Band transport and localised states in modelling the electric switching of chalcogenide materials

2019 ◽  
Vol 19 (1) ◽  
pp. 128-136
Author(s):  
Rossella Brunetti ◽  
Carlo Jacoboni ◽  
Enrico Piccinini ◽  
Massimo Rudan
Keyword(s):  
Localised States ◽  
Chalcogenide Materials

Singular localised states in quasiperiodic GaAs/AlxGa1 −xAs Fibonacci superlattices

2006 ◽  
Vol 35 (2) ◽  
pp. 113-116 ◽  
Author(s):  
Z. Aziz ◽  
S. Bentata ◽  
R. Djelti
Keyword(s):  
Localised States

scholarly journals SnS2/TiO2 Nanocomposites for Hydrogen Production and Photodegradation Under Extended Solar Irradiation

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 589
Author(s):  
Sivagowri Shanmugaratnam ◽  
Balaranjan Selvaratnam ◽  
Aravind Baride ◽  
Ranjit Koodali ◽  
Punniamoorthy Ravirajan ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Hydrogen Evolution ◽  
Environmental Remediation ◽  
High Performance ◽  
Degradation Mechanism ◽  
Solar Irradiation ◽  
Earth Abundant ◽  
Improved Performance ◽  
Chalcogenide Materials

Earth–abundant transition metal chalcogenide materials are of great research interest for energy production and environmental remediation, as they exhibit better photocatalytic activity due to their suitable electronic and optical properties. This study focuses on the photocatalytic activity of flower-like SnS2 nanoparticles (composed of nanosheet subunits) embedded in TiO2 synthesized by a facile hydrothermal method. The materials were characterized using different techniques, and their photocatalytic activity was assessed for hydrogen evolution reaction and the degradation of methylene blue. Among the catalysts studied, 10 wt. % of SnS2 loaded TiO2 nanocomposite shows an optimum hydrogen evolution rate of 195.55 µmolg−1, whereas 15 wt. % loading of SnS2 on TiO2 exhibits better performance against the degradation of methylene blue (MB) with the rate constant of 4.415 × 10−4 s−1 under solar simulated irradiation. The improved performance of these materials can be attributed to the effective photo-induced charge transfer and reduced recombination, which make these nanocomposite materials promising candidates for the development of high-performance next-generation photocatalyst materials. Further, scavenging experiments were carried out to confirm the reactive oxygen species (ROS) involved in the photocatalytic degradation. It can be observed that there was a 78% reduction in the rate of degradation when IPA was used as the scavenger, whereas around 95% reduction was attained while N2 was used as the scavenger. Notably, very low degradation (<5%) was attained when the dye alone was directly under solar irradiation. These results further validate that the •OH radical and the superoxide radicals can be acknowledged for the degradation mechanism of MB, and the enhancement of degradation efficiency may be due to the combined effect of in situ dye sensitization during the catalysis and the impregnation of low bandgap materials on TiO2.

Synthesis of New Chalcogenide Materials. The Novel One-Dimensional Semiconductor K4 Ti3 S14

1987 ◽  
Vol 97 ◽  
Author(s):  
Steven A. Sunshine ◽  
Doris Kang ◽  
James A. Ibers
Keyword(s):  
Electrical Conductivity ◽  
Solid State ◽  
Alkali Metal ◽  
The Novel ◽  
Conductivity Measurements ◽  
One Dimensional ◽  
General Utility ◽  
Solid State Materials ◽  
Chalcogenide Materials

ABSTRACTThe use of A2 Q/Q melts (A - alkali metal, Q - S or Se) for the synthesis of new one-dimensional solid-state materials is found to be of general utility and is illustrated here for the synthesis of K4 Ti3 SI4. Reaction of Ti metal with a K2 S/S melt at 375°C for 50 h affords K4 Ti3 SI4. The structure possesses one-dimensional chains of seven and eightcoordinate Ti atoms with each chain isolated from all others by surrounding K atoms. There are six S-S pairs (dave - 2.069(3) Å) so that the compound is one of TiIV and may be described as K4 [Ti3 (S)2 (S2)6]. Electrical conductivity measurements indicate that this material is a semiconductor.

Metalorganic chemical vapor deposition of non-GST chalcogenide materials for phase change memory applications

2010 ◽  
Vol 20 (9) ◽  
pp. 1751 ◽  
Author(s):  
Jun-Ku Ahn ◽  
Kyoung-Woo Park ◽  
Sung-Gi Hur ◽  
Nak-Jin Seong ◽  
Chung-Soo Kim ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Phase Change ◽  
Vapor Deposition ◽  
Metalorganic Chemical Vapor Deposition ◽  
Phase Change Memory ◽  
Chemical Vapor ◽  
Memory Applications ◽  
Chalcogenide Materials ◽  
Change Memory ◽  
Metalorganic Chemical

Effect of reaction temperature on the average crystallite size of SexTe1−x alloys

1986 ◽  
Vol 1 (2) ◽  
pp. 234-236 ◽  
Author(s):  
Santokh S. Badesha ◽  
George T. Fekete ◽  
Ihor Tarnawskyj
Keyword(s):  
Crystallite Size ◽  
Small Particle ◽  
Chemical Method ◽  
Average Crystallite Size ◽  
Organic Media ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrophotographic Properties ◽  
Dark Decay ◽  
Chalcogenide Materials

Electrophotographic properties of chalcogenide materials are readily influenced by altering their composition and/or structure. Dark decay and cycle down of photoreceptors utilizing small particle generators are both directly proportional to average crystallite size (ACS). This paper describes a novel chemical method to control the ACS of Se, Te, and Sex Te1−x alloys. These chalcogenide materials are prepared as powders by the reduction or coreduction of SeIV and/or TeIV intermediates with hydrazine, in organic media. To control the ACS of precipitated chalcogens the reaction is carried out at the desired temperature. X-ray diffraction measurements are used to determine the ACS, homogeneity, and phase of these precipitated powders.

The energy distribution of localised states, and the mobilities of free carriers in a-Si:H, from time of flight and other measurements

1987 ◽  
Vol 97-98 ◽  
pp. 563-566 ◽  
Author(s):  
J.M. Marshall ◽  
R.A. Street ◽  
M.J. Thompson ◽  
W.B. Jackson
Keyword(s):  
Energy Distribution ◽  
Time Of Flight ◽  
Free Carriers ◽  
Localised States

Sensitive measurement of optical nonlinearity in amorphous chalcogenide materials in nanosecond regime

2012 ◽  
Vol 93 ◽  
pp. 135-139 ◽  
Author(s):  
Sunita Rani ◽  
Devendra Mohan ◽  
Nawal Kishore ◽  
Purnima
Keyword(s):  
Optical Nonlinearity ◽  
Amorphous Chalcogenide ◽  
Chalcogenide Materials
Sign in / Sign up

Export Citation Format

Share Document