Abstract
One intriguing aspect of mixed halide lead perovskites (e.g., CH3NH3PbBrxI3–x) is halide ion segregation when subjected to visible illumination, but this aspect gives rise to the concerns regarding the influence of halide ion movement on the long–term stability and applications. Here, the impact of light illumination on mixed halide hybrid perovskite films was investigated by exposing such films to continuous wavelength laser (25 mW/cm2). It turns out that under illumination the segregated iodide-rich perovskite species further decompose and ultimately form metallic lead (Pb0). The chemical changes in decomposed films were found to cause an irreversible shift of the absorption band edge and a significant change in film morphology, while no decomposition of MAPbI3 and MAPbBr3 films was observed after exposure to the same illumination condition. Our results unambiguously demonstrate the deleterious effect of phase segregation on material stability for mixed halide perovskites.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
