DOI: https://doi.org/10.29363/nanoge.emlem.2022.015
Publication date: 15th July 2022
Colloidal semiconductor nanocrystals (NCs) emitting in the near-infrared (NIR) are of particular interest as they can find application in telecommunications to night vision, photovoltaics, lasing, and in vivo biological imaging.[1] Since the most developed NIR emitting materials are very toxic, being Pb- or Hg-based chalcogenides, the current trend is to move toward compounds being RoHS (European “Restriction of Hazardous Substances”) compliant.[2] In this context, the most promising NIR candidates are InAs NCs whose bandgap can be tuned from the visible up the the whole NIR range. Currently, the most advanced colloidal strategies for InAs NCs rely on pyrophoric, toxic and not commercially available tris-trimethylsilyl arsine (or derivatives).[3] Therefore, in recent years alternative synthesis routes based on less toxic and commercially available As precursors, such as tris(dimethylamino)arsine (amino-As), have been explored.[4] Such procedures deliver InAs NCs that need to be further optimized in terms of size distribution and optical properties, in order to meet the standard reached with tris-trimethylsilyl arsine. To this aim, in this work we show that the use of ZnCl2 as an additive in the synthesis of such NCs (based on amino-As and alane N,N-dimethylethylamine as the reducing agent) leads to two important achievements: i) helps to improve the size distribution of InAs NCs; ii) allows for the in-situ formation of bright emissive InAs@ZnSe core@shell NCs, with photoluminescence quantum yield ≥40%.[5] The results of this study open new perspectives for the production of efficient InAs-based NC systems with amino-As and, consenquently, for their exploitation in optoelectronic devices.
F.D.S. and H.B.J. acknowledge support by the European Research Council via the ERC-StG “NANOLED” (851794). L. M., F.D.S. and H.B.J. acknowledge support by the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 101024823 (INFLED). I.I. and L.M. acknowledge funding from the programme MiSE-ENEA under the Grant “Italian Energy Materials Acceleration Platform – IEMAP”.
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