超低减反纳米结构对晶体硅太阳电池性能的影响

THE INFLUENCE OF THE SURFACE NANOSTUCTURE WITH EXCELLENT ANTI-REFLECTION PROPERTIES TO THE CRYSTAL SILICON SOLAR CELL'S CHARACTERISTICS

介绍了一种利用湿法化学腐蚀方法在125mm×125mm硅衬底上制备的具有超低光学减反的效率为12.68%的纳米线表面结构太阳电池。除了表面结构的制备过程,该电池其余的工艺均采用传统生产线工艺(包括铝背场的制备、负电极的制备)。在300～1000nm波段,纳米线结构的反射率低于3%;同时相比金字塔绒面结构,吸收率也提高了近10%。根据外量子效率测试,分析了所制备电池的基本性能,并讨论了纳米表面结构太阳电池比传统金字塔绒面电池效率低的原因。分析表明,合适的钝化及电极制备工艺对纳米表面结构电池性能的提高具有十分重要的作用。

The paper introduce a 12.68% silicon nanowire solar cell with excellent anti-reflectance ability synthe- sized on 125mm ×125mm silicon substrate using wet chemical etch method. The fabrication process including Al- back surface field and metal grid formation are conventional industry technique except surface texture. The reflec- tance measurement was used to scale the reflectance ability of silicon nanowire, and the lowest reflectance of less than 3% is achieved in wavelengths 300-1000nm. The absorption of silicon nanowire is improved nearly 10% com- pared with pyramids textured surface. According to external quantum efficiency measurement, we analyzed the bas- ic parameters of the solar cells made by us. Also we discuss the reason why the efficiency of silicon nanowire solar cell is lower than the pyramids textured solar cells. We conclude that proper passivation and metal contact fabrica- tion technique is very important for nanostructure solar cells.