Effect of Thermal Stresses Formed during Air Annealing of Amorphous Lanthanum Cuprate Thin Films Deposited on Silicon Substrate

Nolwenn Tranvouez (1) , Philippe Steyer (2) , Annie Malchère (2) , Pascal Boulet (1) , Fabien Capon (1) , Jean-Philippe Bauer (1) , Jean-François Pierson

1 IJL - Institut Jean Lamour
2 MATEIS - Matériaux, ingénierie et science [Villeurbanne]

Amorphous thin films of La-Cu-O deposited by magnetron sputtering have been annealed at different temperatures and in situ analyzed by X-ray diffraction. These experiments were useful to determine the crystallization temperature and to follow the crystallization process of the film. The in situ annealing X-ray diffraction analyses have been also used to determine the thermal expansion coefficient of La2CuO4 thin film. The estimated value is close to that obtained for a commercial powder. The thermal expansion coefficient value with additional environmental scanning electron microscopy observations explains the delamination origin that occurs during the annealing before the crystallization step. The buckling and delamination of the film observed is caused by the thermal expansion coefficient mismatch of the film and the substrate. During the heating step, the mismatch generates compressive stress at the film/substrate interface, causing the film to lift off and crack in the typical way.

Mots clés: crystallization; thin films; La2CuO4; thermo-mechanical properties

Domaines: Matériaux; Matériaux

Nolwenn Tranvouez, Philippe Steyer, Annie Malchère, Pascal Boulet, Fabien Capon, et al.. Effect of Thermal Stresses Formed during Air Annealing of Amorphous Lanthanum Cuprate Thin Films Deposited on Silicon Substrate. Coatings, 2020, 10 (7), pp.613. ⟨10.3390/coatings10070613⟩. ⟨hal-02945236⟩