the preparation of high-quality Sr-buffered Si(0 0 1) surfaces. © 2018 Elsevier B.V.

Disciplines :

Physics

Author, co-author :

Parkelj Potočnik, T.; Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia, Jožef Stefan International Postgraduate School, Jamova 39, Ljubljana, 1000, Slovenia

Zupanič, E.; Condensed Matter Physics Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia

Tong, Wenyi ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Bousquet, Eric ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Diaz Fernandez, D.; Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia

Koster, G.; Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands

Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux

Spreitzer, M.; Advanced Materials Department, Jožef Stefan Institute, Jamova 39, Ljubljana, 1000, Slovenia

Language :

English

Title :

Atomic structure of Sr/Si(0 0 1)(1 × 2) surfaces prepared by Pulsed laser deposition

Publication date :

2019

Journal title :

Applied Surface Science

ISSN :

0169-4332

eISSN :

1873-5584

Publisher :

Elsevier B.V., Netherlands

Volume :

471

Pages :

664-669

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

CÉCI : Consortium des Équipements de Calcul Intensif
Tier-1 supercomputer

Funders :

FWB - Fédération Wallonie-Bruxelles

Funding text :

Javna Agencija za Raziskovalno Dejavnost RS: PR-06807, J2-9237, J2-6759Fédération Wallonie-Bruxelles11175452.5020.1, Tier-1

Available on ORBi :

since 02 August 2019

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