Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
Ternary copper indium sulfide nanocrystals show absorption and emission properties in the visible and near infrared spectral range, which depend on their size, composition, crystalline phase and surface state. They are potential candidates for replacing cadmium based quantum dots in divers applications [1]. One of the most widely applied synthesis methods of CuInS2 nanocrystals is the reaction of indium acetate and copper iodide with dodecanethiol (DDT) at elevated temperature. DDT, eventually diluted with 1-octadecene, plays the triple role of sulphur source, surface ligand and solvent in this reaction [2,3]. We investigate by means of advanced NMR techniques the pre- and post-nucleation stages. Furthermore, synchrotron X-ray diffraction has been applied to monitor in situ nucleation and growth. As a result, the reaction mechanism as well as the surface state of the obtained CuInS2 nanocrystals can be described in details. Our results reveal the presence of a dense layer of organics at the nanocrystal surface inhibiting conventional ligand exchange strategies. We propose solutions to overcome this problem and give examples of device integration of CuInS2 nanocrystals, in particular in quantum dot sensitised solar cells. Unprecedented high power conversion efficiency has been obtained in combination with a p-type nanostructured oxide as the support for nanocrystals adsorption.
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