Synergetic utilization of 3D materials merits and unidirectional electrons transfer of Schottky junction for optimizing optical absorption and charge kinetics

Abstract

Despite plenty of works involve in Schottky junction to optimizing charge kinetics have been researched, some issues still bother us. For example, why photo-excited electrons transfer from semiconductor to metal in Schottky junction, and can we realize the formation of Schottky junction is the nature property of materials and unrelated to light, etc. To analyze the mechanism of Schottky junction, a novel 3D weed g-C3N4/flowerlike NiS composite (TCN/NiS) was designed. The existence of Schottky junction was proved by DFT calculations. The high charge separation efficiency in TCN/NiS was reflected in the photo-electrochemical characterization, and was also verified by the photocatalytic degradation of a representative organophosphorus pesticides chlorpyrifos with a high degradation efficiency of 86 %. Especially, about how and why the energy band of TCN bending, and why photo-excited electrons transfer from TCN to NiS were explained elaborated. The deep understanding of Schottky junction helps to construct high efficiency photocatalysts.