57 research outputs found
Electroplating of CdTe thin films from cadmium sulphate precursor and comparison of layers grown by 3-electrode and 2-electrode systems
Electrodeposition of CdTe thin films was carried out from the late 1970s using the
cadmium sulphate precursor. The solar energy group at Sheffield Hallam University has carried out
a comprehensive study of CdTe thin films electroplated using cadmium sulfate, cadmium nitrate and
cadmium chloride precursors, in order to select the best electrolyte. Some of these results have been
published elsewhere, and this manuscript presents the summary of the results obtained on CdTe layers
grown from cadmium sulphate precursor. In addition, this research program has been exploring the
ways of eliminating the reference electrode, since this is a possible source of detrimental impurities,
such as K+ and Ag+ for CdS/CdTe solar cells. This paper compares the results obtained from CdTe
layers grown by three-electrode (3E) and two-electrode (2E) systems for their material properties and
performance in CdS/CdTe devices. Thin films were characterized using a wide range of analytical
techniques for their structural, morphological, optical and electrical properties. These layers have
also been used in device structures; glass/FTO/CdS/CdTe/Au and CdTe from both methods have
produced solar cells to date with efficiencies in the region of 5%–13%. Comprehensive work carried
out to date produced comparable and superior devices fabricated from materials grown using
2E system
Uma revisão sobre polimerização de olefinas usando catalisadores Ziegler-Natta heterogêneos
Serguéï Sémionovitch NAMETKINE (1876-1950). Son oeuvre Serguei Semionovitch Nametkine (1876-1950). His Achievements
Contribution de la chimie des oligo-oléfines
L'article est consacré à l'analyse des données de la littérature et des résultats expérimentaux relatifs à l'oligomérisation des oléfines en présence de complexes de métaux de transition. On examine l'influence des différents acides de Lewis et des phosphines sur l'activité catalytique et la sélectivité des catalyseurs de dimérisation des oléfines. Un mécanisme possible d'oligomérisation des oléfines par les complexes 7r-allyliques du nickel est proposé à partir des données expérimentales obtenues
Possibility of the polymerization of ethylene in presence of lithium hydride, aluminum halide, and titanium tetrachloride
Preparation of crystalline polypropylene by the polymerization of technical propene in presence of triisobutylaluminum and titanium tetra chloride
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