Lead
halide perovskite (CsPbX3, where X = Cl, Br, or
I) quantum dots (QDs), with tunable optical and electronic properties,
have attracted attention because of their promising applications in
solar cells and next-generation optoelectronic devices. Hence, it
is crucial to investigate in detail the fundamental size-dependent
properties of these perovskite QDs to obtain high-quality nanocrystals
for practical use. We propose a direct method for determining the
concentration of solution-processed CsPbX3 QDs by means
of spectrophotometry, in which the molar absorption coefficient (ε)
is obtained using absorption and the Beer–Lambert law. By tuning
the size of CsPbX3 QDs, we obtain their corresponding ε
leading to a calibration curve for calculating the nanocrystal concentrations.
The ε at the band edge for CsPbX3 (X = Cl, Br, or
I) nanocrystals was found to be strongly dependent on the bandgap
of the nanocrystals. We also obtained a reliable size dependence of
the bandgap calibration curves to estimate the size of QDs from the
absorption spectra.
Optical and electronic properties of lead halide perovskite nanocrystals have been explored extensively for their increasing demand in photovoltaic and optoelectronic applications. But little is known about the growth kinetics...
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