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Nanomaterials 2016, 6(6), 97; doi:10.3390/nano6060097

Improving the Photocurrent in Quantum-Dot-Sensitized Solar Cells by Employing Alloy PbxCd1−xS Quantum Dots as Photosensitizers

1,†,‡
,
2,†
,
1
,
1
,
2,* and 1,*
1
Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, 10691 Stockholm, Sweden
2
Center of Molecular Devices, Department of Chemistry, School of Chemical Science and Engineering, Royal Institute of Technology, 10044 Stockholm, Sweden
These authors contributed equally to the paper.
Present address: Department of Chemistry, Stanford University, Stanford, CA 94305, USA
*
Authors to whom correspondence should be addressed.
Academic Editor: Guanying Chen
Received: 6 April 2016 / Revised: 16 May 2016 / Accepted: 20 May 2016 / Published: 25 May 2016
(This article belongs to the Special Issue Nanostructured Solar Cells)
View Full-Text   |   Download PDF [3335 KB, uploaded 27 May 2016]   |  

Abstract

Ternary alloy PbxCd1−xS quantum dots (QDs) were explored as photosensitizers for quantum-dot-sensitized solar cells (QDSCs). Alloy PbxCd1−xS QDs (Pb0.54Cd0.46S, Pb0.31Cd0.69S, and Pb0.24Cd0.76S) were found to substantially improve the photocurrent of the solar cells compared to the single CdS or PbS QDs. Moreover, it was found that the photocurrent increases and the photovoltage decreases when the ratio of Pb in PbxCd1−xS is increased. Without surface protecting layer deposition, the highest short-circuit current density reaches 20 mA/cm2 under simulated AM 1.5 illumination (100 mW/cm2). After an additional CdS coating layer was deposited onto the PbxCd1−xS electrode, the photovoltaic performance further improved, with a photocurrent of 22.6 mA/cm2 and an efficiency of 3.2%. View Full-Text
Keywords: quantum dot-sensitized solar cells; photocurrent; alloy; PbS quantum dot-sensitized solar cells; photocurrent; alloy; PbS
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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. (CC BY 4.0).

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Yuan, C.; Li, L.; Huang, J.; Ning, Z.; Sun, L.; Ågren, H. Improving the Photocurrent in Quantum-Dot-Sensitized Solar Cells by Employing Alloy PbxCd1−xS Quantum Dots as Photosensitizers. Nanomaterials 2016, 6, 97.

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