Te-Bi玻璃对晶体硅太阳能电池正银电极性能的影响

正银浆料是晶体硅太阳能电池金属化的关键材料, 环保型浆料是正银电极的主要发展方向之一。通过正交实验方法, 研究了不同配方和组分的Te-Bi玻璃对正银电极性能的影响。用TGA-DSC分析了Te-Bi玻璃和正银浆料的热处理特性, 用SEM分析了Ag-Si界面处银微晶的分布和大小, 利用隧道电流模型分析了玻璃对正银电极性能的影响规律。结果表明: TeO₂含量45wt%, Bi₂O₃含量36wt%的Z7玻璃, 其T_g为379.07℃, 对应的正银浆料在612.8℃出现吸热反应, 同时发生失重(-0.16%), 制作的多晶硅电池效率达到16.87%, 电极的附着力达到4.35 N。

Effects of Te-Bi Glass Frit on Performances of Front Silver Contacts for Crystalline Silicon Solar Cells

Front silver paste is a key material for metalization of crystalline silicon solar cells. Environmental-friendly paste is one of the main development direction for the front silver contacts. The effects of Te-Bi glass frits with different formulations and components on the performances of front silver contacts were studied by orthogonal experimental method. The heating characteristics of Te-Bi glass frit and front silver pastes were analyzed by TGA-DSC. Size and distribution of the silver microcrystalline on Ag-Si interface were observed by SEM. The influence of glass on the performances of the front silver contacts was analyzed by using tunneling current model. The results show that the transition temperature (T_g) of Z7 glass frit composed of 45wt% TeO₂ and 36wt% Bi₂O₃ is 379.07℃. The endothermic reaction of corresponding paste occurs at 612.8℃ with 0.16% weight loss occurring at the same temperature. The efficiency of polycrystalline silicon solar cells using the corresponding front silver paste is 16.87%, and adhesion of the cell is 4.35 N.