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11 janvier 2017

Photochemical solution processing of films of metastable phases for flexible devices : the ß -Bi2O3 polymorph

The potential of UV-light for the photochemical synthesis and stabilization of non- equilibrium crystalline phases in thin films is demonstrated for the ß -Bi2O3 polymorph. The pure ß -Bi2O3 phase is thermodynamically stable at high temperature (450-667°C), which limits its applications in real devices. Here, a tailored UV-absorbing bismuth(III)-N- methyldiethanolamine complex is selected as an ideal precursor for this phase, in order to induce under UV-light the formation of a ß -Bi2O3 continuous network in the deposited layers and the further conversion into the ß -Bi2O3 polymorph at a temperature as low as 250°C. The stabilization of the ß -Bi2O3 phase is confirmed by the conductivity behavior of the films and a thorough characterization of their crystal structure. Besides, this processing method has allowed us for the first time the preparation of ß -Bi2O3 films on flexible plastic substrates, which opens new opportunities for using these materials in a new range of applications not available until now (e.g., flexible photocatalytic reactors, self-cleaning surfaces or wearable antimicrobial fabrics). Therefore, photochemical solution deposition (PCSD) demonstrates to be not only an efficient approach for the low temperature processing of oxide films, but also an excellent alternative for the stabilization of metastable phases.

Contact : Daniel.CHATEIGNER
Auteurs : D.Pérez-Mezcua, I.Bretos, R.Jiménez, J.Ricote, R.Jiménez-Rioboó, M.L.Calzada, C.Gonçalves da Silva, D.Chateigner, L. Fuentes, R. Sirera
Equipes : Matériaux Fonctionnels et de Structure (MFS)
Références :Scientific Reports 6, Article number : 39561 (2016)
DOI : 10.1038/srep39561
Collaborations : Instituto de Ciencia de Materiales de Madrid, Consejo Superior de Investigaciones Científicas. Madrid, Spain.
Centro de Investigación en Materiales Avanzados, Chihuahua, Mexico.
Departamento de Química, Facultad de Ciencias, Universidad de Navarra, Pamplona. Spain.