It depends. Have you access to sputtering, laser ablation or another vacuum based techniques? If not, do you have a chemical laboratory to do for example, Sol-Gel or Pechini-based deposition? These are not expensive and quite easy to do techniques. Another one is to buy TiO2 nanoparticles, for example P25 from Degussa (a usual provider) and make the photoelectrode combining the NPs with the Ti-isopropoxide loaded Pechini resin.

Many studies utilize Atomic Layer Deposition (ALD) to deposit TiO2 for solar cell applications. Here's a link to one of the examples where ALD TiO2 is used: http://pubs.acs.org/doi/abs/10.1021/la900113e

Hope this helps!