Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 22, Pages 19825-19832Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am505194k
Keywords
CeO2; CeO2:Eu3+; downconversion; dye-sensitized solar cell; europium; light-scattering; photoluminescence
Funding
- Global Frontier R&D Program on the Center for Multiscale Energy System - National Research Foundation under Ministry of Science, ICT Future, Korea [2011-0031573]
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Single-crystalline, octahedral CeO2:Eu3+ nanocrystals, successfully prepared using a simple hydrothermal method, were investigated to determine their photovoltaic properties in an effort to enhance the light-harvesting efficiency of dye-sensitized solar cells (DSSCs). The size of the CeO2:Eu3+ nanocrystals (300-400 nm), as well as their mirrorlike facets, significantly improved the diffuse reflectance of visible light. Excitation of the CeO2:Eu3+ nanocrystal with 330 nm ultraviolet light was re-emitted via downconversion photoluminescence (PL) from 570 to 672 nm, corresponding to the ((5))D-0 -> F-7(J) transition in the Eu3+ ions. Downconversion PL was dominant at 590 nm and had a maximum intensity for 1 mol % Eu3+. The CeO2:Eu3+ nanocrystal-based DSSCs exhibited a power conversion efficiency of 8.36%, an increase of 14%, compared with conventional TiO2 nanoparticle-based DSSCs, because of the strong light-scattering and downconversion PL of the CeO2:Eu3+ nanocrystals.
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