A server acts as the hub of a collaborative commerce system. The current limiting circuit includes a device coupled to an output node of the current limiting circuit. A first channel processor coupled to the first array of photo detectors generates a first image using first array data which is representative of the first intensity of light sampled by the first array of photo detectors. The content may be selected based at least in part on a relevance between the content and the request. Additionally, methods of making semiconductor devices are described that include depositing a semiconductor layer that contains a perfluoroether acyl oligothiophene compound, preferably an \u03b1,\u03c9-bis(2-perfluoroether acyl oligothiophene compound. The invention also relates to new compounds of formula, their preparation, use and compositions comprising said compound.