  The optoelectric applications, light emitters and photovoltaics, with
organometallic halide perovskite materials have been decided by dynamics of
charge carriers in grains on the polycrystalline thin films. Especially, polar
solvent vapour recrystallizes perovskites and changes their grain sizes. In
this paper, various polar solvents were evaluated with density functional
theory calculation. And a stociometric treatment with these solvents which
enhanced photoluminescence intensity was established. The properties of
solvents which caused dramatic photoluminescence enhancement and quantum
confinement effect were discussed.
