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Direct Synthesis of Highly Conductive tert-Butylthiol-Capped CuInS2 Nanocrystals

Aurelie Lefrancois 1 Stephanie Pouget 2 Louis Vaure 1 Miguel Lopez-Haro 3 Peter Reiss 1
1 LEMOH - Laboratoire d'Electronique Moléculaire Organique et Hybride
SYMMES - SYstèmes Moléculaires et nanoMatériaux pour l’Energie et la Santé : DRF/INAC/SYMMES
2 SGX [?-2019] - Service Général des Rayons X [?-2019]
MEM - Modélisation et Exploration des Matériaux : DRF/IRIG/MEM
3 LEMMA [?-2019] - Laboratoire d'Etude des Matériaux par Microscopie Avancée [?-2019]
MEM - Modélisation et Exploration des Matériaux : DRF/IRIG/MEM
Abstract : tert-butylthiol (tBuSH) is used as the sulfur source, surface ligand and co-solvent in the synthesis of CuInS2 nanocrystals (NCs). The presented method gives direct access to short-ligand-capped NCs without post-synthetic ligand exchange. The obtained 5nm CuInS2 NCs crystallize in the cubic sphalerite phase with space group F-43m and a lattice parameter a=5.65 angstrom. Their comparably large optical and electrochemical band gap of 2.6-2.7eV is attributed to iodine incorporation into the crystal structure as reflected by the composition Cu1.04In0.96S1.84I0.62 determined by EDX. Conductivity measurements on thin films of the tBuSH-capped NCs result in a value of 2.5(.)10(-2)Sm(-1), which represents an increase by a factor of 400 compared to established dodecanethiol-capped CuInS2 NCs.
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https://hal-cea.archives-ouvertes.fr/cea-01849841
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Submitted on : Thursday, July 26, 2018 - 3:15:20 PM
Last modification on : Monday, July 20, 2020 - 2:20:03 PM

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Aurelie Lefrancois, Stephanie Pouget, Louis Vaure, Miguel Lopez-Haro, Peter Reiss. Direct Synthesis of Highly Conductive tert-Butylthiol-Capped CuInS2 Nanocrystals. ChemPhysChem, Wiley-VCH Verlag, 2016, 17 (5), pp.654-659. ⟨10.1002/cphc.201500800⟩. ⟨cea-01849841⟩

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