晶体硅太阳能电池正面银浆的作用机制

正面银浆由银粉、玻璃成分和粘合剂等组成，根据硅光伏电池的电阻构成、正面银浆各组分的特性对烧结时银浆料与硅基体的物理化学变化进行了分析。正面银浆选用密度高的球形银粉，Pb-Te系玻璃，烧结后栅线有足够大的高宽比，增加线条横截面积，使细栅线体电阻(Rf)达到最小值；烧结时还原生成铅和碲单质及其化合物，与硅基体形成共晶导电夹层，使前接触电阻(Rfc)达到最小值；硅太阳能电池的串联电阻(Rs)变小了，光电转换效率就得到提高。

The action mechanism of front silver paste upon crystal silicon solar cells

The front silver paste consists of silver powder, glass composition and adhesive, etc. The physical and chemical changes between the silver paste and the silicon substrate during sintering were analyzed according to the resistance composition of the silicon photovoltaic cell and the characteristics of each component of the front silver paste. The front silver paste is made of high density spherical silver powder and Pb-Te glass. After sintering, the Grid line has a large enough height width ratio to increase the cross-section area of the lines, so that the fine grid wire resistance (Rf) can reach the minimum value. During sintering, lead and tellurium and their compounds are reduced, and forms an eutectic conductive interlayer with the silicon substrate to minimize the front contact resistance (Rfc). The series resistance (Rs) of the silicon solar cell becomes smaller, and its photoelectricity conversion efficiency is improved.