The Study Of Antirelection Flims For SOlar Cells By Ultrason Spray Pyrolysis

The most important issue of photovoltaic research is to improve the photoelectricconversion efficiency of solar cells. However, more than 10% of solar energy in the glasspackage is lost due to reflection. Preparation of anti-reflective film on the glass surface canplay an antireflective role. For the different responses band of different types of solar cells,preparation of the antireflection film can increase the conversion efficiency effectively.In this thesis, the SiO₂/TiO₂ antireflection films for different kinds of solar cells wereprepared by the ultrasonic spray pyrolysis, which has low cost, simple equipment, shortproduction cycle, and the ultrasonic spray model optimized in the practice.In the ultrasonic spray pyrolysis, many process conditions have an influence on thefilms'structure and optical properties, such as the spray distance, the flow rate of carriergas, the choice and flow rate of precursor solution, the temperature of substrate and theheat treatment time, which were studied in this thesis. The most optimal conditions arefound and the optical parameters of thin film materials are determined. We found that thecrystalline nature of the TiO₂ film was anatase, the SiO₂ film was amorphous prepared at500℃, and the corresponding refractive indexs were 2.23 and 1.42 after 10min heattreatment.On the basis of the results of single-layer thin film optical parameters, and through thecombination of the theory of optical thin films and software, double layers anti-reflectivecoating applied for amorphous silicon solar cells and six layers anti-reflective coatingapplied forμc-Si solar cell, a-Si/μc-Si tandem solar cell and crystalline silicon solar cellwere designed and optimized. The average residual reflectance theoretical rates were1.193% and 0.879%.According to the optimization results of the coating, using glass slides as substrates,we prepared two kinds of antireflection films for solar cells, the transmittance of the glassincreased by 10.8% and 10.4%. Through the adhesion test and mechanical test, we foundthat the antireflection films have strong physical properties.