背电极面积优化对非晶硅太阳能电池的影响

Influence of Back Electrode Area Optimization on a-Si Solar Cells

光伏发电技术中,非晶硅薄膜太阳能电池由于其高透光性、弱光发电、价格低廉等优势被广泛使用。在工业化量产中通过背电极面积优化以提高非晶硅薄膜太阳能电池发电效率等性能的研究还未见报道。本文以蓬安金石光电科技有限公司的5020-9型电池为研究对象,探讨了在PECVD镀膜工艺和背电极丝网印刷方式下背电极设计对非晶硅太阳能电池性能的影响。结果表明,在限定外形尺寸为50 mm×20 mm且必须为9结(PIN结)串联的条件下,背电极优化后的电池表现出较好的光电转化性能,其短路电流、开路电压、最大功率、填充因子平均值分别为7.13 mA、7.04 V、12.41 mW、25.36%。相比于原设计方案,短路电流在原基础上提高约47%,良品率提高约58%。本文还指出集成型电池背电极设计的基本原则:尽量保证各单结背电极面积相等,以提高整体电流匹配程度;优化激光蚀刻线相对位置提高活性区面积。

In photovoltaic power generation technology, amorphous silicon thin film solar cells are widely used because of its high light transmittance, low light power generation, low price and other advantages. The research on improving the efficiency of amorphous Si thin film solar cells by optimizing the back electrode area has not been reported in industrial production. In this paper, the 5020-9 battery of Pengan Jinshi Solar Cell Technology Co., Ltd. is taken as the research object, and the influence of back electrode design on the performance of amorphous silicon solar cell under PECVD coating process and back electrode screen printing mode is discussed. The results show that under the condition that the boundary dimension is 50 mm×20 mm and 9-junction(PIN junction) must be connected in series, the optimized back electrode battery shows better photoelectric conversion performance. The average values of short-circuit current, open circuit voltage, maximum power and filling factor are 7.13 mA, 7.04 V, 12.41 mW and 25.36%, respectively. Compared with the original design, the short-circuit current increases about 47%,and the yield increases about 58%. The basic principles of the back electrode design of integrated battery are as follows: to ensure the area of each single back electrode is equal as far as possible, so as to improve the overall current matching degree;to optimize the relative position of laser etching line and increase the area of active area.