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Solution−Liquid−Solid Growth of Ternary Cu−In−Se Semiconductor Nanowires from Multiple- and Single-Source Precursors

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posted on 11.11.2009, 00:00 by Alfred J. Wooten, Donald J. Werder, Darrick J. Williams, Joanna L. Casson, Jennifer A. Hollingsworth
Ternary CuInSe2 nanowires were synthesized for the first time by the solution−liquid−solid (SLS) mechanism. Here, both metal−organic multiple- and single-source molecular precursors were thermally decomposed in the presence of molten metal nanoparticles and coordinating ligands. The nature of the precursormultiple- compared to single-source (wherein Cu−Se−In bonds are effectively preformed)as well as the choice of coordinating ligands, reaction temperature, and reactant order-of-addition strongly affected the morphology and composition of the reaction product obtained. Crystalline, straight, and nearly stoichiometric CuInSe2 nanowires were most readily achieved using the single-source precursor; however, careful tuning of reaction conditions could also be used to obtain high-quality nanowires from multiple-source precursor systems. The CuInSe2 nanowires are strong light absorbers from the near-infrared through the visible and ultraviolet spectral regions and, thereby, comprise new soluble and processable “building blocks” for applications in solar-light harvesting.