Adjusting the Ga grading during fast atmospheric processing of Cu(In,Ga)Se2solar cell absorber layers using elemental selenium vapor

2017 ◽  
Vol 25 (5) ◽  
pp. 341-357 ◽  
Author(s):  
Sebastian Simon Schmidt ◽  
Christian Wolf ◽  
Humberto Rodriguez-Alvarez ◽  
Jan-Peter Bäcker ◽  
Christian Alexander Kaufmann ◽  
...  
Keyword(s):  
Elemental Selenium ◽  
Atmospheric Processing ◽  
Selenium Vapor

Studies of copper selenide ultrafine particles by newly developed gas evaporation method

1990 ◽  
Vol 48 (4) ◽  
pp. 306-307
Author(s):  
Chihiro Kaito ◽  
Yoshio Saito
Keyword(s):  
Crystal Structure ◽  
Ultrafine Particles ◽  
Fine Particles ◽  
Production Method ◽  
Atmospheric Temperature ◽  
Copper Selenide ◽  
Quartz Boat ◽  
Selenium Vapor ◽  
Ar Gas ◽  
Ultra Fine Particles

The direct evaporation of metallic oxides or sulfides does not always given the same compounds with starting material, i.e. decomposition took place. Since the controll of the sulfur or selenium vapors was difficult, a similar production method for oxide particles could not be used for preparation of such compounds in spite of increasing interest in the fields of material science, astrophysics and mineralogy. In the present paper, copper metal was evaporated from a molybdenum silicide heater which was proposed by us to produce the ultra-fine particles in reactive gas as shown schematically in Figure 1. Typical smoke by this method in Ar gas at a pressure of 13 kPa is shown in Figure 2. Since the temperature at a location of a few mm below the heater, maintained at 1400° C , were a few hundred degrees centigrade, the selenium powder in a quartz boat was evaporated at atmospheric temperature just below the heater. The copper vapor that evaporated from the heater was mixed with the stream of selenium vapor,and selenide was formed near the boat. If then condensed by rapid cooling due to the collision with inert gas, thus forming smoke similar to that from the metallic sulfide formation. Particles were collected and studied by a Hitachi H-800 electron microscope.Figure 3 shows typical EM images of the produced copper selenide particles. The morphology was different by the crystal structure, i.e. round shaped plate (CuSe;hexagona1 a=0.39,C=l.723 nm) ,definite shaped p1 ate(Cu5Se4;Orthorhombic;a=0.8227 , b=1.1982 , c=0.641 nm) and a tetrahedron(Cu1.8Se; cubic a=0.5739 nm). In the case of compound ultrafine particles there have been no observation for the particles of the tetrahedron shape. Since the crystal structure of Cu1.8Se is the anti-f1uorite structure, there has no polarity.

Fate of Colloidal-Particulate Elemental Selenium in Aquatic Systems

2004 ◽  
Vol 33 (2) ◽  
pp. 559 ◽  
Author(s):  
Yiqiang Zhang ◽  
Zahir A. Zahir ◽  
William T. Frankenberger
Keyword(s):  
Aquatic Systems ◽  
Elemental Selenium

scholarly journals Optimization of elemental selenium (Se(0)) determination in yeasts by anion-exchange HPLC-ICP-MS

2021 ◽  
Author(s):  
Véronique Vacchina ◽  
Dominique Foix ◽  
Mathieu Menta ◽  
Hervé Martinez ◽  
Fabienne Séby
Keyword(s):  
Anion Exchange ◽  
Elemental Selenium ◽  
Icp Ms ◽  
Anion Exchange Hplc

scholarly journals Influence of chemical weathering and aging of iron oxides on the potential iron solubility of Saharan dust during simulated atmospheric processing

2011 ◽  
Vol 25 (2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Zongbo Shi ◽  
Michael D. Krom ◽  
Steeve Bonneville ◽  
Alex R. Baker ◽  
Charlie Bristow ◽  
...  
Keyword(s):  
Iron Oxides ◽  
Chemical Weathering ◽  
Saharan Dust ◽  
Iron Solubility ◽  
Atmospheric Processing

Comparative effects of nano elemental selenium and sodium selenite on selenium retention in broiler chickens

2012 ◽  
Vol 177 (3-4) ◽  
pp. 204-210 ◽  
Author(s):  
C.H. Hu ◽  
Y.L. Li ◽  
L. Xiong ◽  
H.M. Zhang ◽  
J. Song ◽  
...  
Keyword(s):  
Broiler Chickens ◽  
Sodium Selenite ◽  
Elemental Selenium

Novel Anti-Cancer, Anti-Bacterial Coatings for Biomaterial Applications: Selenium Nanoclusters

2009 ◽  
Vol 1209 ◽  
Author(s):  
Phong Anh Tran ◽  
Erik Taylor ◽  
Love Sarin ◽  
Robert H. Hurt ◽  
Thomas J Webster
Keyword(s):  
Bone Cells ◽  
Tumor Resection ◽  
Active Agent ◽  
In Vitro Study ◽  
Biologically Active ◽  
Elemental Selenium ◽  
Orthopedic Implant ◽  
Functional Coating ◽  
Anti Cancer

AbstractTwo common problems with implantation after cancerous tumor resection are cancer recurrence and bacteria infection at the implant site. Tumor resection surgery sometimes can not remove all the cancerous cells, thus, cancer can return after implantation. In addition, bacteria infection is one of the leading causes of implant failure. Therefore, it is desirable to have anti-cancer and anti-bacterial molecules which both rapidly (for anti-infection purposes) and continuously (for anti-cancer purposes) are available at the implant site following implantation. Therefore, the objective of the present in vitro study was to create a multi-functional coating for anti-cancer and anti-bacterial orthopedic implant applications. Elemental selenium was chosen as the biologically active agent in this effort because of its known chemopreventive and anti-bacterial properties. To achieve that objective, titanium (Ti), a conventional orthopedic implant material was coated with selenium (Se) nanoclusters. Different coating densities were achieved by varying Se concentration in the reaction mixture. Titanium substrates coated with Se nanoclusters were shown to enhance healthy osteoblast (bone-forming cell) and inhibit cancerous osteoblast proliferation in co-culture experiments. Functions of S. epidermidis (one of the leading bacteria that infect implants) were inhibited on Ti coated with Se-nanoclusters compared to uncoated materials. Thus, this study provided for the first time a coating material (selenium nanoclusters) to the biomaterials’ community to promote healthy bone cells’ functions, inhibit cancer growth and prevent bacteria infection.

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