Nature of the surface space charge layer on undoped SrTiO3 (001)

SrTiO3, an ABO3-type perovskite structure, has been a popular choice of substrate for many important heterostructures, e.g., ferroelectric thin films and superlattices. As numerous exotic physical phenomena are closely related to delicate electron/ion exchanges at the interfacial layer between the s...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2021-10, Vol.9 (38), p.13094-13102
Main Authors: Lim, Hojoon, Song, Chanyang, Seo, Minsik, Kim, Dongwoo, Jung, Moonjung, Kang, Habin, Kim, Seunghwan, Kyung-Jae, Lee, Yu, Youngseok, Kim, Geonhwa, Ki-Jeong, Kim, Bongjin Simon Mun
Format: Article
Language:English
Subjects:
AC generators
Contact potentials
Depletion
Doping
Electric contacts
Electrical properties
Electron states
Electrons
Ferroelectricity
Gas pressure
Heterostructures
High vacuum
Interfacial properties
Low energy electron diffraction
Perovskite structure
Perovskites
Space charge
Strontium titanates
Substrates
Superlattices
Superstructures
Surface defects
Thin films
Vacancies
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:SrTiO3, an ABO3-type perovskite structure, has been a popular choice of substrate for many important heterostructures, e.g., ferroelectric thin films and superlattices. As numerous exotic physical phenomena are closely related to delicate electron/ion exchanges at the interfacial layer between the substrate and overlayer, precise characterization of surface/interfacial properties has become the center of many research studies. In most cases of SrTiO3 research, Nb-doping is applied on the SrTiO3 surface in order to characterize electrical properties with a negligible effect of contact potential between SrTiO3 and overlayer. On the other hand, the presence of doping can possibly interfere with a correct interpretation of the surface defect states, which become critical to apprehend the electrical properties of heterostructures. In this report, the undoped SrTiO3 (001) surface is investigated utilizing ambient-pressure XPS (AP-XPS) and low energy electron diffraction (LEED). We identified the complete chemical/structural/electronic states of O and Sr vacancies on the undoped SrTiO3 surface from ultra-high vacuum (UHV,
ISSN:2050-7526
2050-7534
DOI:10.1039/d1tc03436g