I want to deposit a thin layer of SnO2 on a glass substrate by doctor-blade technique, just like we do for standard dye-sensitized solar cells. I couldn´t find any commercial SnO2 paste like TiO2. Does anyone know how to prepare a paste from commercial SnO2 nanoparticles (between 10-40nm aprox.)? Could you recommend any supplier for the nanoparticles?