Fig. 5. (a and b) Incident photon-to-current efficiency and (c and d) transient photocurrent at 360 nm and at 470 nm, respectively, recorded for blank and CdS/TiO2 nanotube layers of different thicknesses. Arrows indicate light ON (↑) and light OFF (↓). (e) Cycling performance of photocurrents transients, measured at 470 nm for 60 μm thick CdS coated TiO2 nanotube layers (21 cycles).
