In recent times, layered double perovskites have attracted
considerable
attention due to their nontoxic nature, structural stability in ambient
conditions, and ability to tune optoelectronic properties through
the interplay between two metal ions. To better comprehend the utility
of this promising class of materials to be used as absorber materials
in solar cells, it is important to understand the nature of band-gap
and excited-state dynamics. In this work, we present a comprehensive
study on the microcrystals of Cs4CuSb2Cl12, a relatively new class of double perovskites, which have
emerged as a propitious contender. Using dispersion-corrected density
functional theory, we study the nature of the band structure and identify
the structural and energetic parameters that are also tested experimentally.
Further, using femtosecond transient absorption spectroscopy, we show
that depending on the excitation wavelength, the excited-state relaxation
mechanism involves either excitons or free charge carriers. One crucial
observation is the solvent dependence of the relaxation rates of carriers,
opening up the possibilities of solvent control of charge carrier
dynamics.
Ultrafast electron and hole relaxation dynamics in microcrystals of a layered double-perovskite in two solvents is studied and found to proceed at different rates depending on the nature of charge carriers as well as solvents.
<div>An extract of <i>Aloe Vera</i> acts as a powerful reducing agent for the synthesis of ultrasmall copper nanoparticles (CuNPs) in water medium. The prepared copper nanoparticles are characterized by XRD, HRTEM and UV-Vis analysis. The diameter of the prepared nanoparticle is less than 5 nm. The catalytic activity of CuNPs has been successfully evaluated for the three-component reaction to synthesize 1,2,3-triazoles and chalcone tethered 1,2,3-triazoles with low catalyst loading and under mild reaction conditions. These triazoles are further utilized for the synthesis of dihydropyrazines.</div>
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