柔性衬底非晶硅/微晶硅叠层太阳电池

Investigation of Amorphous Silicon/Microcrystalline Silicon Tandem Solar Cells on Flexible Substrates

报道了对柔性衬底非晶硅/微晶硅叠层太阳电池的研究结果。首先采用等离子体化学气相沉积(PECVD)方法在不锈钢柔性衬底上制备了微晶硅太阳电池,发现合适的硅烷浓度和引入Ag/ZnO背反射镜可提高微晶硅太阳电池的性能,使之作为叠层太阳电池的底电池。然后将不同厚度的硅基p+/n+隧穿结应用于非晶硅/微晶硅叠层太阳电池,分析了其对太阳电池电学和光学特性的影响,发现p+层厚度增加后,电池的开路电压提高,短路电流密度减小;随着n+层厚度的变化,电池的短路电流密度和填充因子均存在最佳值。获得了光电转换效率为11.26%(AM1.5,1000W/m2)的不锈钢柔性衬底非晶硅/微晶硅叠层太阳电池。并进行了大面积化工作,在不锈钢衬底和聚酰亚胺衬底上分别获得了光电转换效率为5.89%(25cm2,AM0,1353W/m2)和5.82%(4cm2,AM0,1353W/m2)的叠层太阳电池。

An investigation of amorphous silicon/microcrystalline silicon tandem solar cells on flexible substrates is presented in this paper.Microcrystalline silicon solar cells were prepared by the Plasma Enhanced Chemical Vapor Deposition（PECVD） on stainless steel flexible substrates.The performance of solar cells saw an effective improvement by employing appropriate silane concentrations and Ag/ZnO back reflectors.The influence of p＋/n＋ tunnel junctions on electrical and optical properties of amorphous silicon/microcrystalline silicon tandem solar cells was investigated.It is found that the open circuit voltage increases and the short circuit current decreases when the thickness of p＋ layer increases,and the short circuit current and the FF would assume optimal values for an appropriate thickness of n＋ layer.Amorphous silicon/microcrystalline silicon tandem solar cells on stainless steel flexible substrates with conversion efficiency of 11.26%（AM1.5,1000W/m2） were obtained.With the scale-up of the devices,tandem solar cells on stainless steel flexible substrates with conversion efficiency of 5.89%（25cm2,AM0,1353W/m2） and on polyimide with conversion efficiency of 5.82%（4cm2,AM0,1353W/m2） were obtained.