Alumina and Hafnia ALD Layers for a Niobium-Doped Titanium Oxide Photoanode

Figure 2

SEM images of the surface of (a) uncoated Nb : TiO₂ films, for Nb : TiO₂ layer treated with 10 cycle of ALD of (b) alumina and (c) hafnia. The index of (b) showed the EDX spectrum of the layer.

(a)

(b)

(c)