Ternary Metal Chalcogenides: Into the Exciton and Biexciton Dynamics

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Abstract
Intra-bandgap state induced low-toxic colloidal I-III-VI ternary metal chalcogenides nanocrystals (NCs) have emerged as promising alternatives to the toxic Cd- and Pb-chalcogenides, for different optoelectronic and bioimaging applications. In this perspective, we provided the primary understanding of the intra-bandgap state induced photoluminescence (PL) of I-III-VI NCs, specifically CuInS2 and AgInS2, as a function of particle size, composition and correlated with the time resolved PL measurement. The intra-bandgap state induced ultrafast exciton and biexciton dynamics have been discussed in detail to unravel the sub-picosecond carrier relaxation dynamics through transient absorption measurement. Furthermore, ultrafast dissociation of the biexciton on [email protected] hybrid NCs has been revealed due to presence of Au which has direct relevance to the improvement of the solar cell efficiency. The proper fundamental insight of the ultrafast exciton and biexciton dynamics of these materials will enable utilization of ternary metal chalcogenides in photovoltaic as well as light emitting devices.

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