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Title: The structure and photovoltaic properties of double-shell TiO{sub 2}/ZnSe/CdSe nanocable arrays synthesized by using TiO{sub 2}/ZnO nanocables template

Highlights: • The ZnSe/CdSe/TiO{sub 2} nanocable arrays were synthesized. • The TiO{sub 2}/ZnSe/CdSe double shell electrode shown better photovoltaic performance. • A stepwise band alignment structure was constructed in the TiO{sub 2}/ZnSe/CdSe electrode. • A highest power conversion efficiency of 1.33% has been obtained. - Abstract: A simple method was reported for the first time to synthesize ZnSe/CdSe co-sensitized TiO{sub 2} nanorod arrays. TiO{sub 2}/ZnO nanocables were firstly prepared by magnetic sputtering ZnO films on TiO{sub 2} nanorod arrays, and the TiO{sub 2}/ZnSe nanocables were synthesized by selenization of TiO{sub 2}/ZnO nanocables with Se{sup 2−} ions. Finally, CdSe quantum dots (QDs) were electrodeposited on the TiO{sub 2}/ZnSe nanocables forming a TiO{sub 2}/ZnSe/CdSe tri-layer configuration. It is found that the tri-layer photoelectrode has a complementary effect in the light absorption, while the ZnSe shell acts as a blocking layer to retarding the interfacial recombination. Furthermore, a stepwise band alignment structure was constructed in the TiO{sub 2}/ZnSe/CdSe electrode, which greatly speeds up the transfer rate of photoexcited electrons from CdSe to TiO{sub 2}. Thus, the TiO{sub 2}/ZnSe/CdSe electrode presented better photovoltaic performance than the single shell. Through optimization the thickness of ZnSe layer in the TiO{sub 2}/ZnSe/CdSe photoelectrode, a highest power conversionmore » efficiency of 1.33% was obtained.« less
Authors:
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Publication Date:
OSTI Identifier:
22420624
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 59; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM SELENIDES; DEPLETION LAYER; ELECTROCHEMISTRY; ELECTRODEPOSITION; FILMS; NANOSTRUCTURES; PHOTOELECTRON SPECTROSCOPY; PHOTOVOLTAIC EFFECT; QUANTUM DOTS; RECOMBINATION; SPUTTERING; TITANIUM OXIDES; ZINC OXIDES; ZINC SELENIDES