Abstract: The present invention relates to a process for preparing polycarbonate comprising copolymerizing an epoxy compound and carbon dioxide (CO2) in the presence of a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds, as well as to a catalytic system comprising: at least one catalyst selected from complexes of a transition metal; at least one co-catalyst selected from ionic compounds.

Abstract: The present invention provides a method for removing metal and/or metal oxide contamination from the interior of a vacuum coating reactor, the method comprising the steps of: a) performing an idle coating step by depositing a coating layer, wherein the coating layer comprises silicon; b) at least partly removing the deposited coating layer. The method according to the invention is particularly suitable for cleaning reactors in the context of solar cell manufacturing. The method is time saving and cost saving.

Abstract: A multi-part transparent conductive zinc oxide layer for a photoelectric conversion device, and a method of producing same. The transparent conductive zinc oxide layer includes at least one basic layer sequence with a varying boron dopant concentration. The basic layer sequence includes a thinner transparent conductive zinc oxide higher-boron-doped layer and a thicker transparent conductive zinc oxide lower-boron-doped layer. The doping density through each individual conductive zinc oxide layer is substantially constant, which is achieved by intentionally doping the thicker transparent conductive zinc oxide lower-boron-doped layer. Optionally, an interlayer may be present between the at least one basic layer sequence and the substrate or an n-doped silicon layer upon which it is disposed. This advantageously permits efficient Edge Isolation by Laser EIL ablation of the transparent conductive zinc oxide layers while maintaining good electrical and optical properties in said layers.

Abstract: The present invention provides a method for removing metal and/or metal oxide contamination from the interior of a vacuum coating reactor, the method comprising the steps of: a) performing an idle coating step by depositing a coating layer, wherein the coating layer comprises silicon; b) at least partly removing the deposited coating layer. The method according to the invention is particularly suitable for cleaning reactors in the context of solar cell manufacturing. The method is time saving and cost saving.