Zhang Jinnan, Ai Lingmei, Yan Xin, Wu Yao, Wei Wei, Zhang Mingqian, Zhang Xia
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou, 510006, China.
Nanoscale Res Lett. 2018 Oct 3;13(1):306. doi: 10.1186/s11671-018-2727-7.
The photovoltaic performance of axial and radial pin junction GaAs nanocone array solar cells is investigated. Compared with the cylinder nanowire arrays, the nanocone arrays not only improve the whole optical absorption but more importantly enhance the effective absorption (absorption in the depletion region). The enhanced effective absorption is attributed to the downward shift and extension of the absorption region induced by the shrinking top, which dramatically suppresses the absorption loss in the high-doped top region and enhances the absorption in the depletion region. The highest conversion efficiencies for axial and radial GaAs nanocone solar cells are 20.1% and 17.4%, obtained at a slope angle of 5° and 6°, respectively, both of which are much higher than their cylinder nanowire counterparts. The nanocone structures are promising candidates for high-efficiency solar cells.
研究了轴向和径向pin结GaAs纳米锥阵列太阳能电池的光伏性能。与圆柱纳米线阵列相比，纳米锥阵列不仅提高了整体光吸收，更重要的是增强了有效吸收（耗尽区内的吸收）。有效吸收增强归因于顶部收缩引起的吸收区域向下移动和扩展，这显著抑制了高掺杂顶部区域的吸收损失，并增强了耗尽区域的吸收。轴向和径向GaAs纳米锥太阳能电池的最高转换效率分别在5°和6°的倾斜角下获得，为20.1%和17.4%，两者均远高于其对应的圆柱纳米线电池。纳米锥结构是高效太阳能电池的有前景的候选者。
