Study On The Effect Of Glass Surface Modification Structure On Enhancing Solar Cell Efficiency

With the rapid development of the global industry, energy sources are in high demand and abundant exploitation of natural fossil fuel results in more and more serious environmental pollution. The research and development on clean energy have gotten more attentions. The research on solar cells is not only particular popular but also hot at home and abroad. Electricity is the essential energy source in the information era. Yet the source of electricity is mainly from the coal combustion. In order to get clean energy by simple approach in the most districts, solar cells become a best choice. For a long time, the main study of solar cells emphasizes on two parts:One is to improve the efficiency of solar cell, and the other is to reduce the cost of the battery. At the present stage, improving the efficiency of solar cell hits a bottleneck:there is no breakthrough on the efficiency of solar cell, which results from the limit of the existing materials. So it’s difficult to achieve a breakthrough from materials to improve the efficiency of solar cell. In that case, more and more people pay attention to other methods. For example, sunlight can be induced into the active layer of solar cell, which can increase the possibility of photoelectric conversion and improve the efficiency of solar cell. Considering these problems, based on the relationship between silica and hydrofluoric acid, this work is to employ the chemical bath to modify the surface of glass. It’s important to solve the problems above in the practice application.This study includes the following three aspects:1) Preparing potassium fluoride and inorganic acid with different concentration ratio. Based on the reaction principle between the hydrofluoric acid prepared by potassium fluoride and inorganic acid and silica on the surface of glass, the surface of glass can be modified once and twice to achieve different textured structure. Surface morphologies are examined by a scanning electron microscope. The reflection propertiy and transmittance propertiy of glass are measured by UV-VIS-NIR spectrophotometer. The results reveal that surface morphologies and optical properties depend on concentration, time, inorganic acid, and buffer agent, et al. Especially, the addition of buffer agent can influence surface morphology and size considerably. For example, the isopropanol can decrease the size of unit structure, and the hydrogen peroxide can increase the size of unit structure, and hydrochloric acid can be replaced by nitric acid to achieve flower-like modified structure. The surface morphology of modified glass is uniform like-pyramid structure, and the surface morphology of twice modified glass is pyramid hybrid structure. The results suggest that the transmittance in the visible and near infrared region increases by2%when the molar concentration ratio of potassium fluoride and hydrochloric acid is3:2and the reaction time is180s, which is the best modified condition.2) The glass cover-plate of amorphous-silicon thin-film solar cell is modified using the conditions above. The molar concentration ratio of potassium fluoride and hydrochloric acid is3:2and the reaction time is180s. The size of unit structure can be changed by adding different buffer agent and different volume ratio of buffer agents. The size of pyramid can be tuned from hundreds of nanometer to twenty microns. In order to understand the performance of solar cell further, the J-V characterization of solar cell is measured by Solar Simulator and External Quantum Efficiency. Compared with non-modified solar cell, the photoelectric conversion of modified solar cell increases. The efficiency increases as high as1.15%, and this condition is coordinate with the best condition used to modify surface of glass.3) Using Plasma Enhanced Chemical Vapor Deposition (PECVD) to prepare the solar cells on the modified glass with different surface morphologies and optical properties. The results suggest that, in comparison to the non-modified glass, the solar cell with like-pyramid structure glass has an obvious effect on the photovoltaic characterization of solar cell, and the efficiency of solar cell increases by1.46%. Other structures, such as flower-like structure, pyramid hybrid structure and flower-like hybrid structure, have different effect on the improvement of the photovoltaic characterization of solar cells.