Effects of isomeric transformation on characteristics of Alq3 amorphous layers prepared by vacuum deposition at various substrate temperatures

2007 ◽  
Vol 101 (12) ◽  
pp. 123708 ◽  
Author(s):  
Zhi-An Jian ◽  
Ying-Zi Luo ◽  
Jia-Ming Chung ◽  
Shiow-Jing Tang ◽  
Ming-Chin Kuo ◽  
...  
Keyword(s):  
Vacuum Deposition ◽  
Isomeric Transformation ◽  
Substrate Temperatures

Rubrene polycrystalline films growth from vacuum deposition at various substrate temperatures

2016 ◽  
Vol 439 ◽  
pp. 54-59 ◽  
Author(s):  
Ku-Yen Lin ◽  
Yan-Jun Wang ◽  
Ko-Lun Chen ◽  
Chun-Chuen Yang ◽  
Ching-Yuan Ho ◽  
...  
Keyword(s):  
Vacuum Deposition ◽  
Polycrystalline Films ◽  
Substrate Temperatures

scholarly journals Role of molecular conformations in rubrene polycrystalline films growth from vacuum deposition at various substrate temperatures

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Ku-Yen Lin ◽  
Yan-Jun Wang ◽  
Ko-Lun Chen ◽  
Ching-Yuan Ho ◽  
Chun-Chuen Yang ◽  
...  
Keyword(s):  
Vacuum Deposition ◽  
Polycrystalline Films ◽  
Molecular Conformations ◽  
Substrate Temperatures

CONDENSATION COEFFICIENTS OF SILVER, GOLD, AND COPPER IN VACUUM DEPOSITION

1958 ◽  
Vol 36 (9) ◽  
pp. 1148-1153 ◽  
Author(s):  
S. Chandra ◽  
G. D. Scott
Keyword(s):  
Room Temperature ◽  
Graphical Analysis ◽  
Vacuum Deposition ◽  
Condensation Coefficient ◽  
Complete Condensation ◽  
Substrate Temperatures

A beam of atoms striking a substrate will in general not condense completely, but some of the incident atoms will re-evaporate. The condensation coefficient– denfined as the ratio of the number of atoms condensing to the total number incident on the substrate–has been determined for silver at substrate temperatures from −30 °C to 170 °C, and for gold and copper at temperatures from 25 °C to 165 °C. For silver at room temperature the condensation coefficient is found to be 0.936, which indicates 6.4% of the incident atoms are re-evaporated or diffusely reflected. By a simple graphical analysis of the results it is shown that the temperature below which complete condensation occurs is 200 °K for silver, 230 °K for gold, and 180 °K for copper.

Thin Film Formations of Charge Transfer Complexes with Metallic Properties by Vacuum Deposition Method

1989 ◽  
Vol 173 ◽  
Author(s):  
M. Yudasaka ◽  
K. Hironaga ◽  
H. Yamochi ◽  
K. Nakanishi ◽  
G. Saito
Keyword(s):  
Charge Transfer ◽  
Charge Transfer Complex ◽  
Charge Transfer Complexes ◽  
Deposition Method ◽  
Vacuum Deposition ◽  
Supply Rate ◽  
Crystalline Films ◽  
A Charge ◽  
Substrate Temperatures ◽  
Vacuum Deposition Method

ABSTRACTThin films of a charge transfer complex, hepta-(tetrathiafulvalene) pentaiodide ( TTF7I5, TTF:I0-71 ), were prepared by double source evaporation of TTF and iodine. Crystalline films of TTF:I0-7i were obtained when substrate temperatures were kept between 0°C and 25°C. Orientation alignment of the crystalline films were affected by supply rate of iodine. By controlling the substrate temprature and the supply rate of iodine, highly oriented crystalline films were grown on mica substrates. It showed strong dichroism and anisotropic electrical propert ies.

Growth and morphology of crystals in vacuum-deposited tellurium films

1978 ◽  
Vol 36 (1) ◽  
pp. 154-155
Author(s):  
M. Shiojiri ◽  
Y. Saito ◽  
M. Sato
Keyword(s):  
Electron Microscope ◽  
Film Thickness ◽  
Room Temperature ◽  
Quartz Crystal ◽  
Carbon Films ◽  
Hexagonal Structure ◽  
Vacuum Deposition ◽  
Initial Stage ◽  
Substrate Temperatures ◽  
Deposited Films

Crystals of Te prepared by vacuum-deposition on cleaved NaCl surfaces at temperatures ranging from 20 to 140°C have been studied by SEM and TEM observations. The deposition was done at a deposition rate of 0.3 nm/s, monitored with quartz crystal oscillating microbalance. After the deposited films were backed by carbon films, they were wet-stripped from the substrates and mounted on standard electron microscope grids.Figure 1 shows electron micrographs of the films in different thicknesses which were prepared at different substrate temperatures. At the initial stage of deposition, spherical or polyhedral crystallites with the hexagonal structure grew with random orientations on the substrates. On the substrate at room temperature, the crystallites became large keeping the same shape and the number of the crystallites increased, as the film thickness increased. On the substrates above 80°C, they grew into slender crystals elongating along the c-axes, with increasing film thickness. The number of crystals did not increased so much.

