基于太阳能电池增效的硅酸盐波长转换荧光材料-微电子学与固体电子学专业论文.docxVIP

II II Abstract With its rapid development of economy, the steadily increased energy consumption results in the short of energy supply. It is urgent to search for renewable energy. Solar Energy has a character of green, safe, pollution-free and Inexhaustible. Solar cell, a direct way to use solar energy, has arising much attention. It has been widely used in many fields such as aeronautic and electrical equipments. At present, the photoelectric conversion efficiency of solar cell is relatively low for its narrow absorption band. It fails to effectively absorb the high frequency ultraviolet light and low frequency infrared light. Ultraviolet light and infrared light which accounted about 3 percent and 53 percent of sunlight can’t be effectively absorbed by solar cell. If these energys could be used in solar cell, it will play a great role in increasing the efficiency. A simple and practical way is to coating light conversion materials to the solar cell. These materials can convert the sunlight that can’t be absorbed by cells into the available light. It includes high frequency ultraviolet light conversion and low frequency infrared conversion, i.e. downconversion and uponversion. Firstly, Zn2SiO4:Yb3+, Er3+ phosphors, prepared by microwave method, can convert the infrared light to red and green light. In order to enhance the emission intensity, Li+ and Bi3+ ions are introduced to Zn2SiO4:Yb3+, Er3+ phosphors. The introduced Li+ ions makes the upconversion green light intensity increased by six times and the red one increased by three times，respectively. Proper amount of Bi3+ ions makes both of the red and green emission intensities increased by 20 times. Spectral probing method with Eu3+ is used to discuss the reason for the improvement. Secondly, Zn2SiO4:Mn2+, prepared by solid-state reaction method, can efficiently absorb high-energy ultraviolet light and blue light and convert into green light, increasing the photoelectric conversion efficiency. In order