Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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

Wenfu Liu
* ORCID logo ,
Xiaolei Guo
,
Shule Xing
,
Haizi Yao
,
Yinling Wang
,
Liuyang Bai
,
Qi Wang
,
Liang Zhang
,
Dachuan Wu
,
Yuxiao Zhang
,
Xiao Wang
,
Yasha Yi
*
Version 1 : Received: 8 August 2020 / Approved: 11 August 2020 / Online: 11 August 2020 (07:53:08 CEST)
Version 2 : Received: 30 August 2020 / Approved: 31 August 2020 / Online: 31 August 2020 (08:30:22 CEST)

A peer-reviewed article of this Preprint also exists.

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. 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.

Abstract

Single nanowires (NWs) are of great importance for various 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 the proper 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 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 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 adjusted via tuning the thickness and 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 shells and provides a new choice for designing high-efficiency single NW photovoltaic devices.

Keywords

single nanowires; silicon; dual shells; off-resonance; absorption; photocurrent

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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