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

Wenfu Liu^1,2, Xiaolei Guo¹, Shule Xing¹

¹School of Mechanical and Energy Engineering, Huanghuai University, Zhumadian 463000, Henan, China.

Nanomaterials (Basel, Switzerland)

|September 5, 2020

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Single nanowires with graded dual shells significantly boost light absorption for optoelectronic devices. This design enhances light trapping, improving solar cell efficiency.

Area of Science:

Optoelectronics
Nanotechnology
Materials Science

Background:

Single nanowires (NWs) are crucial for nanoscale optoelectronic devices like solar cells.
Weak off-resonant absorption in NWs limits their light-harvesting efficiency.

Purpose of the Study:

To propose and analyze a graded-index dual-shell nanowire (DSNW) design for enhanced light absorption.
To investigate the impact of shell properties on light trapping and photocurrent generation.

Main Methods:

Numerical simulations were used to model light interaction with bare NWs (BNW), outer shell NWs (OSNW), inner shell NWs (ISNW), and DSNWs.
The optical properties and absorption modes were analyzed based on varying shell thickness and refractive index.

Main Results:

Keywords:

absorption dual shells off-resonance photocurrent silicon single nanowires

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The DSNW demonstrated significantly enhanced light trapping compared to BNW, OSNW, and ISNW.
Optimal shell parameters led to improved coupling between Si core resonances and nanofocused light.
Photocurrent density increased by 134% for DSNW compared to BNW.

Conclusions:

Graded dual-shell design effectively enhances off-resonant absorption in single NWs.
The DSNW offers a promising approach for developing high-efficiency single NW photovoltaic devices.