Photoluminescence Blinking of Single-Crystal Methylammonium
Lead Iodide Perovskite Nanorods Induced by Surface Traps
Posted on 2016-07-31 - 00:00
Photoluminescence
(PL) of organometal halide perovskite materials
reflects the charge dynamics inside of the material and thus contains
important information for understanding the electro-optical properties
of the material. Interpretation of PL blinking of methylammonium lead
iodide (MAPbI3) nanostructures observed on polycrystalline
samples remains puzzling owing to their intrinsic disordered nature.
Here, we report a novel method for the synthesis of high-quality single-crystal
MAPbI3 nanorods and demonstrate a single-crystal study
on MAPbI3 PL blinking. At low excitation power densities,
two-state blinking was found on individual nanorods with dimensions
of several hundred nanometers. A super-resolution localization study
on the blinking of individual nanorods showed that single crystals
of several hundred nanometers emit and blink as a whole, without showing
changes in the localization center over the crystal. Moreover, both
the blinking ON and OFF times showed power-law distributions, indicating
trapping–detrapping processes. This is further supported by
the PL decay times of the individual nanorods, which were found to
correlate with the ON/OFF states. Furthermore, a strong environmental
dependence of the nanorod PL blinking was revealed by comparing the
measurements in vacuum, nitrogen, and air, implying that traps locate
close to crystal surfaces. We explain our observations by proposing
surface charge traps that are likely related to under-coordinated
lead ions and methylammonium vacancies to result in the PL blinking
observed here.
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Yuan, Haifeng; Debroye, Elke; Caliandro, Giorgio; Janssen, Kris P.
F.; van Loon, Jordi; E. A. Kirschhock, Christine; et al. (2016). Photoluminescence Blinking of Single-Crystal Methylammonium
Lead Iodide Perovskite Nanorods Induced by Surface Traps. ACS Publications. Collection. https://doi.org/10.1021/acsomega.6b00107
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AUTHORS (9)
HY
Haifeng Yuan
ED
Elke Debroye
GC
Giorgio Caliandro
KJ
Kris P.
F. Janssen
Jv
Jordi van Loon
CE
Christine E. A. Kirschhock
JM
Johan A. Martens
JH
Johan Hofkens
MB
Maarten B. J. Roeffaers
KEYWORDS
localization centerMAPbI 3organometal halide perovskite materialsPhotoluminescence BlinkingPL decay timesexcitation power densitiesMAPbI 3 PLSurface Traps Photoluminescencesurface charge trapsnanorod PLIodide Perovskite Nanorods Inducedcrystal surfacescharge dynamicsOFF timesmethylammonium vacanciesnovel method