Dr Maytham, this link could also be of help: https://scholar.google.com/scholar?q=metal+oxide+photoanodes+for+solar+hydrogen+production&hl=en&as_sdt=0&as_vis=1&oi=scholart&sa=X&ved=0ahUKEwi-7beu6qfaAhWMJcAKHeEBBJEQgQMIBzAA
I think this depend on the all layers in your solar cell device, because you may get on the suitable band gap value, but other parameters isn't, such as mismatch as a structure properties, or the technique that used to prepare this layer.However, all metal oxides has a suitable band gap for solar cell applications because have high energy gap which called (Window layer).