Abstract The rhombohedral phase of silicon is fabricated over a large-area within the diamond cubic Si wafer using spherical nanoindentation. The ultraviolet and visible spectrum showed a ~50% lower reflectance for the rhombohedral Si compared to the pristine Si. The estimated refractive index of ~6.7 at 630 nm for the rhombohedral Si is ~35% higher than the diamond cubic Si, which agrees well with the theoretical calculations. The rhombohedral Si with enhanced light absorption ability is utilized as a solar absorber layer for the bare p-n junction Si solar cell and observed to show ~10 times improvement in the photocurrent density.

中文翻译：

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用于太阳能应用的压痕辅助相工程硅

摘要 使用球形纳米压痕技术在金刚石立方硅晶片内大面积制备硅的菱形相。与原始 Si 相比，紫外和可见光谱显示菱面体 Si 的反射率低约 50%。菱形硅在 630 nm 处的估计折射率约为 6.7，比金刚石立方硅高约 35%，这与理论计算非常吻合。具有增强光吸收能力的菱形硅用作裸 pn 结硅太阳能电池的太阳能吸收层，并观察到光电流密度提高了约 10 倍。