Device for diffusing a precursor with a container having at least one porous element allowing the generation of an aerosol towards a growth surface

A diffusion device of a precursor configured to diffuse a growth precursor towards an external growth surface comprised on an external growth member, the diffusion device comprising a container internally delimiting at least one receiving enclosure, the container being at least partially constituted by at least one porous element, the porous element internally delimiting an inner surface, the inner surface at least partially delimiting the at least one receiving enclosure, the porous element externally delimiting a diffusion surface intended to face towards the external growth surface, the at least one receiving enclosure being configured to contain a precursor fluid comprising the growth precursor,

• the diffusion device comprising the precursor fluid contained in the receiving enclosure,
• the porous element having a porosity configured on the one hand to allow the precursor fluid to pass through a thickness of the porous element counted between the inner surface and the diffusion surface as long as a pressure of the precursor fluid contained in the receiving enclosure is strictly higher than a threshold pressure, on the other hand to prevent the precursor fluid from passing through the thickness of the porous element when the pressure of the precursor fluid contained in the receiving enclosure is lower than the threshold pressure, the threshold pressure being strictly higher than an external pressure prevailing outside the container;
• the porous element being configured so that the precursor fluid which passes through the thickness of the porous element generates, from the diffusion surface, an aerosol by fragmentation of the precursor fluid,
• the aerosol being formed of droplets of the precursor fluid and contained between the diffusion surface and the external growth surface.