Coating techniques 1 Coatings 1 Deposition technique 1 Doctor blade method Doctor blade technique 1 Efficiency 1 Electrical conductivity 1 Environmental-friendly 1 Film thickness 1 Hybrid solar cells 1 Improving efficiency 1 Light absorption 1 Morphology 1 Oxide minerals 1 Power conversion efficiencies 1 Semiconductor materials 1 Solar cells 1 Solar power generation 1 Titanium dioxide 1