Components that click: A large number of diverse dendrimers (see scheme) was prepared in almost quantitative yield by the click‐chemistry transformation described in the title. In some cases filtration or solvent extraction was the only method required for purification in this highly efficient construction of the triazole units of the dendrimers.

Krebs et al. Scalable, ambient atmosphere roll-to-roll manufacture of encapsulated large area, fl exible organic tandem solar cell modules

We present a cost analysis based on state of the art printing and coating processes to fully encapsulated, flexible ITO-and vacuum-free polymer solar cell modules. Manufacturing data for both single junctions and tandem junctions are presented and analyzed. Within this calculation the most expensive layers and processing steps are identified. Based on large roll-to-roll coating experiments the exact material consumptions were determined. In addition to the data for the pilot scale experiment presented here, projections to medium and large scale scenarios serve as a guide to achieve cost targets of 5 Vct per W p in a detailed material and cost analysis. These scenarios include the replacement of cost intensive layers, as well as process optimization steps. Furthermore, the cost structures for single and tandem devices are listed in detail and discussed. In an optimized model the material costs drop below 10 V per m 2 which proves that OPV is a competitive alternative to established power generation technologies. Broader contextAmong the emerging solar cell technologies organic photovoltaics (OPVs) have gained enormous attraction due to their various advantages in applications, i.e. light weight, semitransparency, tunable band gaps and colors. The decisive criteria for a market entrance of a new renewable technology to become a successful competitor are the costs and cost potential which are inuenced by their processing technique. Currently processing of photovoltaic devices is mainly done in non-continuous batch-to-batch processes at elevated temperatures. OPVs offer the advantage of high throughputs due to their compatibility to continuous rollto-roll coating techniques. This leads to the potential to dramatically reduce the processing costs in comparison to mature photovoltaic technologies. One of the drawbacks of OPVs is their lower device efficiency in comparison to inorganic materials. The use of tandem devices offers the potential to overcome the limiting device efficiency of OPVs which requires the printing of several additional layers. Based on state of the art processing costs the exact material consumptions for single and tandem devices were determined and compared. We demonstrate that OPV is a competitive energy technology which is not only compatible with inorganic PV, but also with other energy technologies such as wind, hydro and biomass.

Summary: Novel hyperbranched poly([1,2,3]‐triazole)s were synthesized from several AB2 monomers by a 1,3‐dipolar cycloaddition reaction. The compound 3,5‐bis(propargyloxy)benzyl azide was polymerized thermally at room temperature leading to 1,4‐ and 1,5‐disubstituted poly([1,2,3]‐triazole) and catalytically leading only to the 1,4‐disubstituted poly([1,2,3]‐triazole). Only the thermal reaction led to fully soluble products. The AB2 monomers containing an internal alkyne A unit could be autopolymerized thermally under mild reaction conditions leading to soluble, high‐molecular‐weight hyperbranched poly([1,2,3] triazole)s. All products were characterized by detailed NMR investigations.Synthesis route for polymers 8a and 8b.imageSynthesis route for polymers 8a and 8b.