Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO3
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10371412" target="_blank" >RIV/00216208:11320/17:10371412 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1063/1.4983618" target="_blank" >http://dx.doi.org/10.1063/1.4983618</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/1.4983618" target="_blank" >10.1063/1.4983618</a>
Alternative languages
Result language
angličtina
Original language name
Oxygen partial pressure dependence of surface space charge formation in donor-doped SrTiO3
Original language description
In this study, we investigated the electronic surface structure of donor-doped strontium titanate. Homoepitaxial 0.5 wt.% donor-doped SrTiO3 thin films were analyzed by in situ near ambient pressure X-ray photoelectron spectroscopy at a temperature of 770 K and oxygen pressures up to 5 mbar. Upon exposure to an oxygen atmosphere at elevated temperatures, we observed a rigid binding energy shift of up to 0.6 eV towards lower binding energies with respect to vacuum conditions for all SrTiO3 core level peaks and the valence band maximum with increasing oxygen pressure. The rigid shift is attributed to a relative shift of the Fermi energy towards the valence band concomitant with a negative charge accumulation at the surface, resulting in a compensating electron depletion layer in the near surface region. Charge trapping effects solely based on carbon contaminants are unlikely due to their irreversible desorption under the given experimental conditions. In addition, simple reoxygenation of oxygen vacancies can be ruled out as the high niobium dopant concentration dominates the electronic properties of the material. Instead, the negative surface charge may be provided by the formation of cation vacancies or the formation of charged oxygen adsorbates at the surface. Our results clearly indicate a pO(2)-dependent surface space charge formation in donor-doped SrTiO3 in oxidizing conditions. (C) 2017 Author(s).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
APL Materials [online]
ISSN
2166-532X
e-ISSN
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Volume of the periodical
5
Issue of the periodical within the volume
5
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
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UT code for WoS article
000402754200019
EID of the result in the Scopus database
2-s2.0-85029896627