Abstract
Dielectric properties determine by electric field distributions play a decisive role in energy harvesting and storage applications. In this context, strontium decorated lead iodide nanosheets (Sr:PbI2) are prepared, and its vibrational and dielectric properties are studied. The bandgap changes are explained by Brustein-Moss effect and renormalization process. Raman spectral studies reveal that introducing Sr atoms into PbI2 lattice enhance the lifetime of LO phonon through bottleneck effect. Subsequently, the dielectric constant (ε′) values of 5 wt% Sr:PbI2 are increased 20% than pure PbI2. The results conclude that the vibrational properties of Sr decorated PbI2 nanosheets are much significant for hot carrier solar cell devices.
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•Facile one pot microwave synthesis of Sr decorated PbI2 nanosheets (Sr:PbI2) are reported.•XRD, optical absorption spectra, and Raman analysis explore their structural and optoelectronic properties.•The role of Sr atoms on the morphological evolution of PbI2 nanosheets is discussed.•Dielectric constant and electrical conductivity values are increased for 3 and 5 wt.% Sr doping.•Sr dopants enhance the lifetime of PbI2 LO phonon with bottleneck effect, and such phenomena is very significant for hot carrier solar cell devices.