Wavelength Conversion Lanthanide(III)-cored Complex for Highly Efficient Dye-sensitized Solar Cells
作者:Jung-Hwan Oh、Hae-Min Song、Yu-Kyung Eom、Jung-Ho Ryu、Myung-Jong Ju、Hwan-Kyu Kim
DOI:10.5012/bkcs.2011.32.8.2743
日期:2011.8.20
Lanthanide(III)-cored complex as a wavelength conversion material has been successfully designed and synthesized for highly efficient dye-sensitized solar cells, for the first time, since light with a short wavelength has not been effectively used for generating electric power owing to the limited absorption of these DSSCs in the UV region. A black dye (BD) was chosen and used as a sensitizer, because BD has a relatively weak light absorption at shorter wavelengths. The overall conversion efficiency of the BD/WCM device was remarkably increased, even with the relatively small amount of WCM added to the device. The enhancement in $V_oc}$ by WCM, like DCA, could be correlated with the suppression of electron recombination between the injected electrons and $I_3^-}$ ions. Furthermore, the short-circuit current density was significantly increased by WCM with a strong UV light-harvesting effect. The energy transfer from the Eu(III)-cored complex to the $TiO_2$ film occurred via the dye, so the number of electrons injected into the $TiO_2$ surface increased, i.e., the short-circuit current density was increased. As a result, BD/WCM-sensitized solar cells exhibit superior device performance with the enhanced conversion efficiency by a factor of 1.22 under AM 1.5 sunlight: The photovoltaic performance of the BD/WCM-based DSSC exhibited remarkably high values, $J_sc}$ of 17.72 mA/$cm^2$, $V_oc}$ of 720 mV, and a conversion efficiency of 9.28% at 100 mW $cm^-2}$, compared to a standard DSSC with $J_sc}$ of 15.53 mA/$cm^2$, $V_oc}$ of 689 mV, and a conversion efficiency of 7.58% at 100 mW $cm^-2}$. Therefore, the Eu(III)-cored complex is a promising candidate as a new wavelength conversion coadsorbent for highly efficient dye-sensitized solar cells to improve UV light harvesting through energy transfer processes. The abstract should be a single paragraph which summaries the content of the article.
由于短波长的光在紫外区的吸收有限,这些 DSSC 无法有效地用于发电,因此首次成功设计和合成了作为波长转换材料的镧系(III)有芯配合物,用于高效染料敏化太阳能电池。由于黑色染料(BD)在较短波长处的光吸收相对较弱,因此被选为敏化剂。BD/WCM 器件的整体转换效率显著提高,即使添加的 WCM 相对较少。与 DCA 一样,WCM 对 $V_oc}$ 的增强可能与抑制注入电子和 $I_3^-}$ 离子之间的电子重组有关。此外,WCM 还显著提高了短路电流密度,具有很强的紫外光收集效应。从 Eu(III)-cored 复合物到 $TiO_2$ 薄膜的能量转移是通过染料实现的,因此注入 $TiO_2$ 表面的电子数量增加,即短路电流密度增加。因此,BD/WCM 敏化太阳能电池表现出卓越的器件性能,在 AM 1.5 阳光下的转换效率提高了 1.22 倍:基于 BD/WCM 的 DSSC 的光电性能值非常高,$J_sc}$为 17.72 mA/$cm^2$,$V_oc}$为 720 mV,转换效率为 9.相比之下,标准 DSSC 的 $J_sc}$ 为 15.53 mA/$cm^2$,$V_oc}$ 为 689 mV,100 mW $cm^-2}$ 时的转换效率为 7.58%。因此,Eu(III)掺杂复合物有望成为高效染料敏化太阳能电池的新型波长转换共吸附剂,通过能量转移过程改善紫外光收集。摘要应为概述文章内容的一个单独段落。