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Oxygen Partial Pressure during Pulsed Laser Deposition: Deterministic Role on Thermodynamic Stability of Atomic Termination Sequence at SrRuO3/BaTiO3 Interface
journal contribution
posted on 2017-07-21, 00:00 authored by Yeong Jae Shin, Lingfei Wang, Yoonkoo Kim, Ho-Hyun Nahm, Daesu Lee, Jeong Rae Kim, Sang Mo Yang, Jong-Gul Yoon, Jin-Seok Chung, Miyoung Kim, Seo Hyoung Chang, Tae Won NohWith
recent trends on miniaturizing oxide-based devices, the need for atomic-scale
control of surface/interface structures by pulsed laser deposition
(PLD) has increased. In particular, realizing uniform atomic termination
at the surface/interface is highly desirable. However, a lack of understanding
on the surface formation mechanism in PLD has limited a deliberate
control of surface/interface atomic stacking sequences. Here, taking
the prototypical SrRuO3/BaTiO3/SrRuO3 (SRO/BTO/SRO) heterostructure as a model system, we investigated
the formation of different interfacial termination sequences (BaO–RuO2 or TiO2–SrO) with oxygen partial pressure
(PO2) during PLD. We found
that a uniform SrO–TiO2 termination sequence at
the SRO/BTO interface can be achieved by lowering the PO2 to 5 mTorr, regardless of the total background
gas pressure (Ptotal), growth mode, or
growth rate. Our results indicate that the thermodynamic stability
of the BTO surface at the low-energy kinetics stage of PLD can play
an important role in surface/interface termination formation. This
work paves the way for realizing termination engineering in functional
oxide heterostructures.
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Keywords
5 mTorrP O 2Pulsed Laser Depositiontermination engineeringSrRuOtermination sequencesoxide heterostructuresAtomic Termination Sequencelow-energy kinetics stageOxygen Partial PressureThermodynamic Stabilityatomic-scale controlsurface formation mechanismSRObackground gas pressurePLDDeterministic Rolelaser depositionBTO surfaceminiaturizing oxide-based devicesgrowth ratemodel system