Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design
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)....
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| Format: | Article |
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MDPI AG
2020-09-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/10/9/1740 |
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| author | Wenfu Liu Xiaolei Guo Shule Xing Haizi Yao Yinling Wang Liuyang Bai Qi Wang Liang Zhang Dachuan Wu Yuxiao Zhang Xiao Wang Yasha Yi |
| author_facet | Wenfu Liu Xiaolei Guo Shule Xing Haizi Yao Yinling Wang Liuyang Bai Qi Wang Liang Zhang Dachuan Wu Yuxiao Zhang Xiao Wang Yasha Yi |
| author_sort | Wenfu Liu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-10T16:37:18Z |
| format | Article |
| id | doaj.art-e816e108e73943e5a36aa54b255247f6 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T16:37:18Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-e816e108e73943e5a36aa54b255247f62023-11-20T12:22:23ZengMDPI AGNanomaterials2079-49912020-09-01109174010.3390/nano10091740Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell DesignWenfu Liu0Xiaolei Guo1Shule Xing2Haizi Yao3Yinling Wang4Liuyang Bai5Qi Wang6Liang Zhang7Dachuan Wu8Yuxiao Zhang9Xiao Wang10Yasha Yi11School of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaSchool of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, ChinaIntegrated Nano Optoelectronics Laboratory, University of Michigan, Dearborn, MI 48128, USAIntegrated Nano Optoelectronics Laboratory, University of Michigan, Dearborn, MI 48128, USAIntegrated Nano Optoelectronics Laboratory, University of Michigan, Dearborn, MI 48128, USAIntegrated Nano Optoelectronics Laboratory, University of Michigan, Dearborn, MI 48128, USASingle 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.https://www.mdpi.com/2079-4991/10/9/1740single nanowiressilicondual shellsoff-resonanceabsorptionphotocurrent |
| spellingShingle | Wenfu Liu Xiaolei Guo Shule Xing Haizi Yao Yinling Wang Liuyang Bai Qi Wang Liang Zhang Dachuan Wu Yuxiao Zhang Xiao Wang Yasha Yi Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design Nanomaterials single nanowires silicon dual shells off-resonance absorption photocurrent |
| title | Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design |
| title_full | Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design |
| title_fullStr | Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design |
| title_full_unstemmed | Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design |
| title_short | Off-Resonant Absorption Enhancement in Single Nanowires via Graded Dual-Shell Design |
| title_sort | off resonant absorption enhancement in single nanowires via graded dual shell design |
| topic | single nanowires silicon dual shells off-resonance absorption photocurrent |
| url | https://www.mdpi.com/2079-4991/10/9/1740 |
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