xTeO_2-(98-x)PbO-2Bi_2O_3玻璃的结构表征及在硅太阳能电池正面银浆中的应用

Structural Characterization of xTeO_2-( 98-x) PbO-2Bi_2O_3 Glasses and the Application in Front Silver Paste of Silicon Solar Cell

采用熔体冷却法制备了xTeO2-(98-x)PbO-2Bi2O3(x=40mol%、45mol%、50mol%、55mol%、60mol%)玻璃试样,利用红外和拉曼光谱对玻璃结构随TeO2含量的变化进行了分析,同时研究了TeO2含量对玻璃软化温度(Tf)、热膨胀系数(α)及化学稳定性(DR)的影响;将以上玻璃粉与银粉以及有机载体按一定比例配制成银浆,在硅基片正面经丝网印刷和快速烧结制得正面电极,研究了玻璃粉对硅基片表面所镀减反膜的腐蚀效果以及正面电极附着力(T)和电阻率(ρ)的影响。结果表明:随着TeO2含量的增加,玻璃主要结构单元逐渐由[TeO3]三角锥和[PbO4]四方锥体转变为[TeO4]三角双锥,当x=55mol%时,主要结构单元为[TeO3]三角锥和[TeO4]三角双锥,此时碲酸盐玻璃的综合性能良好:Tf=540℃,α=16×10-6/℃,DR=6.5605×10-8g.cm-2.min-1玻璃粉对减反膜的腐蚀作用较明显,正面电极与硅基片附着力较大,电阻率较低,T=4.4 N,ρ=2.617μΩ.cm。

Glass samples of xTeO2-（98-x） PbO-2Bi2O3（x = 40mol%,45mol%,50mol%,55mol%,60mol%） were prepared by a melt quenching method.The structural changes of glasses were analyzed using Infrared and Raman Spectra.The effects of TeO2 content on the softening temperature,thermal expansion coefficient and chemical durability of the samples were investigated.The silver paste was fabricated by uniformly mixing with silver power,glass frit and organic carrier at a certain ratio.Then the front contact silver electrodes of solar cells were made through silk-screen printing and rapid sintering by silver paste.The effects of glass frit on the corrosion of antireflection coating,silver film adhesion force and resistivity were analyzed.The results indicate that the basic structural units change from TeO3 trigonal pyramid and PbO4 square pyramid to TeO4 trigonal bypyramid with increasing content of TeO2.When the TeO2 content is 55mol%,the dominating structural unit is TeO3 trigonal pyramid and TeO4 trigonal bypyramid,and the tellurite glass has excellent performance（Tf = 540 ℃,α = 16 × 10-6/ ℃,DR = 6.5605 × 10-8 g.cm-2.min-1）.What＇s more,the corrosion effect of glass frit on antireflection coating is obvious,the silver film adhesion force is big and the resistivity is low（T = 4.4 N,ρ = 2.617 μΩ.cm）.