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High-temperature conductivity evaluation of Nb doped SrTiO3 thin films: Influence of strain and growth mechanism.
- Source :
-
Thin Solid Films . Jul2013, Vol. 539, p384-390. 7p. - Publication Year :
- 2013
-
Abstract
- Abstract: Doped SrTiO3 thin films, 55nm thick, were epitaxially grown by Pulsed Laser Deposition with niobium contents ranging from 2 to 5mol% on SrTiO3 and LaAlO3 substrates. The different templates result in different growth defects, film growth mechanism and therefore a different volume fraction of uniformly strained film under the critical thickness. The investigation of the conductivity reveals a significant difference between the two substrate choices, but only at elevated temperatures with conductivity values up to 30% larger for films on SrTiO3 substrates compared with LaAlO3. Whereas in bulk ceramics the niobium level dictates the total conductivity, here it was found that the substrate choice had a greater influence for thin films, in particular at temperatures over 400°C. This finding provides important information on conductive layers in complex heterostructures where strain and defects could work cooperatively. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00406090
- Volume :
- 539
- Database :
- Academic Search Index
- Journal :
- Thin Solid Films
- Publication Type :
- Academic Journal
- Accession number :
- 89307011
- Full Text :
- https://doi.org/10.1016/j.tsf.2013.05.094