一种用于太阳能电池背电极的超细球形铝粉浆料

采用具有不同粒径级配的球形铝粉制备了能够与硅片形成性能良好太阳能电池背电极的铝浆,并在硅片上制备了铝电极膜。研究了铝粉粒径级配对铝电极膜性能的影响。结果表明:随着超细球形铝粉(0.5~2.0μm)含量的增多,铝电极膜层的填充性、致密性得到了增强,太阳能电池的光电转换效率η得到了提高;与不含超细球形铝粉的样品相比,w(超细球形铝粉)为8%时的太阳能电池的η提高了约4%。超细球形铝粉含量过多(如15%)时,铝电极膜表面容易析出铝珠,电极膜机械强度降低甚至出现灰化脱落。

Aluminum paste containing ultrafine spherical aluminum powaer used for solar cell back electrode

Aluminum paste applicable for the fabrication of high performance solar cell back electrode was prepared with spherical aluminum powders with different particle size distribution. And, aluminum electrode films were prepared on the silicon wafer. The effects of particle size distribution of aluminum powder on the performance of the aluminum electrode film were studied. The results show that, with the increase of the content of ultrafine spherical aluminum powder (0.5~2.0 μm), more and more spaces among the aluminum powders are filled and the compactness of the electrode film is increased, and the photoelectric conversion efficiency η of solar cells is enhanced. Compared with samples without ultrafine powder, the η of solar cells fabricated with the aluminum paste containing 8% (mass fraction) ultrafine powder is increased by 4%. However, adding too much ultrafine powder (for example 15% mass fraction) always results in the formation of aluminum beads on the surface of the electrode film, reduction in the mechanical strength or even peeling off of the electrode film.