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Monday, 16 September 2019
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Raw materials & technologies, Technologies

Studying the crystallisation's annealing for the deposit of photovoltaic layers

Tuesday, 21 April 2015

A thesis describes the fabrication of thin films of Kesterite (CZTS) by nanoparticles printing followed by crystallisation annealing.

The thesis describes the fabrication of thin films of CZTS by nanoparticles printing followed by crystallisation annealing. Source: anna/Fotolia

The thesis describes the fabrication of thin films of CZTS by nanoparticles printing followed by crystallisation annealing. Source: anna/Fotolia

The research work by Thibaut Martini entitled "Study of the ink formulation based on Cu, Zn, Sn S precursors and of the crystallisation's annealing  for the non-vacuum deposit of photovoltaic layers” was prepared at the University of Grenoble, Laboratory of Pulp and Paper Science and Graphic Arts.

Replacing currently used absorbers

Kesterite (CZTS) is a semi-conductor only made of abundant elements. Its direct bangap between 1.0 and 1.5 eV makes it excellent candidate to replace the currently used absorbers in modules photovoltaic in thin coats. 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 particles chemical composition was studied and their purity was evaluated.

Presence of carbon inhibits growth

The behaviour of the colloidal dispersion is then characterised and three surface functionalisations based on dodecanethiol, dodecyl pyrrolidone and anions sulphides are presented. These stabilisations allow to make an ink-jet and spray ink adapted to the deposit on molybdenum. The printed and dried layers are then annealed in sulfur atmosphere. Annealing of at least 120 minutes is required. However, the growth of the layers is heterogeneous when printed with the nanoparticles stabilised by dodecanethiol and dodecyl pyrrolidone. The presence of carbon in layers, recognisable by spectroscopy Raman, inhibits the growth of the material. Only the thin layers printed by using purified and stabilised by anions sulphides nanoparticles allow the homogeneous growth of the material during annealing.

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