Is nano-crystalline TiO2 necessary for DSSC

[Jessek]

For a science fair project, I am going to test  some various organic dye sources and see how that affects the efficiency of dye sensitized solar cells. I was curious if I needed a specific type or titanium dioxide or if normal TiO2 would work if I friended it in a mortar and pestle. Any information would be appericiated, thanks.

[Mess.42]

Assuming you’re talking about anatase structure, it works better than rutile but rutile should still work. I’m not sure if the results will be proportional though.