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Periodically Diameter-Modulated Semiconductor Nanowires for Enhanced Optical Absorption

Title
Periodically Diameter-Modulated Semiconductor Nanowires for Enhanced Optical Absorption
Author(s)
Ko, MinjeeBaek, Seong-HoSong, BokyungKang, Jang-WonKim, Shin-AeCho, Chang-Hee
DGIST Authors
Baek, Seong-HoKang, Jang-WonCho, Chang-Hee
Issued Date
2016-04
Type
Article
Article Type
Article
Keywords
3D Finite Difference Time DomainsARRAYSCylindrical NanowiresDESIGNDEVICESDiameter ModulationDiameter ModulationElectromagnetic Wave AbsorptionFinite Difference Time Domain MethodLeaky Waveguide ModesLeaky WaveguidesLight AbsorptionLIGHT MANAGemENTMODESModulationNANOPILLARSNanowiresOptical AbsorptionOptical PropertiesPropagation DistancesRESONANCESSemiconducting NanowiresSemiconductor NanowireSiliconSilicon NanowiresSilicon NanowiresSilicon NanowiresSOLAR-CELLS
ISSN
0935-9648
Abstract
A novel approach to enhancing optical absorption was reported by modulating the diameters of semiconducting nanowires, in which the diameter changes periodically in a sinusoidal manner along the long axis of the wire. 3D finite-difference time-domain (FDTD) simulations were used to calculate the optical properties of the diameter-modulated nanowires and compared the results with those for simple cylindrical nanowires and planar bulk silicon. The diameter-modulated silicon nanowires were modeled using a sinusoidal radial function with a period of 565 nm and modulated diameters of 495 and 380 nm at the convex and concave points, respectively, whereas the simple cylindrical silicon nanowire had a diameter of 410 nm. The optical absorption was calculated by measuring the power absorbed by the same volume of silicon over a propagation distance of 283 nm from the top surface, corresponding to the half-period of the diameter modulation. The results show that the optical absorption efficiency is highly enhanced with decreasing the mean diameter, and also increased with decreasing the modulation period, where the diameter difference is 115 nm from convex to concave points. On the other hand, the absorption effi ciency is not sensitive to the nanowire length of a few μm scale due to short propagation lengths less than 2 μm.
URI
http://hdl.handle.net/20.500.11750/2696
DOI
10.1002/adma.201505144
Publisher
Wiley-VCH Verlag
Related Researcher
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Appears in Collections:
Department of Physics and Chemistry ETC 1. Journal Articles
Department of Physics and Chemistry Future Semiconductor Nanophotonics Laboratory 1. Journal Articles
Smart Textile Convergence Research Group 1. Journal Articles

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