The formation of a ½ monolayer (ML) of strontium (Sr) on Si(001) represents the most widely used and effective passivation procedure for the epitaxial growth of strontium titanate (SrTiO3) on Si with molecular beam epitaxy (MBE). In the present study, we demonstrate experimentally the possibility of preparing such a buffer layer with the pulsed-laser deposition (PLD) technique. In-situ analysis using reflection high-energy electron diffraction (RHEED) showed surface structure evolution from two-domain (2 × 1) + (1 × 2), exhibited by the bare silicon surface, to a (3 × 2) + (2 × 3) structure at 1/6 ML Sr coverage, which is then replaced by (1 × 2) + (2 × 1) structure at ¼ ML and maintained up to ½ ML coverage. In addition, two different processes for the removal of native silicon dioxide (SiO2) layer were studied: thermal and Sr-induced deoxidation process. Annealing above 1100 °C proved to be the most efficient in terms of carbon contamination. The results highlight the possibilities of using the PLD technique for the synthesis of an epitaxial SrTiO3 layer on Si, needed for the integration of different functional oxides with a Si platform.
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16 February 2015
Research Article|
February 19 2015
Formation of a strontium buffer layer on Si(001) by pulsed-laser deposition through the Sr/Si(001)(2 × 3) surface reconstruction
D. Klement;
D. Klement
a)
1Advanced Materials Department,
Jožef Stefan Institute
, Jamova cesta 39, 1000 Ljubljana, Slovenia
2
Jožef Stefan International Postgraduate School
, Jamova cesta 39, 1000 Ljubljana, Slovenia
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M. Spreitzer;
M. Spreitzer
1Advanced Materials Department,
Jožef Stefan Institute
, Jamova cesta 39, 1000 Ljubljana, Slovenia
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D. Suvorov
D. Suvorov
1Advanced Materials Department,
Jožef Stefan Institute
, Jamova cesta 39, 1000 Ljubljana, Slovenia
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a)
Author to whom correspondence should be addressed. Electronic mail: dejan.klement@ijs.si
Appl. Phys. Lett. 106, 071602 (2015)
Article history
Received:
October 07 2014
Accepted:
February 12 2015
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Citation
D. Klement, M. Spreitzer, D. Suvorov; Formation of a strontium buffer layer on Si(001) by pulsed-laser deposition through the Sr/Si(001)(2 × 3) surface reconstruction. Appl. Phys. Lett. 16 February 2015; 106 (7): 071602. https://doi.org/10.1063/1.4913464
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