Abstract
The new (1-x) Bi0·5Na0·5TiO3-xCoTiO3-δ ferroelectric semiconductor ceramics were prepared successfully by the solid-state method. The single perovskite structures and long-range polarity order of the (1-x) Bi0·5Na0·5TiO3-xCoTiO3-δ semiconductor ceramics were observed by X-ray diffraction (XRD) and Raman spectra, respectively. The typical relaxation behavior was founded in all the ceramics. The perfect ferroelectric loops and outstanding optical properties were achieved in the (1-x) Bi0·5Na0·5TiO3-xCoTiO3-δ ceramics. A very small optical bandgap (Eg = 1.44 eV) was obtained in the 0.94Bi0·5Na0·5TiO3-0.06CoTiO3-δ ceramic, which is approximately 55% lower than that of pure BNT (Eg = 3.2 eV). The Jsc and Voc of poled 0.94Bi0·5Na0·5 [Ti4+0.71, Ti3+0.29]O2.71-0.06Co [Ti4+0.71, Ti3+0.29]O2.71 ceramic can reach ~ 1.00 nA/cm2 and 0.13 V, respectively. The activation energies of the grains and grain boundaries were calculated to be 0.48 and 0.52 eV, respectively. These results show that the Co substation BNT ceramics highlight a promising candidate for multi-functional photoelectric applications.
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