Effect of annealing atmosphere on defects, light absorption and imprinting properties of Bi4Ti3O12 films

In order to studying the effect of the annealing atmospheres (nitrogen and air) on the films, two kinds of Bi4Ti3O12 (BIT) samples were prepared by the sol-gel and layer-by-layer thermal annealing method. Various factors, including lesser V-O(center dot center dot), more V-Bi '' and greater grain size in the air-annealed samples, interacted on the ferroelectric and light absorption properties. However, more (V-Bi '') - (V-O(center dot center dot)) reinforced the imbalance of electron capture in the ITO/BIT/Au capacitors, resulting in stronger imprinting. And the arrangement of (V-Bi '') - (V-O(center dot center dot)) and the domain pinning in the air-annealed films resulted in more serious aging effect.