The nature of exciton-plasmon interactions in Au-tipped CdS nanorods and Au/CdS core/shell quantum dots have been investigated using femtosecond transient absorption spectroscopy. In the case of Au-tipped CdS nanorods, this study demonstrates that the key optoelectronic properties of composite heterostructures comprising electrically coupled metal and semiconductor domains are substantially different from those observed in systems with weak interdomain coupling. In particular, strongly coupled nanocomposites promote mixing of electronic states at semiconductor-metal domain interfaces, which causes a significant suppression of both plasmon and exciton excitations of carriers.  On the other hand, nonepitaxially bonded Au/CdS core/shell nanocrystals, avoids this mixing of states by having no interfacial epitaxy between the metal and semiconductor domains. In this case, plasmon and exciton excitations are preserved.

Effects of metal-semiconductor interface morphology on plasmon-exciton interactions in heteronanocrystals

246th National Meeting (2013)

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