Synthèse et caractérisation de nanoplaquettes semi-conductrices : contrôle des dimensions, de la forme et de la composition

Abstract : This work supported by Solarwell aims at developing nanoplatelets syntheses. These anisotropic structures might facilitate the integration of nanocrystals in devices using their outstanding optoelectronic properties such as light-emitting diodes, solar cells or transistors. These bidimensionnal semi-conducting nanocrystals have a one dimensional quantum confinement and are atomically flat. The first objective of this work is to extend laterally the nanoplatelets in order to obtain micrometer scale thin films by colloidal synthesis. For this purpose, a strategy for lateral extension by continuously injecting precursors as well as an optimization work on synthesis parameters were realized. It allowed developing a robust synthesis to obtain nano-scrolls hundreds of nanometers long. The nano-scrolls obtained are characterized by absorption spectroscopy and transmission electronic microscopy. They are unrolled by a technique used to grow shells on core nanoplatelets. This procedure leads to flat nanosheets hundreds of nanometers wide and one nanometer thick. In order to widen the accessible wavelength domain, a cation exchange method has been applied to cadmium chalcogenides nanoplatelets. Nanoplatelets absorbing in the UV part (zinc chalcogenide) and infrared part (lead chalcogenide) of the spectrum have been realized. This technique allows extending the 2D heterostructures to new materials.
Document type :
Theses
Complete list of metadatas

https://pastel.archives-ouvertes.fr/pastel-00943691
Contributor : Cécile Bouet <>
Submitted on : Saturday, February 8, 2014 - 2:06:46 PM
Last modification on : Thursday, July 4, 2019 - 11:00:07 AM
Long-term archiving on : Sunday, April 9, 2017 - 10:06:19 AM

Identifiers

  • HAL Id : pastel-00943691, version 1

Citation

Cécile Bouet. Synthèse et caractérisation de nanoplaquettes semi-conductrices : contrôle des dimensions, de la forme et de la composition. Matériaux. Université Pierre et Marie Curie - Paris VI, 2013. Français. ⟨pastel-00943691⟩

Share

Metrics

Record views

651

Files downloads

1559