期刊
APPLIED PHYSICS LETTERS
卷 112, 期 8, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.5019921
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资金
- Graduate School Hybrid4Energy
- Alexander-von-Humboldt Foundation
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. Published by AIP Publishing.
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