Chalcopyrite nanomaterials have properties that make them promising candidates for photovoltaic and other semiconductor applications. A single-source method of synthesizing Cu(In/Ga)S2 chalcopyrites from (PPh3)2Cu(In/Ga)(SR)4 molecules has been shown to control stoichiometry, phase, and particle size. However, recent study of these precursor structures suggests that they readily dissociate in solution, calling into question the advantage of the single-source method for this target. Herein we describe side-by-side comparisons of the progress and products of single-source and multi-source routes. These studies aim to locate key commonalities and differences between the two routes, and to gauge the significance of specific thermolysis parameters such as thiolate group, phosphine, additives, and temperature. Reaction outcomes are evaluated using NMR, TGA, ICP, XRD, and SEM to explore whether the single-source method is actually preferable over the directly analogous multi-source route.

Single-source vs multi-source approaches to chalcopyrite nanomaterials

2019 Fall National Meeting

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