Proceedings of nanoGe Fall Meeting 2021 (NFM21)
DOI: https://doi.org/10.29363/nanoge.nfm.2021.057
Publication date: 23rd September 2021
Colloidal InAs quantum dots are ideal candidates for QD based technologies in the near infrared region of the electromagnetic spectrum. Despite significant effort, scalable synthesis methods that produce large InAs nanocrystals absorbing beyond 1400 nm are scarce, rely on harsh precursors, require long reaction times and typically yield poorly luminescing QDs. In this work we overcome these challenges and report a 1-step colloidal synthesis of tetrahedrally shaped InAs QDs with tunable edge lengths between 4.5 and 9.5nm, relative size dispersions of 10% and excitonic absorption features with maxima as far as 1550 nm. With tris(diethylamino)phosphine as a mild reducing agent to synthesize InAs from InCl3 and tris(trimethylamino)arsine, we identify that the growth of InAs is triggered only at high temperatures. As a consequence, dilution and a steep temperature ramp can be used to suppress nucleation and promote growth, respectively. With these simple strategies, different sizes of InAs QDs can be synthesized in a reaction time of just 1 hour. Furthermore, after ligand exchange reactions with alkanethiols or zinc oleate the already luminescent InAs core is passivated better to yield PLQYs of 9 and 52% for the respective ligands. This work demonstrates the value of identifying and optimizing fundamental nanocrystal synthesis conditions, which culminates here in a meticulous control over InAs QDs with application ready optical properties.
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