Journal
ELECTROCHIMICA ACTA
Volume 155, Issue -, Pages 357-363Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.11.131
Keywords
Upconversion; Lanthanide-doped NaYF4; Photoanode; Quantum dot-sensitized solar cell
Categories
Funding
- National Natural Science Foundation of China [91333120]
- Ph.D. Programs Foundation of Ministry of Education of China [30400002011127001]
- National Basic Research Program [2011CB935704, 2012CB720904]
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As an upconverter, lanthanide-doped NaYF4 (Ln-NaYF4) has been integrated into the photoanodes for quantum-dot sensitized solar cells. Compared with the solar cells with pure TiO2, the upconverter based solar cells exhibited a 17.6% increase in the photocurrent and a 20% increase in the power conversion efficiency. Furthermore, when the integrated Ln-NaYF4 is pretreated by annealing, the resulting photoanode demonstrates an obvious improvement in the photocurrent generation and the power conversion efficiency due to the annealing-induced enhancement of the upconversion emission as well as the elimination of the defects allowing for efficiently reducing charge recombination. The best photovoltaic performance with a short-circuit current of 14.36mA/cm(2) and a power conversion efficiency of 4.37% has been obtained with the solar cells containing the annealed upconverters. Both the solar cells integrated with the Ln-NaYF4 pretreated by annealing or not demonstrate obvious photocurrent responses under the illumination of the NIR light. This finding demonstrates the feasibility of the combination of the up-converting materials with quantum dot-sensitized solar cells to extend the exploitation of the solar light to a wider range thus enabling the fabrication of highly efficient solar cells. (C) 2014 Elsevier Ltd. All rights reserved.
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