Inverted Perovskite Photovoltaics Using Flame Spray Pyrolysis Solution Based CuAlO2/Cu-O Hole-Selective Contact.

We present the functionalization process of a conductive and transparent CuAlO2/Cu-O hole-transporting layer (HTL). The CuAlO2/Cu-O powders were developed by flame spray pyrolysis and their stabilized dispersions were treated by sonication and centrifugation methods. We show that when the supernatant part of the treated CuAlO2/Cu-O dispersions is used for the development of CuAlO2/Cu-O HTLs the corresponding inverted perovskite-based solar cells show improved functionality and power conversion efficiency of up to 16.3% with negligible hysteresis effect.

Colloidal BiF3 nanocrystals: a bottom-up approach to conversion-type Li-ion cathodes.

A facile colloidal synthesis of BiF3 nanocrystals (NCs) via thermal decomposition of bismuth(III) trifluoroacetate in oleylamine is reported. The NC size can be tuned from 6 to 40 nm by the adjustment of synthesis parameters. After removal of the capping surfactant molecules, BiF3 NCs were tested as a cathode material for Li-ion batteries. Close to theoretical Li-ion storage capacities of up to 300 mA h g(-1) at an average voltage of 3 V were obtained at a current density of 50 mA g(-1).