Growth of amorphous silicon nanowires

... on a large area 10= 10 mm of 111 Si substrate after a 1 h period of growth. EDS analysis Ž. inset proved that the nanowires consist mainly of silicon. A trace amount of oxygen exists in the a-SiNWs, ... consists of nanoparticles of a few Fig. 2. Schematic depiction of SiNW growth by the SLS mecha- Ž. Ž . nism: a deposition of a thin layer of Ni on the Si 111 substrate;...

Ngày tải lên: 16/03/2014, 15:05

... grown silicon nanowires are of an amorphous state and some of nanowires appear to bifurcate in the vertically growth process. The eect of H 2 gas etchings on the catalytic size and the eect of ... of the nanowires is 30 nm. The alignment of the nanowires is improved. Compared with our previously work [17], we got amorphous aligned silicon nanowires instead o...

Ngày tải lên: 16/03/2014, 15:05

... formation of a titanium oxide (TiO x ) phase by removal of oxygen from the silica layer [9]. The re- duction of TiN seems to be a critical factor in the growth kinetics of a-SiONWs. The growth of silica ... suppresses the decomposition of TiN, as a result, it limits the growth of a-SiONWs nanowires by the mechanism. Oxygen seems Fig. 4. (a) A TEM photograph of a cross...

Ngày tải lên: 16/03/2014, 15:04

... in the growth of SiNWs. Because this growth process involves solid–liquid–solid phases, it is named as a SLS growth, which is in fact an analogy of the VLS mechanism. The growth process of the ... a large area (10 mm × 10 mm) of 111 Si substrate. The nanowires grew directly on the substrate. It is visible that the deposit consists of pure SiNWs. The growth rate of the...

Ngày tải lên: 16/03/2014, 15:14

... Yang a, * a State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China b Graduate School of the Chinese Academy of Sciences, Beijing, ... and the high dispersion of Au nanoparticles on the surface of the SiNWs without any aggregation. The formation of the SiNWs was explained on the basis of the reactio...

Ngày tải lên: 16/03/2014, 15:06

... agglomerated clusters consisting of high density of nanowires. The magnified view of a single cluster is depicted in the inset of Fig. 2(d). These observations suggest that growth of nanowires in the present ... source for silicon nanowires growth. Fig. 3(a) shows a typical TEM micrograph of nanowires deposited on Ni-coated Si wafers. The nanowires have diameter in t...

Ngày tải lên: 16/03/2014, 15:18

... at% of O, 41.87 at% of Si, 8.66 at% of V, 0.74 at% of Zn, and no Cl, for the catalyst tip in Fig. 2(b), and 60.28 at% of O, 39.40 at% of Si, 0.32 at% of V, and no Zn or Cl, for the long nanowires ... that the growth process of amorphous silica nanowires is catalyst-assisted. EDX was applied to examine the chemical composition of the as-grown nanowires. Fig. 3(a) sho...

Ngày tải lên: 16/03/2014, 15:19

... since little droplets can be seen at the tops of the nanowires [17]. The growth of the nanowires Fig. 2. XPS of the sample. (a) survey spectrum of the sample; (b) Si2p binding energy spectrum; ... was observed in oxidized porous silicon and annealed SiO 2 [15]. The PL spectrum is also dierent from that of oxidized Si nanowires [16]. The growth process of the nanowire...

Ngày tải lên: 16/03/2014, 15:07

... that the Si L 23 ELNES of amorphous silicon monoxide appears to be a superposition of the spectra of elemental silicon and of SiO 2 [14]. The onset of the ne ar-edge structure of the nano- wire is ... nanowire growth. In this Letter, we demonstrate the growth of Pt-catalyzed SiO x nanowires by a simple procedure, i.e., rapid thermal annealing. The effect of growth...

Ngày tải lên: 16/03/2014, 15:09

... degrade the performance of Si nanowire devices even if it diffuses into the nanowires. Some studies have reported on the growth of Si nanowires using Pt with a precursor of SiH 4 or SiCl 4 [4–6]. ... 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 map...

Ngày tải lên: 16/03/2014, 15:05