Cyanine dyes in solid state organic heterojunction solar cells

J. Heier, Chuyao Peng, A. Véron, R. Hany, T. Geiger, F. Nüesch, Marcus Vinícius Gonçalves Vismara, Carlos Frederico de Oliveira Graeff
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引用次数: 2

Abstract

Today numerous cyanine dyes that are soluble in organic solvents are available, driven by more than a century of research and development of the photographic industry. Several properties specific to cyanine dyes suggest that this material class can be of interest for organic solar cell applications. The main absorption wavelength can be tuned from the ultra-violet to the near-infrared. The unparalleled high absorption coefficients allow using very thin films for harvesting the solar photons. Furthermore, cyanines are cationic polymethine dyes, offering the possibility to modify the materials by defining the counteranion. We here show specifically how counterions can be utilized to tune the bulk morphology when blended with fullerenes. We compare the performance of bilayer heterojunction and bulk heterojunction solar cells for two different dyes absorbing in the visible and the near-infrared. Light-induced Electron Spin Resonance (LESR) was used to study the charge transfers of light induced excitons between cyanine dyes and the archetype fullerene C60. LESR results show good correlation with the cell performance.
固态有机异质结太阳能电池中的菁染料
在照相工业一个多世纪的研究和发展的推动下,今天有许多可溶于有机溶剂的菁染料可供使用。花青素染料的一些特性表明,这类材料可以用于有机太阳能电池的应用。主要的吸收波长可以从紫外线调到近红外线。无与伦比的高吸收系数允许使用非常薄的薄膜来收集太阳光子。此外,花青素是阳离子聚甲基染料,提供了通过定义反阴离子来修饰材料的可能性。我们在这里特别展示了当与富勒烯混合时,如何利用反离子来调整体积形态。我们比较了双层异质结和块状异质结太阳能电池在可见光和近红外吸收两种不同染料的性能。利用光致电子自旋共振(LESR)研究了花青素染料与原型富勒烯C60之间光致激子的电荷转移。LESR结果与电池性能有良好的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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