用于性能增强型染料敏化太阳能电池的双功能CeO2:Eu3+纳米晶体
Dual-functional CeO2:Eu3+ nanocrystals for performance-enhanced dye-sensitized solar cells.
作者信息
Roh Jongmin, Hwang Sun Hye, Jang Jyongsik
机构信息
School of Chemical and Biological Engineering, College of Engineering, Seoul National University , 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea.
出版信息
ACS Appl Mater Interfaces. 2014 Nov 26;6(22):19825-32. doi: 10.1021/am505194k. Epub 2014 Nov 5.
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 5D0→7FJ 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.
采用简单水热法成功制备出单晶八面体CeO₂:Eu³⁺纳米晶体，对其光伏性能进行了研究，以提高染料敏化太阳能电池（DSSC）的光捕获效率。CeO₂:Eu³⁺纳米晶体的尺寸（300 - 400 nm）及其镜面状晶面显著提高了可见光的漫反射率。用330 nm紫外光激发CeO₂:Eu³⁺纳米晶体，通过从570到672 nm的下转换光致发光（PL）重新发射，这对应于Eu³⁺离子中的⁵D₀→⁷F_J跃迁。下转换PL在590 nm处占主导，对于1 mol% Eu³⁺具有最大强度。基于CeO₂:Eu³⁺纳米晶体的DSSC表现出8.36%的功率转换效率，与传统的基于TiO₂纳米颗粒的DSSC相比提高了14%，这归因于CeO₂:Eu³⁺纳米晶体的强光散射和下转换PL。
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