Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Schematic representation of the CH3NH3PbI3 formation during the annealing process. (a,b) Perovskite crystallites (gray regions) form in a medium comprising a PbI2-related precursor (yellow region). (c) All crystallites form at the expense of the precursor. (d,e) Crystal growth takes place as different crystallites coalesce. Insets show photographs of the samples at different stages of the annealing process: 5, 10, 20, 40, and 90 min.
