fulltext.study @t Gmail

Fabrication and characterization of thin Nb2O5 blocking layers for ionic liquid-based dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
28187 44063 2007 8 PDF Available
Title
Fabrication and characterization of thin Nb2O5 blocking layers for ionic liquid-based dye-sensitized solar cells
Abstract

The preparation of a novel Nb2O5 blocking layer deposited between fluorine-doped tin oxide (FTO) and nanocrystalline TiO2 layer and its application for hydrophobic dye Z-907 sensitized ionic liquid-based solar cells have been studied. The Nb2O5 blocking layer prepared by spray pyrolysis method on FTO has been characterized by scanning electron microscope (SEM) equipped with energy dispersion X-ray analysis (EDX), transmit electron microscope (TEM), electrochemical impedance spectroscopy (EIS) and X-ray photoelectron spectroscopy (XPS). Thin Nb2O5 films work as a potential blocking layer between FTO and nanocrystalline TiO2 layer in ionic liquid electrolyte cells, improving Voc and finally giving a better conversion efficiency of dye-sensitized TiO2 solar cells. Impedance spectroscopy indicates that the blocking layer can increase shunt resistance especially related with the charge transport at FTO–TiO2/dye/ionic liquid electrolyte and decrease the series resistance to some extent by constructing the potential barrier. Analysis of diffusion coefficient and lifetime of electrons in the cells confirms that they compensate each other when the blocking layer was introduced, leading to a little influence on the diffusion length (L). The remarkable improvements of Voc and fill factor for the DSCs suggest that the thin Nb2O5 is an effective blocking layer at FTO and TiO2 interface, contributing to unidirectional transport of electrons in the ionic liquid-based dye-sensitized nano-TiO2 solar cells.

Keywords
Nb2O5; Blocking layer; Dye-sensitized solar cell; Impedance spectroscopy
First Page Preview
Fabrication and characterization of thin Nb2O5 blocking layers for ionic liquid-based dye-sensitized solar cells
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 188, Issue 1, 30 April 2007, Pages 120–127
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us