High photostability and quantum yield of nanoporous TiO2 thin film electrodes co-sensitized with capped sulfides

• DOI: 10.1039/b105796k
• Publication Date: 2002-07-26T09:14:06Z
• Authors: Shu-ming Yang; Chun-hui Huang; Jin Zhai; Zhong-sheng Wang; Lei Jiang
• Keywords: Nanoporous; Nanocrystalline material; Quantum yield; Chemical bath deposition; Quantum Efficiency; Deposition; Lead sulfide

Photoelectrochemical electrodes have been prepared by sequential deposition of quantum sized PbS, CdS and ZnS particles on TiO2 nanocrystalline films. Their photoelectrochemical properties studied in a two-electrode system which conforms more closely to practical conditions. The results show that the ternary sulfide PbS/CdS/ZnS co-sensitized electrode generates incident photon-to-current conversion efficiency (IPCE) as high nearly 100% under irradiation with 400 nm light; moreover its photostability is strongly improved, this first report so far. highest photoelectrical obtained for TiO2/PbS/CdS/ZnS electrode, about twice much TiO2/PbS.