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High resolution XRD data (a) and TEM image (b) of the as-grown STO film.
PL spectrum of the postannealed STO films taken at room temperature. PL data of the as-grown film is shown together. The insets in the three panels show the PL images taken with a digital camera during the laser excitation.
PL data of the STO films after the low-T and long-term annealing of Sample 1 and two pieces of Sample 3 (3–1 and 3–2). The curves are shifted equally in the vertical axis.
Four different conditions used in the postannealing of the as-grown STO films.
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