Pore-filled dielectric materials for semiconductor structure fabrication, and methods of fabricating pore-filled dielectric materials for semiconductor structure fabrication, are described. In an example, a method of fabricating a pore-filled dielectric material for semiconductor structure fabrication includes forming a trench in a material layer. The method also includes filling the trench with a porous dielectric material using a spin-on deposition process. The method also includes filling pores of the porous dielectric material with a metal-containing material using an atomic layer deposition (ALD) process.