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Electrochemical impedance and X-ray photoelectron spectroscopic analysis of dye-sensitized liquid electrolyte based SnO2/ZnO solar cell

Paper ID Volume ID Publish Year Pages File Format Full-Text
27793 44043 2010 10 PDF Available
Title
Electrochemical impedance and X-ray photoelectron spectroscopic analysis of dye-sensitized liquid electrolyte based SnO2/ZnO solar cell
Abstract

A dye-sensitized solar cell based on interconnected SnO2 nanoparticle matrix covered with a thin outer shell of ZnO, N719 dye, I−/I3− in acetonitrile liquid electrolyte system and lightly platinized FTO counter electrode shows significantly enhanced performance when compared to similar cells made with either pristine SnO2 or pristine ZnO interconnected nanoparticles. Attempts have been made to investigate the reasons for such an improvement using the information obtained from X-ray photoelectron spectroscopy (XPS) and the electrochemical impedance spectroscopy (EIS). The XPS results reveal that the interconnected nanoparticluar SnO2 matrix surfaces are fully covered by a ∼1 nm thick outer shell of a ZnO layer. EIS results disfavour the idea of direct injection of electrons from the excited dye molecules across the thin outer shell of ZnO into the conduction band of SnO2 but supports the fact that electrons are first injected to the CB of ZnO and subsequently to the CB of SnO2 particles both involving trapping and detrapping at each stage. The electron transport along the interconnected SnO2 nanoparticles also involves anomalous diffusion characterized by a straight line of inclination greater than 45° in the complex impedance plot. This anomalous diffusion is attributed to the trap mediated electron transport.

Keywords
Dye-sensitized solar cell; SnO2/ZnO; Electrochemical impedance spectroscopy; Electron traps
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Electrochemical impedance and X-ray photoelectron spectroscopic analysis of dye-sensitized liquid electrolyte based SnO2/ZnO solar cell
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 215, Issue 1, 5 September 2010, Pages 1–10
Authors
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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