Formation of Compositionally Abrupt Axial Heterojunctions in Silicon-Germanium Nanowires

Science ◽  
2009 ◽  
Vol 326 (5957) ◽  
pp. 1247-1250 ◽  
Author(s):  
C.-Y. Wen ◽  
M. C. Reuter ◽  
J. Bruley ◽  
J. Tersoff ◽  
S. Kodambaka ◽  
...  
Keyword(s):  
Silicon Germanium ◽  
Functional Group ◽  
Gold Alloy ◽  
Group Iv ◽  
Germanium Nanowires ◽  
Solid Catalysts ◽  
Liquid Semiconductor ◽  
Extended Range ◽  
Low Solubility ◽  
Alloy Catalyst

We have formed compositionally abrupt interfaces in silicon-germanium (Si-Ge) and Si-SiGe heterostructure nanowires by using solid aluminum-gold alloy catalyst particles rather than the conventional liquid semiconductor–metal eutectic droplets. We demonstrated single interfaces that are defect-free and close to atomically abrupt, as well as quantum dots (i.e., Ge layers tens of atomic planes thick) embedded within Si wires. Real-time imaging of growth kinetics reveals that a low solubility of Si and Ge in the solid particle accounts for the interfacial abruptness. Solid catalysts that can form functional group IV nanowire-based structures may yield an extended range of electronic applications.

Tailoring thermal conductivity of silicon/germanium nanowires utilizing core-shell architecture

2016 ◽  
Vol 119 (15) ◽  
pp. 155101 ◽  
Author(s):  
S. Sarikurt ◽  
A. Ozden ◽  
A. Kandemir ◽  
C. Sevik ◽  
A. Kinaci ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Silicon Germanium ◽  
Core Shell ◽  
Germanium Nanowires

Composition and Size Effects on the Optical Properties of Isolated Silicon-Germanium Nanowires

2012 ◽  
Vol 1408 ◽  
Author(s):  
Houssem Kallel ◽  
Abdallah Chehaidar ◽  
Arnaud Arbouet ◽  
Thierry Baron ◽  
Alexis Potié ◽  
...  
Keyword(s):  
Optical Properties ◽  
Silicon Germanium ◽  
Size Effects ◽  
Numerical Study ◽  
Mie Theory ◽  
Light Polarization ◽  
Angle Of Incidence ◽  
Nanowire Diameter ◽  
Germanium Nanowires ◽  
Silicon And Germanium

ABSTRACTSilicon and Germanium nanowires (NWs) have shown a strong ability to enhance both the absorption and scattering of light. Tailoring the optical properties of Si or Ge NWs can be obtained by adjusting the nanowire diameter. Another parameter that can be used is the chemical composition of silicon-germanium (Si1-xGex-NWs) alloys. In this work, we perform a numerical study on the optical properties of single Si1-xGex-NWs based on the Lorenz-Mie theory. The effects of Ge composition, light polarization and angle of incidence on the nanowire optical properties are investigated.

ADDITION COMPOUNDS OF THE GROUP IV HALIDES: I. TRIETHYLAMINE AND THE TETRACHLORIDES OF SILICON, GERMANIUM, TIN, AND TITANIUM

1952 ◽  
Vol 30 (11) ◽  
pp. 835-841 ◽  
Author(s):  
W. R. Trost
Keyword(s):  
Thermal Decomposition ◽  
Silicon Germanium ◽  
Group Iv ◽  
Germanium Tin

Compounds with the composition of tetraminates were prepared from the tetrachlorides of silicon, germanium, tin, and titanium with triethylamine. Thermal decomposition of the tetraminates leads to the suggestion that they are molecular addition compounds.

ADDITION COMPOUNDS OF THE GROUP IV HALIDES: II. ETHYLAMINE AND THE TETRACHLORIDES OF SILICON, GERMANIUM, TIN, AND TITANIUM

1952 ◽  
Vol 30 (11) ◽  
pp. 842-843 ◽  
Author(s):  
W. R. Trost
Keyword(s):  
Transition State ◽  
Silicon Germanium ◽  
Substitution Reaction ◽  
Titanium Tetrachloride ◽  
Group Iv ◽  
Silicon Tetrachloride ◽  
Addition Compound ◽  
Germanium Tin ◽  
Tin Tetrachloride

Aminates of tin tetrachloride and titanium tetrachloride are reported. On the bases of these compounds, and the recovery of a tetraminate, SiCl4•4EtNH2, from among the substitution products in the reaction of silicon tetrachloride with ethylamine at −78 °C., it is suggested that the transition state in the substitution reaction corresponds to an addition compound.

Importance of the Pd and Surrounding Sites in Hydrosilylation of Internal Alkynes by Palladium–Gold Alloy Catalyst

2020 ◽  
Vol 39 (4) ◽  
pp. 528-537
Author(s):  
Tumpa Sadhukhan ◽  
Anchalee Junkaew ◽  
Pei Zhao ◽  
Hiroki Miura ◽  
Tetsuya Shishido ◽  
...  
Keyword(s):  
Gold Alloy ◽  
Internal Alkynes ◽  
Alloy Catalyst

(Invited) Axial Silicon-Germanium Nanowires: Properties and Device Applications

2020 ◽  
Vol 98 (2) ◽  
pp. 13-28
Author(s):  
Leonid Tsybeskov ◽  
Theodore I Kamins ◽  
Xiaohua Wu ◽  
David J. Lockwood
Keyword(s):  
Silicon Germanium ◽  
Germanium Nanowires ◽  
Device Applications

Electron excitation of the Group IV elements

2002 ◽  
Vol 80 (6) ◽  
pp. 687-696 ◽  
Author(s):  
R Srivastava ◽  
R P McEachran ◽  
A D Stauffer
Keyword(s):  
Cross Sections ◽  
Ground State ◽  
Silicon Germanium ◽  
Electron Excitation ◽  
Group Iv ◽  
Coupling Scheme ◽  
Distorted Wave ◽  
J Coupling ◽  
Group Iv Elements ◽  
Distorted Wave Method

We investigated the electron excitation of the fine-structure levels of the 3P ground state and the first excited 1D state of the first four elements of Group IV: carbon, silicon, germanium, and tin. These calculations were carried out in the j–j coupling scheme using the relativistic distorted-wave method. Results are presented for the differential cross sections and spin-polarization parameters for incident electron energies of 25 and 40 eV. PACS Nos.: 34.80Dp, 34.80Nz

Catalytic Hydrogenation of Acetone to Isopropanol on Bimetallic Silver-Gold Nanocatalyst

2019 ◽  
Vol 813 ◽  
pp. 98-103
Author(s):  
Maria Sarno ◽  
Mariagrazia Iuliano ◽  
Eleonora Ponticorvo
Keyword(s):  
Citric Acid ◽  
Liquid Phase ◽  
Synergistic Effect ◽  
Ligand Exchange ◽  
Gold Alloy ◽  
Alloy Nanoparticles ◽  
Experimental Conditions ◽  
Reaction Solution ◽  
Inorganic Precursors ◽  
Alloy Catalyst

Silver-gold alloy catalyst for ketones hydrogenation in liquid-phase using NaBH4 as hydrogen source is reported. AgAu alloy nanoparticles are synthesized from common inorganic precursors and mild experimental conditions. To favour the dispersion of the sample in the mixed-aqueous reaction solution a ligand exchange with citric acid was promoted. This citric acid modified AgAu catalyst, thanks to the synergistic effect of Au and Ag, allows for the selective hydrogenation of ketones with to maximum isopropanol yields of 99.7 % within 8 min and shows an excellent reusability after 7 run.

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