Graduate Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, Taipei, Taiwan, ROC.
Nanoscale. 2012 Oct 21;4(20):6520-6. doi: 10.1039/c2nr32358c.
We employ a ZnO nanorod/Si(3)N(4)-coated Si microgroove-based hierarchical structure (HS) for a light-harvesting scheme in 5 inch single crystalline Si solar cells. ZnO nanorods and Si microgrooves were fabricated by a simple and scalable aqueous process. The excellent light-harvesting characteristics of the HS, such as broadband working ranges and omnidirectionality have been demonstrated using external quantum efficiencies and reflectance measurements. The solar cells with the hierarchical surface exhibit excellent photovoltaic characteristics, i.e., a short-circuit current (J(SC)) of 38.45 mA cm(-2), open-circuit voltage of 609 mV and conversion efficiency of 14.04%. As incident angles increase from 0° to 60°, only 5.3% J(SC) loss is achieved by employing the hierarchical surface, demonstrating the enhanced omnidirectional photovoltaic performances, also confirmed by the theoretical analysis. A viable scheme for broadband and omnidirectional light harvesting using the HS employing microscale/nanoscale surface textures on single crystalline Si solar cells has been demonstrated.
我们采用 ZnO 纳米棒/Si(3)N(4)涂层硅微槽的分层结构（HS），在 5 英寸单晶硅太阳能电池中实现光捕获方案。通过简单且可扩展的水相工艺制备了 ZnO 纳米棒和硅微槽。使用外量子效率和反射率测量，证明了 HS 的宽带工作范围和各向同性等优异的光捕获特性。具有分层表面的太阳能电池表现出优异的光伏特性，即短路电流（J(SC)）为 38.45 mA cm(-2)，开路电压为 609 mV，转换效率为 14.04%。当入射角从 0°增加到 60°时，通过采用分层表面仅损失 5.3%的 J(SC)，证明了增强的各向同性光伏性能，这也通过理论分析得到了证实。已经证明了在单晶硅太阳能电池上使用微尺度/纳米尺度表面结构的 HS 进行宽带和各向同性光捕获的可行方案。
