Thesis defence by Guislain HECTOR

“Chemical synthesis and characterisation of ZnO and Ga2O3 nanowires for the development of heterostructure intended for optoelectronic devices”



Keywords:


Zinc oxide, Gallium oxide, Chemical bath deposition, Optoelectronic, Heterostructures



cliquer pour voir la liste des membres du jury/clic here for the jury members
 

Abstract


The development of a new generation of optoelectronic devices has to consider the numerous ecological and energetical challenges in progress. The research on innovative materials and energy-saving chemical synthesis processes increases. ZnO nanowire arrays is very promising. Biocompatible, soft chemistry synthesis and composed of abundant elements, these arrays show attractive optical and electrical properties. Advantageous phenomena provide by this architecture are mainly controlled by nanowire’s morphology, optical and electrical properties. This PhD thesis first focuses on the possibility to simultaneously modify the morphological, optical and electrical properties of ZnO nanowire by adding indium nitrate during the chemical bath deposition.

In optoelectronic, ZnO nanowires arrays are mostly used with a core/shell hétérostructure configuration. Core/shell heterostructures devices integrate ZnO as a core and electron transporting material, and a semi-conducting shell as photon absorber material. The nanoscale thickness of the shell widens the semi-conductor choice and reduces the material consumption. This PhD thesis second focus on soft chemistry formation of Ga2O3 and ZnGa2O4, two innovative materials for UVC photo-detection, in order to integrate them as a shell. Core/shell hétérostructures show promising results for extremely thin absorber (ETA) solar cells based on ZnO/TiO2/Sb2S3. This PhD thesis also presents the optimisation of this specific ETA solar cell.
 

Membres du jury/ Jury members :

Dr.

M. BECHELANY

IEM, CNRS, ENSCM, Montpellier (France)

Rapporteur

Dr.

T. PAUPORTE

IRCP, CNRS, Chimie ParisTech, Paris (France)

Rapporteur

Prof.

A.KAMINSKI-CACHOPO

IMEP-LAHC, CNRS, Grenoble INP Minatec, Grenoble (France)

Examiner

Prof.

S. PAROLA

Laboratoire de chimie, CNRS, ENS de Lyon, Lyon (France)

Examiner

Dr.

V. CONSONNI

LMGP, CNRS, Grenoble INP Minatec, Grenoble (France)

Thesis Director

Dr.

E. APPERT

LMGP, CNRS, Grenoble INP Minatec, Grenoble (France)

Thesis Co-director


Date infos
2 pm - Amphi M 001, Building M, ground floor
Grenoble INP Phelma-Minatec
Location infos
Grenoble INP - Phelma
3 parvis Louis Néel - 38000 Grenoble
Accès : TRAM B arrêt Cité internationale
Free entrance - No registration