A method for producing at least one porous layer on a substrate, whereby a suspension, which contains particles from a layer-forming material or molecular precursors of the layer-forming material, as well as at least one organic component, is applied to the substrate, the precursors of the layer-forming material are subsequently reacted to produce the layer-forming material following application to the substrate, in a next step, the particles from the layer-forming material are sintered, and the at least one organic component is subsequently removed. Also, a field-effect transistor having at least one gate electrode, the gate electrode having an electrically conductive, porous coating which was applied in accordance with the method.