27 January 2017 Intraband transition in self-doped narrow band gap colloidal quantum dots
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In this article we discuss the infrared properties of self-doped nanocrystals and in particular the case of HgSe. HgSe colloidal quantum dots have recently been reported for their tunable optical features all over the mid infrared from 3 to 20 μm. Their optical absorption is a combination of interband absorption at high energy and intraband absorption at low energy. The latter results from the self-doped character of HgSe. The origin of this self-doping is also discussed. We demonstrated that the doping results from the combination of the narrow band gap and high work function of HgSe, which leads to a reduction of the CQD by the water in the environment. In addition, we demonstrated that the doping density can be tuned over an order of magnitude thanks to the control of the capping ligands.
Conference Presentation
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Bertille Martinez, Bertille Martinez, Clément Livache, Clément Livache, Adrien Robin, Adrien Robin, Herve Cruguel, Herve Cruguel, Sebastien Royer, Sebastien Royer, Xiang Zhen Xu, Xiang Zhen Xu, Herve Aubin, Herve Aubin, Sandrine Ithurria, Sandrine Ithurria, Emmanuel Lhuillier, Emmanuel Lhuillier, } "Intraband transition in self-doped narrow band gap colloidal quantum dots", Proc. SPIE 10111, Quantum Sensing and Nano Electronics and Photonics XIV, 101112S (27 January 2017); doi: 10.1117/12.2250155; https://doi.org/10.1117/12.2250155

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