US Patent 11768435 Bottom-up conformal coating and photopatterning on PAG-immobilized surfaces

Materials and methods to immobilize photoacid generators on semiconducting substrates are provided. PAG-containing monomers are copolymerized with monomers to allow the polymer to bind to a surface, and optionally copolymerized with monomers to enhance solubility to generate PAG-containing polymers. The PAG-containing monomers can be coated onto a surface, where the immobilized PAGs can then be used to pattern materials coated on top of the immobilized PAGs, allowing direct patterning without the use of a photoresist, thereby reducing process steps and cost. The disclosed materials and processes can be used to produce conformal coatings of controlled thicknesses.