太阳电池电极与铝背场烧结过程的数值模拟分析

Numerical Simulation on Sintering Process of Solar Cell Electrode and Aluminum-Alloyed Back Surface Field

在太阳电池的生产中,由于硅材料与各种电极浆料热膨胀系数不匹配,导致太阳电池在烧结过程中产生残余应力,严重影响到产品质量和成本。采用有限元法对电池电极烧结过程进行数值模拟研究,分析由于硅与电极热膨胀系数不匹配引起的弯曲问题以及电池片烧结过程中产生的残余应力分布情况。讨论了硅片层厚度和铝背场厚度对电池片弯曲度的影响,并对电池片在不同弯曲度下的应力状态进行了分析,对如何提高产品的成品率提出了改进措施。

In the production of the solar cells, since the mismatch of heat expansion coefficients between silicon and various electrode materials, the residual stresses thus caused during the sintering process have significant influence on the quality and the cost of the products. Numerical simulation was carried out on the sintering process of the cell electrode by the finite element method, to analyze the bend problem and to obtain the distribution of residual stress. The impact was discussed on the thicknesses of silicon material and aluminum-alloyed back surface field on the bend level of the cell, and the stress state of cells under different bend levels was investigated, hence advanced measures to enhance finished product rate were proposed.