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We report the influence of porosity and pore size on perovskite solar cell efficiency. We demonstrate an alternative electrode synthesis route that goes beyond traditional paste processing by incorporating a second distribution of nanoparticles composed of ZnO into the TiO2 paste. After calcination to form a mesoporous film, the ZnO nanoparticles are selectively etchable under acidic conditions to...
Nanocrystalline Nb2O5 films were prepared by an extended sol-gel method. The synthesis is based on the hydrolysis of a modified Nb-alkoxide precursor. Reaction of the modified precursor (Nb(OEt)5 + 2 2,4-pentanedione) with water in ethanol leads to a homogeneous hydrolyzed solution, which is stable against precipitation of niobium oxide after evaporation of the ethanol and in the whole pH-range investigated...
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