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Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)

Paper ID Volume ID Publish Year Pages File Format Full-Text
27347 44017 2011 7 PDF Available
Title
Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)
Abstract

Quantum Dot Sensitized Solar Cells are emerging as a new type of photovoltaic device. In this context, ZnO nanoporous films have been sensitized to the visible by depositing CdSe quantum dots (QDs) by the so-called Successive Ionic Layer Adsorption and Reaction (SILAR) method. Experiments using a ZnO(0 0 0 1) single crystal reveal that the surface is nearly fully covered with CdSe QDs even after only 2 SILAR cycles. In agreement, Transmission Electron Microscopy images of the nanoporous electrodes show the initial generation of small nanoparticles, which finally leads to the formation of large aggregates. In the absence of an electron scavenger in solution, the CdSe-sensitized ZnO electrodes show an Incident Photon to Current Efficiency as high as 70%, similar to previously reported values for TiO2 electrodes. In addition, zinc oxide photoanodes prepared by SILAR are also more efficient than those sensitized with colloidal CdSe QDs attached to the oxide through molecular linkers. The prospects of preparing complete quantum dot solar cells based on ZnO as electron conducting phase are briefly discussed.

► Nanoporous ZnO electrodes can be efficiently sensitized to the visible with CdSe quantum dots. ► An optimized SILAR method has been used. ► The CdSe-sensitized ZnO electrodes show an IPCE as high as 70%, similar to previously reported values for TiO2 electrodes.

Keywords
ZnO electrodes; CdSe deposition; Quantum dots; IPCE; Photoanode; Solar cells
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Efficient sensitization of ZnO nanoporous films with CdSe QDs grown by Successive Ionic Layer Adsorption and Reaction (SILAR)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 220, Issue 1, 30 April 2011, Pages 47–53
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