Film thickness Thin films 8 Film-thickness 5 Coatings 4 Sol-gels 4 Additives 3 Sol-gel process 3 Efficiency 2 Electrical conductivity 2 Electrolytes 2 Electronic equipment 2 Light absorption 2 Liquid films 2 Morphology 2 Optical properties 2 Sol-gel spin coating 2 Speed 2 Spin coating 2 Surface morphology 2 Thermoelectric equipment 2 Thickness measurement 2 Thin-films 2 'current 1 Absorption spectroscopy 1 Activated carbon 1 Active material 1 Air-gaps 1 Amplitude 1 Annealing temperatures 1 Area-specific resistances 1