On the interplay between microstructure and interfaces in high-efficiency microcrystalline silicon solar cells

S. Hanni, D. Alexander, L. Ding, G. Bugnon, M. Boccard, C. Battaglia, P. Cuony, J. Escarré, G. Parascandolo, S. Nicolay, M. Cantoni, M. Despeisse, F. Meillaud, C. Ballif
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引用次数: 1

Abstract

This paper gives new insights into the role of both the microstructure and the interfaces in microcrystalline silicon (μc-Si) single-junction solar cells. A 3-D tomographic reconstruction of a μc-Si solar cell reveals the 2-D nature of the porous zones, which can be present within the absorber layer. Tomography thus appears as a valuable technique to provide insights into the μc-Si microstructure. Variable illumination measurements enable to study the negative impact of such porous zones on solar cells performance. The influence of such defectivematerial can bemitigated by suitable cell design, as discussed here. Finally, a hydrogen plasma cell post-deposition treatment is demonstrated to improve solar cells performance, especially on rough superstrates, enabling us to reach an outstanding 10.9% efficiency microcrystalline single-junction solar cell.
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高效微晶硅太阳电池微结构与界面的相互作用
本文对微晶硅(μc-Si)单结太阳能电池中微观结构和界面的作用有了新的认识。对μc-Si太阳电池进行三维层析重建,揭示了吸收层内多孔区的二维性质。因此,层析成像是一种有价值的技术,可以提供对μc-Si微观结构的见解。可变照明测量能够研究这些多孔区域对太阳能电池性能的负面影响。如本文所讨论的,这种有缺陷的材料的影响可以通过适当的电池设计来减轻。最后,我们证明了氢等离子电池沉积后处理可以提高太阳能电池的性能,特别是在粗糙的上覆层上,使我们能够达到10.9%的效率的微晶单结太阳能电池。
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