What is it about?
Two emission states with band-energy ∼2.22 eV (557nm) and ∼2.31 eV (557nm) of CH3NH3PbBr3 are originated from free exciton and free carrier recombination which are attributed to the coexistence of a non-centrosymmetric tetragonal phase and a centrosymmetric cubic phase for CH3NH3PbBr3 microcrystals at higher temperature (>160 K).
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Why is it important?
A clear insight into the crystal phase related emission mechanism is demonstrated in CH3NH3PbBr3.
Perspectives
Our results can provide the orientation for the synthesis of perovskite semiconductor materials with a perfectly aligned lattice structure and improve the perovskite based devices.
Feng Chen
Southeast University
Read the Original
This page is a summary of: Crystal structure and electron transition underlying photoluminescence of methylammonium lead bromide perovskites, Journal of Materials Chemistry C, January 2017, Royal Society of Chemistry,
DOI: 10.1039/c7tc01945a.
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