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> (2015) Enhanced Photovoltaic Performance of DSSC
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(2015) Enhanced Photovoltaic Performance of Dye-Sensitized Solar Cells by Efficient Near-Infrared Sunlight Harvesting using Upconverting Y2O3:Er3+/Yb3+ Phosphor Nanoparticles
Источники:
- https://nanoscalereslett.springeropen.com/a...1671-015-1030-0
https://doi.org/10.1186/s11671-015-1030-0

QUOTE
We report the efficiency enhancement in dye-sensitized solar cells (DSSCs) using Er3+/Yb3+-co-doped Y2O3 (i.e., Y2O3:Er3+/Yb3+) phosphor nanoparticles, prepared by a simple and cost-effective urea-based homogeneous precipitation method, for efficient near-infrared (NIR) sunlight harvesting. Under the light excitation at a wavelength of 980 nm, the as-prepared samples exhibited strong upconversion emissions at green and red visible wavelengths. To investigate the influence of Y2O3:Er3+/Yb3+ nanoparticles on the photovoltaic performance of DSSCs, the phosphor nanoparticles were incorporated into titanium dioxide films to form a composite photoelectrode.

For the resulting DSSCs, the increased power conversion efficiency (PCE) of 6.68 % was obtained mainly by the increased photocurrent of J SC = 13.68 mA/cm2 due to the light harvesting enhancement via the NIR-to-visible upconversion process (cf., PCE = 5.94 %, J SC = 12.74 mA/cm2 for the reference DSSCs without phosphor nanoparticles), thus, indicating the PCE increment ratio of ~12.4 %.


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Characterization

The phase structure of the fabricated nanophosphor samples was analyzed by using an X-ray diffractometer (XRD; Mac Science, M18XHF-SRA) with Cu Kα (λ = 1.5402 Å) radiation, and the JADE software was applied to analyze the XRD data. The structural morphology was observed by using a transmission electron microscope (TEM; JEM-2100 F, JEOL). The room-temperature UC spectrum was checked by using a fluorescence spectrophotometer (Ocean optics USB 4000) under the excitation of a laser light at a wavelength (λ) of 980 nm with a pump power of 660 mW. The optical transmission and reflection spectra of dye-sensitized photoanodes with and without Y2O3:Er3+/Yb3+ phosphor nanoparticles were characterized by using a UV–vis-NIR spectrophotometer (Cary 5000, Varian). The J-V curves were measured by using a photocurrent system consisting of a solar simulator (ABET, SUN 3000) with a 1000 W Xe short-arc lamp and a source meter (Keithley 2400). The IPCE spectra from 300 to 800 nm were evaluated by using a 300 W xenon arc lamp as the light source coupled to a monochromator (TLS-300× xenon light source, Newport) with an optical power meter (2935-c, Newport).


This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (No. 2014–069441).


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