Scanning electron microscopy 13 Thin films 10 Electronic equipment 9 Substrates 9 Thermoelectric equipment 9 Field emission microscopes 8 Field emission scanning electron microscopy 8 Sol-gels 8 Zinc oxide 8 Electric conductivity 7 Titanium dioxide 7 Current-voltage measurements 6 Electrical conductivity 6 Optical properties 6 Sol-gel process 6 Morphology 5 Sol-gel spin coating 5 Temperature 5 X ray diffraction 5 Annealing temperatures 4 Capacitance 4 Coatings 4 Dielectric materials 4 Efficiency 4 Electric discharges 4 Electrical characteristic 4 Electrical conductivity measurements 4 Electrodes 4 Graphene 4 II-VI semiconductors 4