Creation and annealing of metastable defect states in CH3NH3PbI3 at low temperatures

F. Lang, O. Shargaieva, V. V. Brus, J. Rappich, N. H. Nickel

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6 Citations (Scopus)

Abstract

Methylammonium lead iodide (CH3NH3PbI3), an organic-inorganic perovskite widely used for optoelectronic applications, is known to dissociate under illumination with light at photon energies around 2.7 eV and higher. Here, we show that photo-induced dissociation is not limited to ambient temperatures but can be observed even at 5 K. The photo-induced dissociation of N-H bonds results in the formation of metastable states. Photoluminescence (PL) measurements reveal the formation of defect states that are located 100 meV within the bandgap. This is accompanied by a quenching of the band-to-band PL by one order of magnitude. Defect generation is reversible and annealing at 30 K recovers the band-to-band PL, while the light-induced defect states disappear concurrently.

Original languageEnglish
Article number081102
JournalApplied Physics Letters
Volume112
Issue number8
DOIs
Publication statusPublished - Feb 19 2018
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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