Metal Halide Perovskites Demonstrate Radiation Hardness and Defect Healing in Vacuum.

Herein, we subject formamidinium lead iodide films to oxygen-containing gases (flowing O or free diffusion of lab atmosphere), inert gases (flowing He, Ar, or N), and vacuum. Our films are irradiated by Cu Kα X-rays and held at 75 °C while X-ray diffraction is recorded. Under all gas conditions, we observe a reproducible 1.

Isobutrin from butea monosperma (flame of the forest): a promising new natural sensitizer belonging to chalcone class.

In this work, "isobutrin", an ecofriendly sensitizer that is extracted from Butea monosperma (commonly known as "Flame of the Forest") flowers, is introduced. It is a bright yellow pigment belonging to the chalcone class and is examined as a sensitizer for optoelectronic applications. It is observed that chelation of this dye with Ti ions results into a strong dye-TiO(2) charge transfer (DTCT) band in the visible region.