Wahyuono Ruri Agung, Schulze Benjamin, Rusu Mihai, Wächtler Maria, Dellith Jan, Seyring Martin, Rettenmayr Markus, Plentz Jonathan, Ignaszak Anna, Schubert Ulrich S, Dietzek Benjamin
Leibniz Institute of Photonic Technology (IPHT) Jena e.V., Albert-Einstein-Strasse 9, 07745, Jena, Germany.
Institute for Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743, Jena, Germany.
Chempluschem. 2016 Dec;81(12):1281-1291. doi: 10.1002/cplu.201600377. Epub 2016 Sep 20.
A series of thiocyanate-free bis(tridentate) ruthenium(II) complexes incorporating 1,2,3-triazole-derived NNN-, NCN-, and CNC-coordinating ligands has been employed for sensitizing ZnO photoanodes for dye-sensitized solar cells (DSSCs). Additionally, the first use of the TEMPO /TEMPO (2,2,6,6-tetramethyl-piperidine-1-oxyl) redox mediator as a surrogate for the I /I redox couple in ZnO nanostructured DSSCs is presented. Compared with I /I -based electrolytes, shorter charge lifetimes and diffusion lengths were determined for the TEMPO /TEMPO-based electrolyte. Nonetheless, similar power conversion efficiencies (PCEs) were achieved with both electrolytes for the RuNCN and RuCNC complexes, whereas higher PCEs are enabled by the iodine-free electrolyte in case of RuNNN. The combination of the molecular sensitizers and the TEMPO-based electrolyte exhibits relatively high external quantum efficiency (EQE) and promising PCEs, ranging from 4.48 to 1.47 %, which are-in part-comparable to that of ZnO-DSSCs with the benchmark N749 black dye. The TEMPO-based electrolyte also exhibits less absorption compared with its I /I counterpart, a favorable feature for enhancing the light harvesting ability of the photoanode. Furthermore, the results show the effect of the dye-sensitization procedure on the PCE values: The use of ethanol as the solvent compared with methanol increases the DSSC's efficiency, which is attributed to improved chemisorption of the sensitizer onto the ZnO surface.
一系列含有1,2,3-三唑衍生的NNN-、NCN-和CNC-配位配体的无硫氰酸根双（三齿）钌（II）配合物已被用于敏化染料敏化太阳能电池（DSSC）的ZnO光阳极。此外，还介绍了首次将TEMPO/TEMPO（2,2,6,6-四甲基哌啶-1-氧基）氧化还原介质用作ZnO纳米结构DSSC中I⁻/I⁻氧化还原对的替代物。与基于I⁻/I⁻的电解质相比，基于TEMPO/TEMPO的电解质的电荷寿命和扩散长度较短。尽管如此，RuNCN和RuCNC配合物使用这两种电解质都实现了相似的功率转换效率（PCE），而在RuNNN的情况下，无碘电解质实现了更高的PCE。分子敏化剂和基于TEMPO的电解质的组合表现出相对较高的外量子效率（EQE）和有前景的PCE，范围为4.48%至1.47%，部分与具有基准N749黑色染料的ZnO-DSSC相当。与基于I⁻/I⁻的电解质相比，基于TEMPO的电解质的吸收也较少，这是增强光阳极光捕获能力的有利特征。此外，结果显示了染料敏化程序对PCE值的影响：与甲醇相比，使用乙醇作为溶剂提高了DSSC的效率，这归因于敏化剂在ZnO表面的化学吸附得到改善。
