A large-grained perovskite film, with a crystal grain size of ca. 30-50 μm, was achieved by polyoxometalate-induced Ostwald ripening. Aiming at commercially-oriented fully printable hole-conductor-free perovskite solar cells, the power conversion efficiency of the device was significantly improved from 9.17% to 11.35% (average) via polyoxometalate molecular doping. This is because the large-grained perovskite film could effectively reduce bulk defects and charge recombination, thereby facilitating charge transport.
Co3N nanoparticles were decorated on Cd0.5Zn0.5S as highly efficient co-catalysts via a facile method. The H2 evolution activity of Co3N(2 wt%)/Cd0.5Zn0.5S is 25 times higher than that of pure Cd0.5Zn0.5S.
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