Optical properties and carrier dynamics of ensembles of InP nanowires grown on non-single-crystal platforms

2009 ◽  
Vol 1178 ◽  
Author(s):  
Takehiro Onishi ◽  
Andrew J. Lohn ◽  
Nobuhiko P. Kobayashi
Keyword(s):  
Optical Properties ◽  
Single Crystal ◽  
Quartz Substrate ◽  
Chemical Vapor ◽  
Blue Shift ◽  
Growth Direction ◽  
Longitudinal Optical ◽  
Face Centered Cubic ◽  
Single Crystal Surfaces ◽  
Face Centered

AbstractOptically active InP nanowires were grown on a quartz substrate covered with a layer (100 nm) of hydrogenated amorphous silicon (a-Si:H) by metalorganic chemical vapor deposition (MOCVD), demonstrating that single-crystal semiconductor nanowires can be formed on non-single-crystal surfaces. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, cathodoluminescence (CL), and photoluminescence (PL) were used to characterize the structural and optical properties of the nanowires. The nanowires on a-Si:H grew in random directions with high density. The XRD suggests that nanowires having either hexagonal-close-packed or face-centered cubic lattices co-exist. The Raman spectrum shows peaks associated with transverse optical (TO) and longitudinal optical (LO) branches of InP. The CL intensity does not vary signi?cantly along the growth direction and appears to be originated from the entire structure of the nanowire when probed at various positions. The CL data suggests that recombination is slow enough to allow the carriers to diffuse the complete length of the nanowires (˜2 m in length) before recombining. The PL spectrum suggested the nanowire had a part that contributes to the observed blue shift while the other part had nearly bulk feature in their structure.

scholarly journals Stability and equation of state of face-centered cubic and hexagonal close packed phases of argon under pressure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Agnès Dewaele ◽  
Angelika D. Rosa ◽  
Nicolas Guignot ◽  
Denis Andrault ◽  
João Elias F. S. Rodrigues ◽  
...  
Keyword(s):  
Equation Of State ◽  
Single Crystal ◽  
Single Crystal Sample ◽  
Moderate Pressure ◽  
Face Centered Cubic ◽  
Experimental Conditions ◽  
Crystal Sample ◽  
Hexagonal Close Packed ◽  
Face Centered ◽  
Fcc Phase

AbstractThe compression of argon is measured between 10 K and 296 K up to 20 GPa and and up to 114 GPa at 296 K in diamond anvil cells. Three samples conditioning are used: (1) single crystal sample directly compressed between the anvils, (2) powder sample directly compressed between the anvils, (3) single crystal sample compressed in a pressure medium. A partial transformation of the face-centered cubic (fcc) phase to a hexagonal close-packed (hcp) structure is observed above 4.2–13 GPa. Hcp phase forms through stacking faults in fcc-Ar and its amount depends on pressurizing conditions and starting fcc-Ar microstructure. The quasi-hydrostatic equation of state of the fcc phase is well described by a quasi-harmonic Mie–Grüneisen–Debye formalism, with the following 0 K parameters for Rydberg-Vinet equation: $$V_0$$ V 0 = 38.0 Å$$^3$$ 3 /at, $$K_0$$ K 0 = 2.65 GPa, $$K'_0$$ K 0 ′ = 7.423. Under the current experimental conditions, non-hydrostaticity affects measured P–V points mostly at moderate pressure ($$\le$$ ≤ 20 GPa).

scholarly journals The strain hardening of micro-sized face-centered-cubic single crystal metals: A crystal plasticity study

AIP Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 125208 ◽  
Author(s):  
Huili Guo ◽  
Chenlin Li ◽  
Xu Zhang ◽  
Fulin Shang
Keyword(s):  
Single Crystal ◽  
Strain Hardening ◽  
Crystal Plasticity ◽  
Face Centered Cubic ◽  
Face Centered

Magnetic and magneto‐optic properties of thick face‐centered‐cubic Co single‐crystal films

1994 ◽  
Vol 64 (20) ◽  
pp. 2736-2738 ◽  
Author(s):  
T. Suzuki ◽  
D. Weller ◽  
C.‐A. Chang ◽  
R. Savoy ◽  
T. Huang ◽  
...  
Keyword(s):  
Single Crystal ◽  
Face Centered Cubic ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Face Centered ◽  
Magneto Optic

Formation of Face Centered Cubic Titanium Thin Films on MgO(111) Single Crystal Substrate

2018 ◽  
Vol 913 ◽  
pp. 264-269
Author(s):  
Lei Li ◽  
Yan Liu ◽  
Xiao Nan Mao ◽  
Vincent Ji
Keyword(s):  
Single Crystal ◽  
Single Crystal Substrate ◽  
Temperature Phase ◽  
Face Centered Cubic ◽  
Hexagonal Close Packed ◽  
Crystal Substrate ◽  
Cubic Structure ◽  
Hcp Structure ◽  
Face Centered ◽  
Ti Films

