科研之友
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摘要
Single semiconductor nanowires offer an attractive option for low-cost and high-efficiency with diverse applications in sensing, photodetecting, and light-harvesting. One of the crucial goals for the singlenanowire-based devices is to find the most effective strategies to realize broadband and high optical absorption. We demonstrate in this study that integrating a nanovoid resonator into the single nanowire can substantially enhance the absorption to sunlight by exciting highly strengthened optical resonances in the nanovoid-deformed nanowire cavity. Without considering the factor of the reduced photoactive material, the photocurrent density of the single-nanowire solar absorber under the asymmetrical nanovoid design can be improved by 37.5% over that based on the conventional solid nanowire devices. Moreover, the high absorption can be well preserved by either filling the nanovoid with low-index dielectric or introducing the dielectric substrate. This study advances our understanding on how the sunlight can be effectively manipulated by a nanovoid in high-index semiconductor nanostructures and provides an inspiring strategy to realize highly efficient photovoltaic devices.
- 出版日期2016-9
- 单位苏州大学
