Patent ID: 7256146

Claim:
A method of forming a ceramic diffusion barrier layer comprising: preparing a solution of a polymeric preceramic precursor a, sacrificial moiety and a solvent, said sacrificial moiety, which produces porosity, selected from the group consisting of poly(styrenes), poly(esters), poly(methacylates), poly(acrylates), poly(glycols), poly(amides) and poly(norbornenes); applying said solution by a solvent based process onto a semiconducting substrate, where said polymeric preceramic precursor has a composition of Si v N w C x O y H z , where 0.1≦v≦0.8, 0≦w≦0.8, 0.05≦x≦0.8, 0≦y≦0.3, 0.05≦z≦0.8, and v+w+x+y÷z=1; and converting said polymeric preceramic precursor into a ceramic diffusion barrier layer, where said ceramic diffusion barrier prohibits metal diffusion.