UM
Mechanism of insulator-to-metal transition in heavily Nb doped anatase TiO 2
Tao J.1; Pan H.2; Wong L.M.1; Wong T.I.1; Chai J.W.1; Pan J.1; Wang S.J.1
2014-03-01
Source PublicationMaterials Research Express
ISSN20531591
Volume1Issue:1
AbstractHeavily Nb-doped anatase TiO (TNO) thin films were prepared by pulsed dc magnetron sputtering using an Nb-doped TiO target. The as-grown films exhibit high resistivity whose resistance decreases by 2104-fold upon vacuum annealing. The 40% Nb-doped anatase TiO film shows a low resistivity of 5.7 10-4 cm and a high electron concentration of 3.07 1021 cm-3. Combined in situ x-ray photoelectron spectroscopy (XPS) measurement and density-functional theory (DFT) calculations show that oxygen interstitial (Oint) and Nb interstitial (Nbint) defect clusters introduce localized shallow p-type accepter states that trap the electrons and reduce the conductivity. These defect clusters can be eliminated by vacuum annealing which is companied by outward diffusion of Nb. As a result, the trapped electrons backfill the Ti sites which are delocalized to promote conductivity.
KeywordDensity-functional theory Nb-doped anatase TiO 2 Transparent conducting oxide X-ray photoelectron spectroscopy
DOI10.1088/2053-1591/1/1/015911
URLView the original
Language英語
Fulltext Access
Citation statistics
Cited Times [WOS]:7   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.A-Star, Institute of Materials Research and Engineering
2.Universidade de Macau
Recommended Citation
GB/T 7714
Tao J.,Pan H.,Wong L.M.,et al. Mechanism of insulator-to-metal transition in heavily Nb doped anatase TiO 2[J]. Materials Research Express,2014,1(1).
APA Tao J..,Pan H..,Wong L.M..,Wong T.I..,Chai J.W..,...&Wang S.J..(2014).Mechanism of insulator-to-metal transition in heavily Nb doped anatase TiO 2.Materials Research Express,1(1).
MLA Tao J.,et al."Mechanism of insulator-to-metal transition in heavily Nb doped anatase TiO 2".Materials Research Express 1.1(2014).
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Tao J.]'s Articles
[Pan H.]'s Articles
[Wong L.M.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Tao J.]'s Articles
[Pan H.]'s Articles
[Wong L.M.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Tao J.]'s Articles
[Pan H.]'s Articles
[Wong L.M.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.