Dual-Functional CeO2:Eu3+ Nanocrystals for Performance-Enhanced Dye-Sensitized Solar Cells

作者：Roh Jongmin; Hwang Sun Rye; Jang Jyongsik^*

来源：ACS Applied Materials & Interfaces, 2014, 6(22): 19825-19832.

DOI：10.1021/am505194k

• CeO2
• CeO2:Eu3+
• downconversion
• dye-sensitized solar cell
• europium
• light-scattering
• photoluminescence

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.

• 出版日期2014-11-26