Laser heating experiments on multilayered (SI)n strips and possible improvements of TES-based bolometers

Structure and properties of the YBa2Cu3O7−x/LaAlO3 superlattices

“…YBCO/SrTiO 3 ͑STO͒ superlattices were realized in order to realize microbolometers where the role of the interfaces was to induce the thermal decoupling between the active layer at the top of the device and the substrate. 6 The thermal decoupling is performed by the phonon scattering at the interfaces. Strontium titanate appears as a good candidate because of its insulating properties and the merging lattice parameter but the deposition of YBCO/STO superlattices revealed a low diffusion of oxygen through the STO layers leading to a poor crystallized system.…”

“…Moreover, in the case of YBCO/STO multilayered structures, Y 2 O 3 inclusions appear which nucleate at the STO layers. 6,7 However, LAO was not selected as a substrate for deposition because of its rhombohedral structure and the presence of a high density of twins at room temperature. The crystallographic relationship, the presence of defects, and the roughness of the interfaces are important parameters for the quality of the film.…”