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2D Colloidal Nanoplatelets based Optoelectronics

Published online by Cambridge University Press:  28 June 2016

Adrien Robin ,
Emmanuel Lhuillier  and
Benoit Dubertret
Adrien Robin*
Affiliation:
Nexdot, 10 rue Vauquelin, Paris, France Laboratoire de Physique et d’Etude des Matériaux, ESPCI ParisTech, PSL Research University, Sorbonne Université UPMC Université Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France.
Emmanuel Lhuillier
Affiliation:
Institut des Nanosciences de Paris, UPMC-CNRS UMR 7588, 4 place Jussieu, boîte courrier 840, 75252 Paris cedex 05, France.
Benoit Dubertret
Affiliation:
Laboratoire de Physique et d’Etude des Matériaux, ESPCI ParisTech, PSL Research University, Sorbonne Université UPMC Université Paris 06, CNRS, 10 rue Vauquelin 75005 Paris, France.
*
*To whom correspondence should be addressed: adrien.robin@espci.fr
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Abstract

Two-Dimensional materials open up great prospects in photodetector applications owing to their sharp optical properties and the ability to combine them in layered heterostructures. Among this new class of materials, colloidal nanoplatelets (NPL) made of cadmium chalcogenides readily combine the thickness control at the atomic level together with the large scale production and ease of processing of colloidal materials. As a strategy to overcome the limited mobility inherent to nanocrystal based devices, the photocarrier lifetime is increased by building an electrolyte-gated phototransistor to passivate the electron traps. NPL can also be coupled with a graphene transport layer collecting the photogenerated charges, thus bypassing the transport bottleneck. We show that the charge transfer is driven by the large exciton binding energy of the NPL, which can be engineered by heterostructured NPL. This allows us to control the magnitude and the direction of the charge transfer to graphene. Eventually, we use nanotrench electrodes to decrease the transit time of the carriers, suppress the influence of film defects and provide an electric field large enough to overcome the large exciton binding energy of NPL.

Keywords

photoconductivityoptoelectronicII-VI

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Type
Articles
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MRS Advances , Volume 1 , Issue 30: Nanotechnology , 2016 , pp. 2187 - 2192
Copyright
Copyright © Materials Research Society 2016 

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References

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