Research On Photoelectric And Pyroelectric Coupling Nano-generator Based On Ferroelectric Materials

As a commonly used functional material,ferroelectric materials are widely used in various aspects of people's production and life.Self-driven micro and nanoelectronic devices such as pyroelectric nanogenerators and photovoltaic devices for converting energy as built-in power supply have become the focus of research.The study of ferroelectric material-based nanogenerators is of great significance for improving energy utilization in limited space,however,the research on ferroelectric material-based coupled nanogenerators is limited and the interactions between various effects in the devices are not well studied.In this paper,ferroelectric ceramics based on sodium bismuth titanate(Bi_0.5Na_0.5Ti O₃,BNT)material were firstly prepared by solid-phase sintering method,and lead-free piezoelectric ceramics with different components of barium titanate(Ba Ti O₃,BT)doping were systematically investigated.The effects of different doping contents on the electrical properties of BNT,such as physical phase structure,ferroelectricity,piezoelectricity and dielectricity,were systematically investigated.Then the ferroelectric ceramics with different components of BNT-BT were prepared into devices,and the effects of different components of ceramic devices subjected to different light and heating and cooling conditions were explored.Finally,the BNT ferroelectric ceramic devices were confirmed as the main material for exploring multifunctional self-driven nanogenerators.Secondly,based on the photoelectric and pyroelectric properties of the BNT ferroelectric material itself,we have constructed a multifunctional self-driving coupled nano-generator that can collect both light and heat at the same time,and use the ferroelectric-pyroelectric-photoelectric effect to improve the output current of the self-driving coupled nano-generator is calculated.The interaction between various effects in BNT materials and the factors affecting the photoelectric performance of the device were systematically studied by adjusting the experimental conditions.Through the combined effect of light and heating,the output performance of the nanogenerator is improved.The photocurrent of the ITO/BNT/Ag device when heated under a temperature gradient of 16.3 K can reach 1.88?A under 405 nm(156.05 m W cm^-2)irradiation,which is 126%higher than room temperature.The above work explores the detection of different wavelengths of light by different components of BNT-BT ferroelectric ceramics,followed by the detection of near-ultraviolet light by using the coupling of ferroelectric-pyroelectric-photovoltaic effect in the photoelectric process of BNT materials.This not only opens a new way to improve the performance study of ferroelectric material photodetectors,but also expands the application field of self-driven photodetectors.