We were the first to demonstrate that colloidal oxide and chalcogenide nanocrystals could be synthesized using one general reaction scheme by simply varying a common dichalcogenide precursor (R-E-E-R; where E = O, S, Se, Te and R = tBu, Bn, Ph, etc.). This is the only precursor that can function as a common transfer reagent for all of the group VI elements through tellurium. Dichalcogenides have proven to be effective precursors for a very wide variety of colloidal nanocrystals, including many previously undiscovered metastable phases. Along these lines, we recently leveraged the tunability of dichalcogenide precursors to allow for molecular programming of the resulting nanocrystal phase. We demonstrated that the C–Se bond strength of the dichalcogenide precursor is phase determining for CuInSe2 nanocrystals, with stronger C–Se bonds leading to a metastable wurtzite-like phase that is kinetically persistent. This talk will discuss these results and the extension of this concept to the molecular programming of other metastable phases of multinary chalcogenide nanocrystals.

Molecular programming the phase determination of colloidal nanocrystals with dichalcogenide precursors

2019 Fall National Meeting

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