Influence of moisture on the preparation, crystal structure, and photophysical properties of organohalide perovskites.
The effect of preparing lead-based organohalide perovskites under inert conditions has been investigated. We find that when prepared under anhydrous conditions, only poorly crystalline powders were obtained. On exposure to small amounts of moisture a rapid crystallization into the expected cubic unit cell for CH3NH3PbBr3 and tetragonal cell for CH3NH3PbI3 is observed. While the as-prepared iodide phase is non-emissive, the lifetime of the emission for the bromide is found to be much longer when prepared under atmospheric conditions.
Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA. melot@usc.edu.
Kelsey K
KK
Bass
R Eric
RE
McAnally
Shiliang
S
Zhou
Peter I
PI
Djurovich
Mark E
ME
Thompson
Brent C
BC
Melot