Perovskite solar cells based on (CH3NH3)Pb(I,Cl)3 have recently demonstrated rapidly increasing cell efficiencies. Here, we show progress identifying phases present during the growth of (CH3NH3)Pb(I,Cl)3 perovskite thin films with the vacuum-based coevaporation approach using two sources under varying deposition conditions. With in situ X-ray diffraction, crystalline phases can be identified and monitored in real time. For different (CH3NH3)I-to-PbCl2 flux ratios, two distinct (CH3NH3)Pb(IxCl(1-x))3 phases with high (x > 0.95) and with lower (x < 0.5) iodine content as well as a broad miscibility gap in-between were found. During post deposition annealing we observe recrystallization and preferential orientation effects and finally the decomposition of the perovskite film to PbI2 at temperatures above 200 °C.
A number of patents on BA analogs for the chemotherapy of cancer have been reported between 2008 and 2013. Most of these patents deal with modifications at positions C-3, C-20 and C-28. There are only a few compounds meeting the needs of a sufficient hydrosolubility, while retaining high cytotoxicity and selectivity toward tumor cells. Thus, one might expect that there will be some efforts in developing molecules of improved solubility and to find new and more efficient forms of administration (liposomes, transdermal application and nanoemulsions). An important sideline might be the treatment of the age-dependent degeneration of the macula, a possible caveat of which might be a certain degree of CNS toxicity associated with several derivatives of BA.
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