Etude de la formulation d'encre à base de précurseurs Cu, Zn, Sn, S et du recuit de cristallisation pour le dépot hors vide de couches photovoltaïques

Abstract : Kësterites or Cu2ZnSn(S,Se)4 (CZTS), are semi-conductors only made of abundant elements. Their direct bangap between 1.0 and 1.5 eV makes them excellent candidates for the replacement of the currently used thin film absorbers. This thesis describes the fabrication of thin films of Cu2ZnSnS4 by nanoparticles printing followed by crystallization annealing. Different hydrothermal synthesis of nanoparticles have been developed, some in continuous flow reactor, for a development on a larger scale. The influence of the types of precursors and synthesis conditions on the particals chemical composition purity was evaluated. The behavior of colloidal dispersion is then characterized and three surface functionalization based on dodecanthiol, dodecyl pyrrolidone and sulfide anions are presented. These stabilizations allow the manufacture of inks deposited by inkjet and spray on molybdenum. The printed and dried layers are then annealed in sulfur atmosphere. Annealing of at least 120 minutes are required. However, the growth of the layers is heterogeneous when printed with the nanoparticles stabilized by dodecanethiol and dodecyl pyrrolidone. The presence of high carbon content, prooved by Raman spectroscopy, inhibits the growth of the material. Only thin film printed using purified nanoparticles stabilized by sulfide anions allow homogeneous growth of the material during annealing.
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Thibaut Martini. Etude de la formulation d'encre à base de précurseurs Cu, Zn, Sn, S et du recuit de cristallisation pour le dépot hors vide de couches photovoltaïques. Autre. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAI063⟩. ⟨tel-01266968⟩

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