The present invention is premised upon an improved photovoltaic cell assembly that include at least plurality of photovoltaic cells with a photoactive portion with a top surface, a top collection structure on the top surface and an opposing conductive substrate layer on a side of the photoactive portion opposite the top surface. The method consists of at least 5 chromatographic purification steps, i. The polyester-ether polyols of the instant invention are preferably the reaction product of phthalic anhydride, diethylene glycol, and propylene oxide. The fiber optic element can include two fiber optic elements coupled to the test region. Since the target end of update marker may cause several presenter updates to be included in a given viewer update, some of the commands in the update queue may not need to be transmitted to the viewer.