【作者】 韩晓艳；

【导师】 李养贤；

【作者基本信息】 河北工业大学 ， 材料物理与化学， 2006， 硕士

【摘要】 要提高硅基薄膜太阳电池的普及率,必须降低硅基薄膜太阳电池的生产成本、提高其稳定效率,其中稳定性是制约硅基薄膜太阳电池进一步发展的主要因素。至今为止,非晶硅太阳电池中存在的光致衰退(SW)效应,另外开始被认为没有衰退问题的微晶硅太阳电池在近期的研究中也发现存在自然衰退,同样也有SW效应,所以必须对它们的稳定性问题进行研究从而获得高的稳定效率。本文主要完成了以下工作: 1.研究不同晶化情况本征硅薄膜材料的光衰退现象,监测光衰退前后材料的光、暗电导率、输运特性及吸收谱随衰退时间的变化规律及退火恢复情况,结果表明过渡区非晶硅稳定性好于普通非晶硅材料,适于制备稳定非晶硅电池;过渡区微晶硅材料的光电特性更适于制备微晶硅电池,但与高晶化率微晶硅材料相比并不是完全不衰退的。 2.利用改变硅烷浓度(SC)的方法制备了一系列不同晶化率的微晶硅太阳电池,并将电池在红光和白光两种光源下进行光照实验。测试光照前后电池光、暗态J-V特性,量子效率(QE)及拉曼(Raman)谱的变化,结果表明微晶硅薄膜中的非晶相主要存在于孵化层中,且是引起电池衰退的主要原因。 3.对a-Si/a-Si叠层太阳电池的光衰退特性进行研究。分别对顶电池和底电池稳定性及电流匹配进行了研究,给出了具有较好稳定性的a-Si/a-Si叠层太阳电池应具备的条件。对a-Si/a-Si叠层太阳电池长期稳定性模型进行研究,并推算出20年后电池的稳定效率。更多还原

【Abstract】 In order to raise the popularization of silicon based alloy solar cells, the producing cost must be reduced and the stabilized conversion efficiency must be improved. Stability is one of the factors limiting silicon thin film solar cells’ development. But due to the degradation influence on amorphous silicon and microcrystalline solar cells, we have to make great efforts to investigate the stability problem of them and gain high stable conversion efficiency. In this paper, we have done such work:1. The degradation of silicon thin film materials with different crystal fraction was investigated. Measurements of the light absorption coefficient (a), light or dark conductivity and the ημτ product were conducted before, during and after light soaking. The mixed phase amorphous silicon was stabler than common amorphous silicon. The microcrystalline silicon near threshold is not stable as much as highly crystallized one, but its optoelectronic property is much more suitable than the others to made microcrystalline silicon solar cell.2. Microcrystalline silicon thin film solar cells with different crystal volume fraction (Xc) intrinsic layer were used to perform light soaking experiments under different light sources. The measurements of open circuit voltage (Voc), quantum efficiency (QE), J-V parameter and Raman spectroscopy were conducted before, during and after light soaking. The degradation of microcrystalline silicon solar cells was studied. It’s found that the amorphous phase exists mainly in incubative layers.3. According to the study on the stability of the top and the bottom solar cells, the condition of the stable tandem solar cells was put forward. The model of long-term performance of amorphous tandem silicon solar cells and the method to gain the parameters were investigated, then the stabilized efficiency after 20 years was calculated.更多还原