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SEM image [(a) and (b)] and XRD patterns [(c) and (d)] after photochemical treatment on and , respectively. The inset in (d) shows the XRD pattern after the photochemical treatment on . A layer effectively changed the direction of the chemical reaction, turning oxidation to reduction. “x” refers to the substrate, “” refers to , and “o” refers to .
(a) Schematic illustration of the junction polarity defined as positive when a positive voltage is applied to the Pt top electrode. (b) The impact of UV illumination on the characteristic properties of .
(a) characteristic of under and without UV illumination. (b) Pyroelectric hysteresis loop measured by the Chynoweth method. (c) Photoresponse of the short-circuit current for the junction under intensity modulated UV illumination. The red and blue color refer to positively and negatively polarized ferroelectric domains, respectively.
(a) Pyroelectric hysteresis loop of the junction. (b) The photoresponse of the short-circuit current from positively and negatively polarized domains under intensity modulated UV illumination.
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