Method for preparing a single-domain thin layer made of lithium-containing ferroelectric material

A method for preparing a single-domain thin layer of lithium-containing ferroelectric material, the method comprising:

• providing a first single-domain layer of lithium-containing ferroelectric material, the first single-domain layer being bonded to a carrier, the first single-domain layer having a lithium-rich surface thickness;
• and
• finishing the first single-domain layer, this finishing comprising heat treatment of a free side of the first single-domain layer, followed by a step of thinning the first single-domain layer to form the single-domain thin layer;
• wherein the preparation method comprises, prior to heat treatment:
• a first step of wet cleaning of the free side of the first single-domain layer, the wet cleaning step being able to remove the lithium-rich surface layer;
• and
• a second step of preparing the first single-domain layer to eliminate, prevent, or limit an appearance of lithium-rich and hydrogen-rich dendrites liable to nucleate on the free side of the first single-domain layer when the first single-domain layer is devoid of the lithium-rich surface layer.