Optical spectroscopy of silicon nanowires

... Optical spectroscopy of silicon nanowires Jifa Qia,*, John M. Whitea, Angela M. Belchera, Yasuaki MasumotobaDepartment of Chemistry and Biochemistry, University of Texas, ... shows the Raman scattering spectra of theSiNWs and crystal silicon. A very sharp andFig. 1. A typical SEM image of the morphology of aligned silicon nanowires of uniform diameter distribution ... linewidth of crystalline silicon, and D is the size of crystal. Eq. (1) was used to ﬁtthe Raman spectra. The continuous line in Fig. 3shows the best-ﬁt result, and the average crystalsize of nanowires...

First principles optical properties of silicon and germanium nanowires

... models.4. Optical properties of SiNWs and GeNWsIn Section 5 of the present paper, we aim to point outthe importance of the many-body eﬀects on the optica l re-sponse of some of the studied nanowires. ... axis of the wire. Further the possibility to modifytheir optical response as a function of their size has becomeone of the most challenging aspect of recent semiconductorresearch. Because of ... onset of optical absorption is foundonly in the case of GeNWs and not in the case of SiNWs.With the inclusion of the excitonic eﬀects (bottom panels)we see that an important transfer of the...

Carbon assisted synthesis of silicon nanowires

... char-acteristic of cubic silicon with a small impurity of silica.Reaction of silicon powder with activated car-bon in the absence of H2, by procedure (ii), yieldedabundant quantities of SiNWs. ... to the (1 1 1) planes of silicon. The crystallinity of the nanowires is con-siderably higher when only argon was used instead of a mixture of argon and hydrogen. The role of hydrogen in promoting ... 2003AbstractCarbon-assisted synthesis of silicon nanowires has been accomplished with silicon powders as well as solid sub-strates. The method involves heating an intimate mixture of silicon powder and activated...

Growth kinetics of silicon nanowires by platinum assisted vapour–liquid–solid mechanism

... HRTEM image of Si nanowire using Au. (d) HRTEM image of Si nanowire using Pt. Both were single crystal. (e) EDS line mapping of Si nanowires using Au catalyst. (f) EDS line mapping of Si nanowires ... show that the Si nanowires are sin-gle crystalline, without any structural defects. Alloy globules of Pt–Si or Au–Si were formed at the tips of the nanowires. An energydispersive spectroscopy (EDS) ... degrade the performance of Sinanowire devices even if it diffuses into the nanowires. Somestudies have reported on the growth of Si nanowires using Ptwith a precursor of SiH4or SiCl4[4–6]....

Temperature dependence of morphology and diameter of silicon nanowires synthesized by laser ablation

... oxideexceeded the growth rate of crystal silicon, outerlayer of silicon oxide will surround the crystal sil-icon. As a result, the growth of crystal silicon ceased and silicon oxide of outer layer coalescedtogether ... Thepeculiar feature of the branch suggests that theremay exist a competitive growth between crystal silicon core and outer layer of silicon oxide. Whenthe forming rate of outer layer of silicon oxideexceeded ... when thediameter of tip was large enough. Moreover, abifurcation phenomenon of the silicon nanowires was also observed, which may be attributed torenucleation of the crystal silicon in growth...

Temperature dependence of the quality of silicon nanowires produced over a titania supported gold catalyt

... °C. Silicon nanowires produced at this temperature have a well-crystal-lized silicon core with a very thin amorphous sili-con dioxide outer layer. The length of the nanowires is in the range of ... andquality of the products obtained as a function of temperature.Ó 2003 Elsevier B.V. All rights reserved.1. Introduction Silicon nanowires (SiNWs) have been widelystudied because of their unique ... reserved.doi:10.1016/S0009-2614(03)01187-4and silicon tetrachloride (SiCl4). Westwater et al.[7,8] have reported that the use of silane as Sisource to prepare silicon nanowires via CVD yieldsmuch thinner nanowires than...

A study in the growth mechanism of silicon nanowires with or without metal catalyst

... thecatalytic growth. However, the growth of silicon nanowires with sulfide is chiefly affected by the compound decomposition, gas stream, andtemperature difference. Silicon nanowires fabricated with metal ... typical sample of synthesis of SiNWs without a metal catalyst [17]. In this case,the SiOxvapor decomposes into Si atoms, which act as thenuclear of SiNWs covered by shells of silicon oxide.Metal-assisted ... absorption of vapor-phase silicon atoms. The continuous absorption induces the supersat-uration of the formed liquid alloy with silicon atoms, which leads tonucleation and growth of a SiNW...

Infrared spectra of silicon nanowires

... 200030, People's Republic of ChinabState Key Lab of Silicon Materials, Zhejiang University, Hangzhou 310027, People's Republic of ChinacDepartment of Physics, Zhejiang University, ... Sample-IIIwas grown on a p-type (111) silicon wafer with a resistivity of ∼ 0.001 Ω cm at the position of higher temperature in the samesystem of Sample-II. The diameter of those SiNWs varied fromMaterials ... from the analysis of oxide layer on SiNWsgrown under different conditions. The crystalline quality of sample-IIis better than that of sample-I because of the improvement of tempera-ture. Thus,...

Synthesis and characterization of silicon nanowires using tin catalyst for solar cells application

... silicon nanowires were synthesized for solar cells application. Voluminous silicon nanowires were fabricated on single crystalline silicon wafer. Optical reﬂectance and solar cell efﬁciency of ... thesynthesized silicon nanowires were explored. The reﬂectance of as-synthesized silicon nanowires wasobtained approximately 5% in the short wavelength region (λb 500 nm). A short circuit current of 2.3 ... characterization of silicon nanowires using tin catalyst for solarcells applicationMinsung Jeon⁎, Koichi KamisakoDepartment of Electronic and Information Engineering, Tokyo University of Agriculture...

Synthesis of silicon nanowires after hydrogen radical treatment

... Synthesis of silicon nanowires after hydrogen radical treatmentMinsung Jeon⁎, Koichi KamisakoDepartment of Electronic and Information Engineering, Tokyo University of Agriculture and ... the well-known nanotubes and nanowires, have been utilized extensively in the various ﬁelds of nanoscale optical and electronic devices [2–5]. In particular, silicon nanowires (SiNWs) are irresistible ... 2007Accepted 16 May 2008Available online 24 May 20 08Keywords: Silicon nanowires Hydrogen radicalsMetal oxide ﬁlmNanoparticles Silicon nanowires (SiNWs) were synthesized through the hydrogen radical-assisted...

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