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Journal of Nanomaterials
Volume 2015, Article ID 921903, 9 pages
http://dx.doi.org/10.1155/2015/921903
Research Article

Efficiency Enhanced Colloidal Mn-Doped Type II Core/Shell ZnSe/CdS Quantum Dot Sensitized Hybrid Solar Cells

1Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology (KTH), 106 91 Stockholm, Sweden
2Department of Applied Physics/Bimolecular Physics, School of Science, Royal Institute of Technology (KTH), 106 91 Stockholm, Sweden
3Organic Chemistry, Centre of Molecular Devices, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), 100 44 Stockholm, Sweden

Received 15 June 2015; Revised 16 July 2015; Accepted 2 August 2015

Academic Editor: Jun Chen

Copyright © 2015 A. Jamshidi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Colloidal Mn-doped ZnSe/CdS core/shell quantum dots (QDs) are synthesized for the first time and employed as a strategy to boost the power conversion efficiency of quantum dot sensitized solar cells. By using Mn-doping as a band gap engineering tool for core/shell QDs an effective improvement of absorption spectra could be obtained. The mid-states generated by a proper Mn content alleviate carrier separation and enhance the electron injection rate, thus facilitating electron transport to the TiO2 substrate. It is demonstrated that a device constructed with 0.25% Mn-doped ZnSe/CdS leads to an enhancement of the electron injection rate and power conversion efficiency by 4 times and 1.3, respectively.