Experimental study demonstrates tunable optical absorption and photoconductivity in Sm/Ni co-doped PMN-PT ceramics, indicating potential for multimodal piezoelectric energy harvesting.
The ability to manipulate the bandgap while maintaining strong ferroelectricity in perovskite oxides offers numerous functional advantages, including multimodal energy harvesting/sensing, current modulation, dual-source actuation, electric-free poling, and enhanced bulk photovoltaic effect. However, bandgap engineering of Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT) – renowned for its outstanding piezoelectric properties – via Ni 2+ doping remains unexplored, despite its prior success in alkaline niobates. This study provides a comprehensive characterization of the structure-property relationships in Sm/Ni co-doped PMN-PT ceramics, especially for their optoelectrical properties. The results show that Ni 2+ doping behaves differently than in alkaline niobates. Nevertheless, Sm/Ni co-doping effectively tunes the phase transition, photoconductivity, charge carrier trapping, and optical absorption while retaining reasonable piezoelectric energy harvesting performance. Overall, this work offers insights into the role of Ni 2+ in the band structure of Sm-PMN-PT perovskite and pyrochlore phases.
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Aias et al. (2026) studied this question.
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