Electron Transport at the TiO2 Surfaces of Rutile, Anatase, and Strontium Titanate: The Influence of Orbital Corrugation

被引：43

作者：

Sarkar, Tarapada ^{[1
,2
,5
,6
]}

Gopinadhan, Kalon ^{[1
,5
,6
]}

Zhou, Jun ^{[2
]}

Saha, Surajit ^{[1
,5
,6
]}

Coey, J. M. D. ^{[1
,5
,6
]}

Feng, Yuan Ping ^{[2
]}

Ariando ^{[1
,2
,5
,6
]}

Venkatesan, T. ^{[1
,2
,3
,4
,5
,6
]}

机构：

[1] Natl Univ Singapore, NUSNNI NanoCore, Singapore 117576, Singapore

[2] Natl Univ Singapore, Dept Phys, Singapore 117542, Singapore

[3] Natl Univ Singapore, Dept Elect & Comp Engn, Singapore 117576, Singapore

[4] Natl Univ Singapore, Dept Mat Sci & Engn, Singapore 119077, Singapore

[5] Univ Dublin Trinity Coll, Sch Phys, Dublin 2, Ireland

[6] Univ Dublin Trinity Coll, CRANN, Dublin 2, Ireland

来源：

ACS APPLIED MATERIALS & INTERFACES | 2015年 / 7卷 / 44期

基金：

新加坡国家研究基金会;

关键词：

two-dimensional electron gas; rutile; anatase; strontium titanate; mobility; bond angles; anisotropic conductivity; GAS; MOBILITY; TRANSISTORS; TRANSITION; BAND;

D O I：

10.1021/acsami.5b06694

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The two-dimensional electron gas in SrTiO3 created by an overlayer of amorphous LaAlO3 is compared with those at the TiO2-terminated surfaces of rutile and anatase. Differences in conductivity are explained in terms of the limiting Ti-O-Ti bond angles (orbital corrugation), band dispersion, and polaron formation. At 300 K, the sheet conductivity and mobility of anatase exceed those for SrTiO3 or rutile by one or two orders of magnitude, respectively. The electrons in rutile become localized below 25 K.

引用

页码：24616 / 24621

页数：6

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