太阳电池用硅片表面钝化研究

Silicon wafer surface passivation for solar cell

硅太阳电池表面钝化是提高其光电转换效率最行之有效的手段之一。介绍了采用氧化表面钝化、发射结钝化、发射结氧化钝化的试验方法钝化太阳电池用硅片表面,通过对钝化后硅片少数载流子寿命的测试结果,发现发射结氧化钝化取得最佳的钝化效果,而硅片的湿氧氧化非但不能起钝化作用,而且降低硅片的有效寿命。在漂移场的作用下,通过饱和硅片表面的悬挂键,可以降低少数载流子在表面的复合,从而得到较好的表面钝化效果。

It is surface passivation that is the most important means to improve the silicon solar cells efficiency.The mechanism and effect of the surface passivation for silicon solar cells were introduced briefly in this paper. Some experiments were taken to develop the optimal effect of various kinds of surface passivation,including oxidation surface passivation,emitter passivation and emitter oxidation passivation. In the experiments, the emitter oxidation passivation got the best passivation effect, and the wet oxidation was proved to have the poorest effect and reduce the effective lifetime of the silicon wafers.The action both of drift fields and suspended bonds saturation reduced the minority carriers' recombination at silicon surface.,which got the passivation effective.