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Nanoassemblies for photovoltaic applications

An easy process was developed to fabricate TiO2 nanowires sensitized with CdS and CdTeS quantum dots (QDs). CdS and CdTeS nanoparticles were grown in situ by a colloidal method. No pretreatment of the TiO2 nanowires was required prior to nanoparticle generation. Functionalization of CdS and CdTeS QDs was not needed to anchor these nanoparticles to TiO2 surface. The resulting nanostructure assembly and composition was confirmed by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The electronic structure of TiO2 nanowires was preserved as indicated by Raman spectroscopy. The sensitization of the TiO2 nanowires by the QDs was confirmed by photocurrent measurements. This study allows the generation of strongly anchored CdS and CdTeS QDs on TiO2 nanowires surface without the introduction of a linker molecule which presence decreases the electron injection efficiency.