Sensitizing Tungsten Trioxide Surface Enhancing Photoelectric Conversion

The use of surface sensitized method to improve the photoelectric conversion efficiency. The material must be supported on tungsten trioxide (WO₃) semiconductor surface, thereby improving the light absorption and conversion capabilities. The surface sensitized principle is quite similar to semiconductor composite, but the light absorption by the conversion of primary tungsten oxide material turn into photosensitizer and photosensitizer, which must meet two requirements: (1) the band gap must is less than WO₃; (2) the position of conduction band generally lost WO₃ conduction band. It has now been found to meet the conditions by using a semiconductor mainly Fe₂O₃, Cu₂O, CdS, etc.

Semiconductor composite improves the photoelectric conversion performance of WO₃. Semiconductor composite are two or more semiconductors by physical or chemical combination, which is relatively common, particular way of effectively to enhance the performance of the material. In order to improve the photoelectric conversion performance, composite machine generally is used as metal oxide, in short, which enables the photo-generated electrons or holes by compound semiconductors. It is gathered in two semiconductor conduction band or the valence band, so that electron and hole separated, thus improving the photoelectric conversion efficiency. In order to enhance the photoelectric conversion efficiency of the semiconductor, the use of metal oxides also using probability electron transfer media, which can improve the speed of migration of electrons in semiconductor material while reducing green light to stay in the complex.