scholarly journals Characterization of coumarin-6 polycrystalline films growth from vacuum deposition at various substrate temperatures

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Ko-Lun Chen ◽  
Hui-Ting Liu ◽  
Jang-Hung Yu ◽  
Yung-Hsiang Tung ◽  
Yun-Syuan Chou ◽  
...  
Keyword(s):  
Vacuum Deposition ◽  
Polycrystalline Films ◽  
Substrate Temperatures ◽  
Coumarin 6

A New Fine-Structure Observed in Electron-Diffraction Rings

1973 ◽  
Vol 31 ◽  
pp. 48-49
Author(s):  
J. M. Corbett ◽  
J. Fairchild ◽  
F. W. Boswell
Keyword(s):  
Fine Structure ◽  
Electron Diffraction ◽  
Vacuum Deposition ◽  
Smoke Particles

Fine-structure in spotty electron diffraction riiig patterns has previously been observed for specimens made up of MgO smoke particles of cubic morphology. This fine-structure was shown to arise from refraction effects in the small cubes (Sturkey & Frevel). We have recently observed a different type of fine structure in patterns from MgO films prepared by vacuum deposition (Fig. 1). This fine-structure consists of sets of regularly spaced fringes occurring at random orientations in the rings. The fringes may be seen in Fig. 2 which shows a segment of the (200) ring magnified 7x from the pattern in Fig. 1. It was considered possible that each set of fringes might arise from two superimposed diffraction’ spots from suitably situated crystallites in the specimen. Experiments have been conducted which clearly demonstrate that the fringes do in fact arise in this way.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

Observations on the growth of barium bismuth oxide thin films

1992 ◽  
Vol 50 (1) ◽  
pp. 76-77
Author(s):  
M G. Norton ◽  
E.S. Hellman ◽  
E.H. Hartford ◽  
C.B. Carter
Keyword(s):  
Substrate Temperature ◽  
Deposition Process ◽  
Nucleation Layer ◽  
Second Stage ◽  
Device Applications ◽  
High Transition ◽  
Substrate Temperatures ◽  
Oriented Material ◽  
Barium Bismuth ◽  
Superconductor Device

The bismuthates (for example, Ba1-xKxBiO3) represent a class of high transition temperature superconductors. The lack of anisotropy and the long coherence length of the bismuthates makes them technologically interesting for superconductor device applications. To obtain (100) oriented Ba1-xKxBiO3 films on (100) oriented MgO, a two-stage deposition process is utilized. In the first stage the films are nucleated at higher substrate temperatures, without the potassium. This process appears to facilitate the formation of the perovskite (100) orientation on (100) MgO. This nucleation layer is typically between 10 and 50 nm thick. In the second stage, the substrate temperature is reduced and the Ba1-xKxBiO3 is grown. Continued growth of (100) oriented material is possible at the lower substrate temperature.

TEM Study of Co/Pd and Co/Au Multilayers

1993 ◽  
Vol 51 ◽  
pp. 1036-1037
Author(s):  
A.E.M. De Veirman ◽  
F.J.G. Hakkens ◽  
W.M.J. Coene ◽  
F.J.A. den Broeder
Keyword(s):  
Magnetic Anisotropy ◽  
Ion Beam ◽  
Perpendicular Magnetic Anisotropy ◽  
Optical Recording ◽  
Magnetic Multilayer ◽  
Ion Beam Sputtering ◽  
Cross Sectional ◽  
Transmission Electron ◽  
Beam Sputtering ◽  
Substrate Temperatures

There is currently great interest in magnetic multilayer (ML) thin films (see e.g.), because they display some interesting magnetic properties. Co/Pd and Co/Au ML systems exhibit perpendicular magnetic anisotropy below certain Co layer thicknesses, which makes them candidates for applications in the field of magneto-optical recording. It has been found that the magnetic anisotropy of a particular system strongly depends on the preparation method (vapour deposition, sputtering, ion beam sputtering) as well as on the substrate, underlayer and deposition temperature. In order to get a better understanding of the correlation between microstructure and properties a thorough cross-sectional transmission electron microscopy (XTEM) study of vapour deposited Co/Pd and Co/Au (111) MLs was undertaken (for more detailed results see ref.).The Co/Pd films (with fixed Pd thickness of 2.2 nm) were deposited on mica substrates at substrate temperatures Ts of 20°C and 200°C, after prior deposition of a 100 nm Pd underlayer at 450°C.

Sign in / Sign up

Export Citation Format

Share Document