Another highly significant feature that can be observed for the CdS/TiO 2 nanotube layers is the red shift of the IPCE values with increasing thickness of the CdS/TiO 2 nanotube layers, as shown in Fig. 5b .
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A 1D conical nanotubular TiO<sub>2</sub>/CdS heterostructure with superior photon-to-electron conversion.
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