| Abstract Scope |
In recent years, narrow band gap photoferroelectrics that are both ferroelectric and visible light responsive, have been developed and attracted attentions in both insulating ferroelectrics/piezoelectrics and semiconductor research. The generation of photo-excited charge carriers upon absorbing visible light in ferroelectric materials offers an additional degree of freedom to manipulate polarizations and domains, realizing combinations of functionalities when subject to optical, electrical, mechanical and thermal stimuli in a single material. In this talk, such functionality combinations for multi-source energy harvesting and sensing applications based on a narrow band gap photoferroelectric material, KNBNNO ((K,Na,Ba)(Nb,Ni)O3-δ), carried out in our group in the recent five years will be reviewed. Emphasis will be put on the discussions of how manipulation of domain wall motion with two or more energy inputs can increase the performance of an energy harvester or sensor. |