Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.164
Publication date: 6th July 2018
Pushing nanocrystals optical features toward the infrared range can be a material challenge. Two strategies can be explored. Either the use of narrow band gap materials for the design of narrow interband transitions, either the use of doped semiconductor presenting intraband transition in the mid infrared [1]. Here, I will focus on this second strategy while using mercury chalcogenides compounds as optically active material.
At first, I will present our strategy to explore the synthesis of HgSe [2] and HgTe [3] self-doped nanocrystals which has been used to tune absorption up to the THz range, typically from 3 µm to 60 µm for peak absorption and up to 200µm for cut-off wavelength.
Because the doping plays a key role in this material, I will discuss the origin of self-doping and how surface chemistry can be used to tune accurately its magnitude [4].
In the last part of the talk, I will present some results relative to the use of this intraband transition for mid IR photodetection. I will show how an heterostructure made of HgSe and HgTe can be used to uncouple the problem of absorption and charge transport [5]. This paves the way for the design of even more complex colloidal heterostructure on the model of quantum cascade system develloped for III-V material.
[1] Emergence of intraband transitions in colloidal nanocrystals, A. Jagtap, C. Livache, B. Martinez, J. Qu, Audrey Chu, C. Gréboval, N. Goubet, E. Lhuillier, Opt. Mater. Express 8(5), 1174-1183 (2018)
[2] Infrared photo-detection based on colloidal quantum-dot films with high mobility and optical absorption up to the THz, E. Lhuillier, M. Scarafagio, P. Hease, B. Nadal, H. Aubin, X. Z. Xu, N. Lequeux, G. Patriache, S. Ithurria, B. Dubertret, Nano Lett 16, 1282 (2016)
[3] Terahertz HgTe nanocrystals: beyond confinement, N. Goubet, A. Jagtap, C. Livache, B. Martinez, H. Portales, X. Zhen Xu, R.P.S.M. Lobo, B. Dubertret, E. Lhuillier, J. Am. Chem. Soc. 140, 5053 (2018).
[4] Surface Control of Doping in self-doped Nanocrystals, A. Robin, C. Livache, S. Ithurria, E. Lacaze, B. Dubertret, E. Lhuillier, ACS Appl. Mat. Interface 8, 27122−27128 (2016).
[5] Wavefunction engineering in HgSe/HgTe colloidal heterostructures to enhance mid infrared photoconductive properties, N. Goubet, C. Livache, B. Martinez, X. Z. Xu, S. Ithurria, S. Royer, H. Cruguel, G. Patriarche, A. Ouerghi, M. Silly, B. Dubertret, E. Lhuillier, Nano Lett 18 (2018)
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