High strength, low density, and excellent corrosion resistance are the main properties that make titanium attractive for a variety of applications. The phase structures and phase transitions of titanium, which are of tremendous scientific and technological interest, have attracted a great deal of attention for many years. In addition to hexagonal close packed α-Ti, high temperature phase β-Ti with body-centered cubic structure and ω-Ti with the hexagonal structure of high-pressure phase, the face-centered cubic structure, which is not in the P-T diagram of titanium, is observed in ultrathin films. In the present paper, the Ti films prepared by magnetron sputtering on MgO(111) single crystal substrate were investigated by means of X-Ray Diffraction (XRD) and High-Resolution Transmission Electron Microscope (HRTEM). The results showed that the Ti films grow epitaxial with a face centered cubic (fcc) structure even the thickness is up to about 50nm. With the thickness increases, the Ti films transformed to hexagonal close packed (hcp) structure and showed an epitaxial growth along (002)hcp-Ti direction. The results show that the onset thickness of fcc-hcp structure transformation is 50-100nm. The temperature and power of sputter affect the formation of fcc-Ti.

The stresses in a face-centered cubic single crystal under uniaxial tension

1993 ◽  
Vol 24 (4) ◽  
pp. 875-881 ◽  
Author(s):  
Xiaoyu Hu ◽  
Chao Wei ◽  
Harold Margolin ◽  
Said Nourbakhsh
Keyword(s):  
Single Crystal ◽  
Uniaxial Tension ◽  
Face Centered Cubic ◽  
Face Centered

scholarly journals Hydrothermal Synthesis and Optical Properties of Undoped and \(\text{Eu}^{3+}\)-doped Zinc Stannate Nanocrystals

2016 ◽  
Vol 25 (4) ◽  
pp. 327 ◽  
Author(s):  
Nguyen Duy Thien ◽  
Nguyen Ngoc Tu ◽  
Ngo Nhu Viet ◽  
Nguyen Duy Phuong ◽  
Le Van Vu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Emission Spectra ◽  
Molar Ratio ◽  
Face Centered Cubic ◽  
Excitation Spectra ◽  
Cubic Crystal ◽  
Zinc Stannate ◽  
Scattering Spectra ◽  
Hydrothermal Approach ◽  
Face Centered

Abstract. In this work we report a hydrothermal approach for synthesis of zinc stannate (Zn2SnO4)nanocrystals. Our research focused on the effect of the molar ratio of initial chemicals, reaction temperature and reaction duration on the phase composition and the fluorescence properties.Structural and optical properties of the final products were investigated in detail. X-ray diffractionanalysis indicated that the Zn2SnO4 nanocrystals possess face-centered cubic crystal structure.Raman scattering spectra exhibit two characteristic vibrational modes of Zn2SnO4 crystals. Optical band gap of Eu3+-doped Zn2SnO4 nanocrystals obviously depends on Eu3+content. Theroom-temperature emission spectra of the undoped Zn2SnO4 nanocrystals show two broad bands,while the photoluminescence spectra of Eu3+-doped Zn2SnO4 nanocrystals exhibit the emissionpeaks related to the radiative intra-configurational f-f tr ansitions of Eu3+ions. The absorptiontransitions within Eu3+ions were observed both in the photoluminescence excitation spectra andin the diffuse reflection spectra.

scholarly journals Fabrication and Characterization of ZnS/Diamond-Like Carbon Core-Shell Nanowires

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Jung Han Kim ◽  
Seul Cham Kim ◽  
Do Hyun Kim ◽  
Kyu Hwan Oh ◽  
Woong-Ki Hong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Coating Layer ◽  
Wavelength Region ◽  
Chemical Vapor ◽  
Diamond Like Carbon ◽  
Core Shell ◽  
Face Centered Cubic ◽  
Infrared Wavelength ◽  
Dlc Coating ◽  
Shell Nanowires

We fabricated ZnS/diamond-like carbon (DLC) core-shell heterostructure nanowire using a simple two-step process: the vapor-liquid-solid method combined with radio frequency plasma enhanced chemical vapor deposition (rf PECVD). As a core nanowire, ZnS nanowires with face-centered cubic structure were synthesized with a sputtered Au thin film, which exhibit a length and a diameter of ~10 μm and ~30–120 nm . After rf PECVD for DLC coating, The length and width of the dense ZnS/DLC core-shell nanowires were a range of ~10 μm  and 50–150 nm , respectively. In addition, ZnS/DLC core-shell nanowires were characterized with scanning transmission electron microscopy. From the results, the products have flat and uniform DLC coating layer on ZnS nanowire in spite of high residual stress induced by the high sp3fraction. To further understanding of the DLC coating layer, Raman spectroscopy was employed with ZnS/DLC core-shell nanowires, which reveals two Raman bands at 1550 cm−1(G peak) and 1330 cm−1(D peak). Finally, we investigated the optical properties from ultraviolet to infrared wavelength region using ultraviolet-visible (UV-Vis) and Fourier transform infrared (FT-IR) spectrometry. Related to optical properties, ZnS/DLC core-shell nanowires exhibit relatively lower absorbance and higher IR transmittance than that of ZnS nanowires.

Sign in / Sign up

Export Citation Format

Share Document