Structural Effects on the Incident Photon-to-Current Conversion Efficiency of Zn Porphyrin Dyes on the Low-Index Planes of TiO.

The structural effects of substrates on the incident photon-to-current conversion efficiency (IPCE) of Zn porphyrin (ZnP) dyes (ZnP-ref, YD2, and ZnPBAT) have been studied on well-defined single-crystal surfaces of rutile TiO (TiO(111), TiO(100), and TiO(110)). IPCE of ZnP-ref depends on the structure of the substrates remarkably: TiO(100) < TiO(110) < TiO(111). IPCE of ZnP-ref/TiO(111) is 13 times as high as that of ZnP-ref/TiO(100) at 570 nm.