کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
184586 459578 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Upconversion enhancement of lanthanide-doped NaYF4 for quantum dot-sensitized solar cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Upconversion enhancement of lanthanide-doped NaYF4 for quantum dot-sensitized solar cells
چکیده انگلیسی


• As an upconverter, lanthanide-doped NaYF4 has been integrated into the photoanodes for quantum-dot sensitized solar cells to widen the solar light harvesting range.
• The upconverter based solar cells exhibit an obvious increase in the photocurrent generation and the power conversion efficiency.
• Annealing-induced upconversion enhancement could further improve the solar cell performance.

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 14.36 mA/cm2 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.

Upconverters have been integrated into the photoanodes of quantum dot-sensitized solar cells to widen the utilization range of solar light through the upconversion process. The QDSSCs with upconverters demonstrate an enhanced photovoltaic performance with a short-circuit current of 14.36 mA/cm2 and a power conversion efficiency of 4.37%.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 155, 10 February 2015, Pages 357–363
نویسندگان
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