- bind
- binding
- collaboration
- conversion
- convert
- coordination
- copper
- copper_based
- costly
- counterparts
- currently
- dioxide
- direct
- discovery
- dye
- dyes
- efficiencies
- efficiency
- efficient
- electrical
- enhancing
- established
- expensive
- family
- inexpensive
- international
- internationally
- junction
- lead
- material
- materials
- practical
- protocols
- ruthenium
- semiconductor
- solar
- somewhat
- strength
- strongly
- sun
- sunlight
- surface
- titanium
- utilise
