The modification of ferroelectric LiNbO3(0001) surfaces using chromium oxide thin films

Physical Chemistry Chemical Physics : PCCP
M W HerdiechEric I Altman

Abstract

The impact of ferroelectric polarization on the chemical and electronic properties of atomically thin layers of non-polar chromium oxide deposited on positively and negatively poled LiNbO3(0001) was studied. Chromium(III) oxide readily forms on LiNbO3; however, annealing at high temperatures was required to maintain well-ordered films as the thickness increased. Prolonged heating at these temperatures caused Cr diffusion into the LiNbO3 substrate. Comparing Cr 2p X-ray photoelectron spectroscopy (XPS) peak positions as a function of temperature and substrate polarization revealed no evidence of shifts from the peak positions expected for Cr2O3. The lack of any band offset between Cr2O3 on the oppositely poled surface suggests that charge compensation of the ferroelectric substrate occurs at least predominantly at the surface of the film, as opposed to the film-substrate interface. No evidence of shifts due to oxidation or reduction of the Cr was observed indicating that charge compensation did not involve a change in the ionic state of the Cr. Exposing the films to reactive oxygen species emitted from an oxygen plasma, however, caused a distinct high binding energy shoulder on the Cr 2p3/2 XPS peaks that could be associated wit...Continue Reading

References

Jul 15, 1994·Physical Review. B, Condensed Matter·W Y ChingY N Xu
Apr 29, 2005·Nature·B NaranjoS Putterman
May 16, 2007·Physical Review Letters·Alexie M KolpakAndrew M Rappe
Jul 23, 2008·Physical Review Letters·Sergey V Levchenko, Andrew M Rappe
Sep 10, 2011·Physical Review Letters·Seungchul KimAndrew M Rappe

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Citations

Nov 26, 2015·Journal of the American Chemical Society·Chuanhao YaoZhikun Wu
Jul 7, 2016·Physical Chemistry Chemical Physics : PCCP·Arvin Kakekhani, Sohrab Ismail-Beigi
Mar 11, 2017·ACS Applied Materials & Interfaces·Gregory S HutchingsEric I Altman
Apr 28, 2017·ACS Nano·Christian GodauAlexander Haußmann
Dec 1, 2017·Physical Chemistry Chemical Physics : PCCP·Xiaodong ZhuEric I Altman

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