Effects of silver and gold catalytic activities on the structural and optical properties of silicon nanowires |
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| Institution: | 1. Physics Department, University of Shahrood, Shahrood, Iran;2. Iranian National Center for Laser Science and Technology, Tehran, Iran;1. Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;2. Department of Information Electronics, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811-0295, Japan;3. Department of Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan;4. Research Center for Quantum Nano-Spin Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan;1. Physics Department, Faculty of Education, Ain Shams University, Roxy, P.O. 11757, Cairo, Egypt;2. Physics Department, Faculty of Science, Ain Shams University, Abbassia, P.O. 11566, Cairo, Egypt;3. Solid State Physics Department, National Research Centre, 33 El Bohouth St. (former El Tahrir st.), Dokki, P.O.12622, Giza, Egypt;1. Institute of Theoretical Physics and Astronomy, Vilnius University, A. Gostauto 12, LT-01108 Vilnius, Lithuania;2. Research Institute for Applied Physics, University of Tabriz, Tabriz, Iran;1. Kobe Advanced ICT Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka, Kobe, Hyogo 651-2492, Japan;2. Department of Physics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan;3. Surface Physics and Structure Unit, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan |
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| Abstract: | The metal-assisted chemical etching of silicon in an aqueous solution of hydrofluoric acid and hydrogen peroxide is established for the fabrication of large area, uniform silicon nanowire (SiNW) arrays. In this study, silver (Ag) and gold (Au) are considered as catalysts and the effect of different catalysts with various thicknesses on the structural and optical properties of the fabricated SiNWs is investigated. The morphology of deposited catalysts on the silicon wafer is characterized by atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM). It is shown that the morphology of the fabricated silicon nanostructures remarkably depends upon the catalyst layer thickness, and the catalyst etching time directly affects the structural and optical properties of the synthesized SiNWs. FESEM images show a linear increment of the nanowire length versus time, whereas the etching rate for the Au-etched SiNWs was lower than the Ag-etched ones. Strong light scattering in SiNWs caused the total reflection to decrease in the range of visible light, and this decrement was higher for the Ag-etched SiNW sample, with a longer length than the Au-etched one. A broadband visible photoluminescence (PL) with different peak positions is observed for the Au- and Ag-etched samples. The synthesized optically active SiNWs can be considered as a promising candidate for a new generation of nano-scale opto-electronic devices. |
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| Keywords: | Silicon nanowires Metal-assisted etching Silver and gold catalysts Optical properties |
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