Synthesis of CdS/TiO

Vincenzo Resta, Anna M. Laera, Emanuela Piscopiello, Laura Capodieci, Maria C. Ferrara, Leander Tapfer

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Highly porous nanocrystalline films of TiO2sensitized with semiconductor nanocrystals (NCs) are very promising for photovoltaic applications, NCs being more versatile and efficient than organic dyes as sensitizer. In this framework, the visible light absorption of TiO2 can be improved by the superposition of CdS NC absorption band, that is tunable between 2.5 and 5.2 eV. Here, we report on a novel in situ approach for the synthesis of CdS NCs in mesoporous sol-gel TiO2anatase films by using as starting reagent for CdS, [Cd(SBz)2]MI, where MI represents 1-methylimidazole. The precursor has been adsorbed into the TiO2pores and then decomposed at 480 °C, the procedure being studied for TiO2films with different porosity. The matrices have been investigated by atomic force microscopy. X-ray diffraction measurements on TiO2matrix and on the corresponding CdS/TiO2nanocomposite material revealed a variation of the NCs size of both TiO2and CdS as a function of the matrix porosity. The optical properties of the TiO2 and CdS/TiO2have been studied by UV-Vis transmission spectroscopy. CdS/TiO2 nanocomposites, having higher absorption efficiency with respect to TiO2, are suitable as building blocks for 3rd generation solar cell design.
Original languageEnglish
Pages (from-to)1631 - 1635
Number of pages5
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume207
Issue number7
DOIs
Publication statusPublished - Jul 2010

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering
  • Materials Chemistry

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