The
degradation of organic–inorganic hybrid perovskite (OHP)
films is a crucial issue in OHP optoelectronics. Herein, we investigate
the degradation process of OHP films by simultaneous measurement of
topography and infrared absorption mapping images using photothermal
induced resonance spectroscopy. By tracking the intensity of molecular
vibration, we found that oxygen and moisture are easily attached at
the grain boundary (GB) rather than at the grain interior of the OHP
film. These data are well matched with photoluminescence (PL) mapping
images, which show that the PL intensity of PbI2 as an
indicator of degradation is relatively intense at the GB. Thus, by
using correlated structural, chemical, and optical analyses, we confirm
that the degradation of the OHP film is initiated at the GB through
the attached oxygen molecules and moisture. We expect that this study
will contribute to solving the degradation issue and enhancing the
stability of OHP optoelectronics.
Although perovskite solar cells have been widely investigated to improve the photovoltaic conversion efficiency so far, perovskite light absorbers have a severe disadvantage for commercialization due to their facile degradation...
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