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Photovoltaics: oxide perovskites on 2D nanosheets, a new alternative for transparent conductors
Photovoltaics: oxide perovskites on 2D nanosheets, a new alternative for transparent conductors - EDDL

To extract the electric charges produced in the photovoltaic cells, an electrode transparent to visible light is used so that the latter can reach the photoactive materials. To replace indium tin oxide (ITO), an electrode material currently used but too expensive, it was proposed to replace it by the original way of transparent and conducting perovskite oxides based on vanadium deposited on 2D materials. This heterostructure deposited on glass has performance comparable to that of ITO.

TV screens, tablets, cell phones, photovoltaic cells, all of them work with conducting materials that transport electrical charges. In addition, for these applications, they must be transparent to visible light, which considerably limits the number of potential conducting and transparent candidates.

Indium tin oxide (ITO), currently widely used to play this role, involves a large consumption of indium on an industrial scale, an expensive chemical element because it is relatively rare in the earth's crust. In this cooperative work, the researchers of CRISMAT and CIMAP (CNRS/Normandie Université/ENSICAEN/UNICAEN), ISCR (CNRS/Université de Rennes), GEMaC and ILV (CNRS/Université de Versailles Saint-Quentin-en-Yvelines – Université Paris-Saclay), P’ (CNRS/ Université de Poitiers-ENSMA SP2MI), thus propose to replace it by transparent conducting perovskite oxides based on vanadium, a much more abundant element. However, these materials must be crystallized in order to exhibit their transport and transparency properties, which is difficult to obtain on glass.

For this, they selected transparent oxide nanosheets, which will cover, by simple soaking in a solution, the glass supports, at room temperature, that is to say under mild conditions. These 2D materials, which have the same in plane crystalline constants to those of the perovskites will thus be used for the germination of vanadates at relatively low temperature, which makes it possible to obtain a homogeneous crystalline deposit, of controlled thickness, transparent to visible light, exhibiting electrical conduction properties and optical transparency comparable to those of ITO.

Result published in the journal Advanced Functional Materials.

Reference

Alexis Boileau,Simon Hurand,Florent Baudouin,Ulrike Lüders,Marie Dallocchio,Bruno Bérini,Aimane Cheikh,Adrian David,Fabien Paumier,Thierry Girardeau,Philippe Marie,Christophe Labbé,Julien Cardin,Damien Aureau,Mathieu Frégnaux,Maryline Guilloux-Viry,Wilfrid Prellier,Yves Dumont,Valérie Demange & Arnaud Fouchet
Highly Transparent and Conductive Indium-Free Vanadates Crystallized at Reduced Temperature on Glass Using a 2D Transparent Nanosheet Seed Layer
Advanced Functional Materials 2021, https://doi.org/10.1002/adfm.202108047

Contact

Valérie Demange, Univ Rennes, ISCR-CNRS UMR 6226, F-35000 Rennes, France
valerie [dot] demangeatuniv-rennes1 [dot] fr

 

Published October 15, 2021