单晶硅表面金字塔大小及分布对少子寿命的影响

Influence of Size and Fluctuation of Pyramid on Single Crystal Si Surface on Minority Carrier Lifetime

单晶硅表面钝化后少子寿命以及制成的太阳电池转换效率与单晶硅表面金字塔大小、形貌和分布密切相关。用不同的碱液刻蚀单晶硅表面,用SEM观察其表面绒面结构,测量了不同碱液刻蚀的单晶硅表面的少子寿命以及对应太阳电池的转换效率。实验研究表明,不同碱液刻蚀的单晶硅表面绒面结构形貌差异大,少子寿命明显不同。进一步研究发现,绒面上金字塔尺寸较大,且分布不均匀,则其少子寿命较短,对应太阳电池的转换效率较低;反之,绒面上金字塔小且分布均匀,则绒面少子寿命相对较长,对应的太阳电池转换效率相对较高。

The minority carrier lifetime and conversion efficiency strongly depend on the size and distribution of pyramid on the single crystal Si.The textured surface of single crystal Si etched with different alkaline solutions was observed.The minority carrier lifetime and conversion efficiency for the corresponding samples were measured.The experimental results illustrate that the surface micro-structure is different for the samples etched in different alkaline solutions.It was also observed that the large size-pyramid and large fluctuation in pyramid size could reduce the minority carrier lifetime,which leads to the low conversion efficiency of solar cell.In contrary,for the solar cell with the surface full of small size and small fluctuation in pyramid size,the minority carrier lifetime and the conversion efficiency is comparatively high.