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Synthèse et propriétés de monocristaux, de poudres, films minces ou hétérostructures

Etudes à l'interface avec la matière biologique

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Publication de Shanting Zhang 2017

Publié le 28 juillet 2017
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Communiqué du 8 septembre 2017 au 13 septembre 2017

Le papier "Polymorphism of the Blocking TiO2 Layer Deposited on F:SnO2 (FTO) and Its Influence on the Interfacial Energetic Alignment" a été publié dans J. Phys. Chem. C

Ici  vous trouverez le papier de Shan-Ting Zhang

"As widely employed in dye-sensitized, perovskite, and quantum-dot solar cells, the interface between F-doped SnO2 (FTO) and blocking TiO2 (b-TiO2) is essential in understanding the working principles of these types of solar cells. In this work, we have deposited b-TiO2 layers using a simple sol-gel method. While the b-TiO2 layers deposited on Si (100) wafers form pure anatase polymorph, we have found that the rutile structure of the FTO substrates consistently induces the b-TiO2 layers to crystallize into mixed anatase and rutile polymorphs - the same is observed on rutile RuO2 substrates. This indicates that the rutile structural similarity favors the formation of rutile polymorph in b-TiO2 layers; due to the coexistence of both anatase and rutile polymorphs, the interface of FTO/b-TiO2 is essentially inhomogeneous. We also show that the amount of rutile polymorph present in the b-TiO2 layer is a function of layer thickness, with rutile polymorph dominating in thin b-TiO2 layers. As a result, the energetic alignment at the FTO/b-TiO2 interface in general still favors the charge transport. This is confirmed by directly probing an ultra-thin (<10 nm) b-TiO2 layer using X-ray photoelectron spectroscopy (XPS). We emphasize that the rutile structure of FTO substrate plays a significant role in determining the polymorph of successively deposited b-TiO2 layer, which in turn affects the energetic alignment with FTO electrodes and mesoporous nanocrystalline TiO2, and ultimately the performance of solar devices."


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mise à jour le 16 octobre 2019

  • Tutelle CNRS
  • Tutelle Grenoble INP
Université Grenoble Alpes