Analysis of Post-Deposition Recrystallization Processing via Indium Bromide of Cu(In,Ga)Se Thin Films.

Cu(In,Ga)Se (CIGS) thin films were deposited at low temperature (350 °C) and high rate (10 µm/h) by a single stage process. The effect of post-deposition treatments at 400 °C and 500 °C by indium bromide vapor were studied and compared to the effect of a simple annealing under selenium. Structural, electrical, and chemical analyses demonstrate that there is a drastic difference between the different types of annealing, with the ones under indium bromide leading to much larger grains and higher conductivity.

The existence and impact of persistent ferroelectric domains in MAPbI.

Methylammonium lead iodide (MAPbI) exhibits exceptional photovoltaic performance, but there remains substantial controversy over the existence and impact of ferroelectricity on the photovoltaic response. We confirm ferroelectricity in MAPbI single crystals and demonstrate mediation of the electronic response by ferroelectric domain engineering. The ferroelectric response sharply declines above 57°C, consistent with the tetragonal-to-cubic phase transition.

Dendritic nanostructured FeS-based high stability and capacity Li-ion cathodes.

Here we show that dendritic architectures are attractive as the basis of hierarchically structured battery electrodes. Dendritically structured FeS, synthesized simple thermal sulfidation of electrodeposited dendritic α-Fe, was formed into an electrode and cycled lithium. The reversible capacities of the dendritic FeS cathode were 560 mA h g at 0.

Computational Analysis of the Interplay between Deep Level Traps and Perovskite Solar Cell Efficiency.

New deposition methods of halide perovskites are being developed with the aim of improving solar cell power conversion efficiency by controlling the physiochemical properties of the perovskite film. In the case of methylammonium lead iodide (MAPbI), deep level traps limit efficiency by participating in charge carrier recombination. Prior work has shown that the solar cell efficiency of MAPbI solar cells varied significantly with deposition method; specifically, efficiencies of 13.