Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
My talk will review the progress of our group about the growth of 2D nanoplatelets (NPLs) of metal chalcogenides. The story will start with the synthesis of cadmium chalcogenides (CdSe, CdS and CdTe) NPLs and discuss both their growth process and specific optical features.1 In particular the NPLs present the narrowest optical features obtained, so far, for colloidal nanoparticles.
I will then move to the growth of heterostructures. As fragile objects, the growth of core/shell nanoparticules has required the development of specific low temperature method such as the colloidal Atomic Layer Deposition method.2 I will also discuss the integration of the CdSe/CdS NPLs into devices and how their 2D aspects affect their optoelectronic properties in particular through their large excitonic binding energy.3,4
2D shape also allows the growth of specific heterostructures with core/crown geometry which leads to a new degree of freedom for the design of the excitonic transition.5,6
Finally I will discuss the growth of mercury chalcogenides NPLs using a cation exchange approach. Compared to spherical quantum dots emitting in the same range of wavelength, the HgTe NPLs present a similar PL efficiency (10%) but with a far narrower emission (60meV for an emission at 880nm).7 To finish I will mention how the transport and phototransport properties of the material are strongly affected by a change of the capping ligands.
Reference
(1) Ithurria, S.; Tessier, M. D.; Mahler, B.; Lobo, R. P. S. M.; Dubertret, B.; Efros, A. L., Nature Materials, 2011, 10, 936–941.
(2) Ithurria, S.; Talapin, D. V., J. Am. Chem. Soc. 2012, 134, 18585–18590.
(3) Lhuillier, E.; Dayen, J. F.; Thomas, D. O.; Robin, A.; Doudin, B.; Dubertret, B., Nano Lett. 2015, 15, 1736–1742.
(4) Lhuillier, E.; Robin, A.; Ithurria, S.; Aubin, H.; Dubertret, B., Nano Lett. 2014, 14, 2715–2719.
(5) Tessier, M. D.; Spinicelli, P.; Dupont, D.; Patriarche, G.; Ithurria, S.; Dubertret, B., Nano Lett. 2014, 14, 207–213.
(6) Pedetti, S.; Ithurria, S.; Heuclin, H.; Patriarche, G.; Dubertret, B., J. Am. Chem. Soc. 2014, 136, 16430–16438.
(7) Izquierdo, E.; Robin, A.; Keuleyan, S.; Lequeux, N.; Lhuillier, E.; Ithurria, S. , J. Am. Chem. Soc. 2016, 138, 10496–10501.
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