期刊
NANO LETTERS
卷 15, 期 1, 页码 753-758出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl504462e
关键词
Solar energy; photovoltaic device; silicon nanowires; optical antenna; FDTD simulation
类别
资金
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2013R1A1A1059423]
- National Research Foundation of Korea (NRF) grant - Korean government (MSIP) [2009-0081565]
- UNC-Chapel Hill
- Direct For Mathematical & Physical Scien [1308695] Funding Source: National Science Foundation
Semiconductor nanowires (NWs) often exhibit efficient, broadband light absorption despite their relatively small size. This characteristic originates from the subwavelength dimensions and high refractive indices of the NWs, which cause a light-trapping optical antenna effect. As a result, NWs could enable high-efficiency but low-cost solar cells using small volumes of expensive semiconductor material. Nevertheless, the extent to which the antenna effect can be leveraged in devices will largely determine the economic viability of NW-based solar cells. Here, we demonstrate a simple, low-cost, and scalable route to dramatically enhance the optical antenna effect in NW photovoltaic devices by coating the wires with conformal dielectric shells. Scattering and absorption measurements on Si NWs coated with shells of SiNx or SiOx exhibit a broadband enhancement of light absorption by similar to 50-200% and light scattering by similar to 200-1000%. The increased light-matter interaction leads to a similar to 80% increase in short-circuit current density in Si photovoltaic devices under 1 sun illumination. Optical simulations reproduce the experimental results and indicate the dielectric-shell effect to be a general phenomenon for groups IV, II-VI, and III-V semiconductor NWs in both lateral and vertical orientations, providing a simple route to approximately double the efficiency of NW-based solar cells.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据