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在晶体硅表面沉积本征非晶硅层的异质结(SHJ)太阳电池以其高效率、高稳定性、低成本和低温制备等诸多优势被人们广泛关注.在晶体硅衬底表面制绒,是提高太阳电池效率的有效途径之一.本文采用四甲基氢氧化铵(TMAH)在硅片表面制备了不同形貌的金字塔结构的硅异质结电池衬底,并应用到电池中.通过研究不同金字塔的形貌,光学特性以及电学特性,找出提高硅片钝化效果,改善异质结电池的性能的优化的金字塔结构.结果表明:2%(w)TMAH,10%(w)异丙醇(IPA)可以在硅片表面制得标准四面体金字塔结构.和其它两种金字塔结构相比较,标准四面体金字塔结构绒面衬底反射率最低,可以提高太阳电池的短路电流密度(Jsc).同时,这种结构金字塔形貌可以提高钝化效果,改善电池各项性能参数.
Heterojunction (SHJ) solar cells that deposit intrinsic amorphous silicon layers on crystalline silicon surfaces have attracted much attention due to their high efficiency, high stability, low cost, and low temperature preparation. Is one of the effective ways to improve the efficiency of solar cells.In this paper, pyramidal silicon heterojunction cell substrates with different morphologies were prepared on the surface of silicon wafer by using tetramethylammonium hydroxide (TMAH) and applied to the cell. The optimized pyramidal structure was obtained by studying the morphologies, optical properties and electrical properties of different pyramids, and the results showed that the optimal pyramidal structure of 2% (w) TMAH, 10% (w ) Isopropanol (IPA) produces a standard tetrahedral pyramid structure on the surface of the wafers.Compared with the other two pyramid structures, the standard tetrahedral pyramid structure has the lowest reflectance of the suede substrate, which can improve the short-circuit current density (Jsc) .At the same time, this pyramidal structure can improve the passivation effect and improve the battery performance parameters.