Polar compensation at the surface of SrTiO3 (111)
Mohammad Saghayezhian, Lina Chen, Gaomin Wang, Hangwen Guo, E.W., Plummer, and Jiandi Zhang
TL;DR
This study explores how annealing temperature and oxygen processing influence the surface composition and structure of SrTiO3 (111), identifying optimal conditions for surface stability and film growth.
Contribution
It systematically analyzes the effects of annealing on SrTiO3 (111) surfaces, revealing conditions to maintain surface structure and optimize surface composition for epitaxial growth.
Findings
Maximum Ti/Sr ratio at a specific annealing temperature
Surface reconstruction can be avoided with proper processing
Optimal temperature window identified for film growth
Abstract
We have systematically investigated the annealing effect on the structure and composition of the polar surface of SrTiO3 (111), starting with an ex-situ chemical etch. The relative surface concentration between Ti and Sr strongly depends on both the annealing temperature and the oxygen processing. There is a critical annealing temperature at which the maximum concentration ratio of Ti to Sr is achieved, while still maintaining a (1 x 1) surface structure. We demonstrate that with proper processing it is possible to avoid surface reconstruction over a broad temperature range. Our results provide an optimal temperature window for epitaxial film growth.
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