Investigation And Design On The Grating Based Solar Cells

Low light harvesting efficiency of the solar cell greatly reduces its photoelectric conversion efficiency. The external efficiency of various light-harvesting structures are used to increase the solar cell.In this article, the photonic crystal structure used to increase light-harvesting efficiency of the solar cell. This paper first proposed the research status of this topic, as well as the problem to be solved, after a proposed solution to the problem. And the results compared with the authoritative literature, verify the correctness of the programmed model. After theoretical simulation model, and get a good, reliable results expected.1A design is proposed to significantly increase the absorption of gallium arsenide thin-film layer. This is achieved by patterning a grating in this layer.By using rigorous coupled wave method, the absorption efficiency in the range of300-900nm has been analyzed for GaAs layer with rectangular and triangle gratings. The results show that the absorption efficiency of the two structures can be improved relative to the flat absorption layer and the peak absorption rate can be increased by55.9%. And the structural parameters of the two structures have been also optimized. By analyzing the incident angular dependence of the two structures, it is concluded that solar cells with the triangular absorption layer have better characteristics in the same condition of thickness and filling factor. On the other hand, the finite element method is used to calculate the field distribution for different absorption layers. Good absorption enhancement can be observed directly from the absorption layer with gratings. The research provides a reference basis for the preparation of solar cell structures with high performance.2Alternative to traditional metal northern reflector with a back reflector layer of the photonic crystal, the absorption wavelength for a hydrogenated amorphous silicon, and to calculate and optimize the band gap of the back reflector layer of the photonic crystal structure through the the special clinic matrix method, the results show, when the photonic crystal The number of cycles is5:00, its first forbidden band of visible light coincides with hydrogenated amorphous silicon absorption range matching. To achieve this cell absorbs light within the wavelength range of100%reflective.14%higher than traditional metal back reflector reflectivity.This paper first proposed the research status of this topic, as well as the problem to be solved, after a proposed solution to the problem. And the results compared with the authoritative literature, verify the correctness of the programmed model. After theoretical simulation model, and get a good, reliable results expected.