Issue 19, 2016

Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%

Abstract

The power conversion efficiencies (PCEs) of PbS quantum dot sensitized solar cells (QDSCs) reported are typically below 6%. This poor efficiency is mainly derived from the serious charge recombination in internal QDs and at the interface of QDs/TiO2/electrolyte. In this work, PbS/CdS QDs with a core/shell structure, which were used as the photosensitizer to fabricate sensitized solar cells, were prepared through the ion exchange method. With the reduced trapping state defects on the surface of the PbS QDs and resulting effective suppression of adverse charge recombination, the PbS/CdS QD-based cells have been improved remarkably in comparison with the pristine PbS-based QDSCs. By optimization of the thickness of the CdS shell, a PCE of 7.19% under one full sun illumination was obtained on the fabricated devices, which is among the best performances for liquid-junction PbS QDSCs.

Graphical abstract: Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%

Supplementary files

Article information

Article type
Paper
Submitted
24 mar 2016
Accepted
09 apr 2016
First published
11 apr 2016

J. Mater. Chem. A, 2016,4, 7214-7221

Surface engineering of PbS quantum dot sensitized solar cells with a conversion efficiency exceeding 7%

S. Jiao, J. Wang, Q. Shen, Y. Li and X. Zhong, J. Mater. Chem. A, 2016, 4, 7214 DOI: 10.1039/C6TA02465C

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