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Open AccessArticle

Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design

1
School of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, China
2
Integrated Nano Optoelectronics Laboratory, University of Michigan, Dearborn, MI 48128, USA
3
Energy Institute, University of Michigan, Ann Arbor, MI 48109, USA
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(9), 1740; https://doi.org/10.3390/nano10091740
Received: 8 August 2020 / Revised: 30 August 2020 / Accepted: 1 September 2020 / Published: 2 September 2020
(This article belongs to the Special Issue Simulation and Modeling of Nanomaterials)
Single nanowires (NWs) are of great importance for optoelectronic applications, especially solar cells serving as powering nanoscale devices. However, weak off-resonant absorption can limit its light-harvesting capability. Here, we propose a single NW coated with the graded-index dual shells (DSNW). We demonstrate that, with appropriate thickness and refractive index of the inner shell, the DSNW exhibits significantly enhanced light trapping compared with the bare NW (BNW) and the NW only coated with the outer shell (OSNW) and the inner shell (ISNW), which can be attributed to the optimal off-resonant absorption mode profiles due to the improved coupling between the reemitted light of the transition modes of the leak mode resonances of the Si core and the nanofocusing light from the dual shells with the graded refractive index. We found that the light absorption can be engineered via tuning the thickness and the refractive index of the inner shell, the photocurrent density is significantly enhanced by 134% (56%, 12%) in comparison with that of the BNW (OSNW, ISNW). This work advances our understanding of how to improve off-resonant absorption by applying graded dual-shell design and provides a new choice for designing high-efficiency single NW photovoltaic devices. View Full-Text
Keywords: single nanowires; silicon; dual shells; off-resonance; absorption; photocurrent single nanowires; silicon; dual shells; off-resonance; absorption; photocurrent
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MDPI and ACS Style

Liu, W.; Guo, X.; Xing, S.; Yao, H.; Wang, Y.; Bai, L.; Wang, Q.; Zhang, L.; Wu, D.; Zhang, Y.; Wang, X.; Yi, Y. Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design. Nanomaterials 2020, 10, 1740. https://doi.org/10.3390/nano10091740

AMA Style

Liu W, Guo X, Xing S, Yao H, Wang Y, Bai L, Wang Q, Zhang L, Wu D, Zhang Y, Wang X, Yi Y. Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design. Nanomaterials. 2020; 10(9):1740. https://doi.org/10.3390/nano10091740

Chicago/Turabian Style

Liu, Wenfu; Guo, Xiaolei; Xing, Shule; Yao, Haizi; Wang, Yinling; Bai, Liuyang; Wang, Qi; Zhang, Liang; Wu, Dachuan; Zhang, Yuxiao; Wang, Xiao; Yi, Yasha. 2020. "Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design" Nanomaterials 10, no. 9: 1740. https://doi.org/10.3390/nano10091740

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