Control of the distance between porphyrin sensitizers and the TiO2 surface in solar cells by designed anchoring groups
Control of the distance between porphyrin sensitizers and the TiO2 surface in solar cells by designed anchoring groups
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DOI：
10.1016/j.molstruc.2019.06.074
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发表时间：
2019-11-15
影响因子：
3.8
通讯作者：
Serpa, Carlos
中科院分区：
文献类型：
--
作者：
Monteiro, Carlos J. P.;Jesus, Patricia;Serpa, Carlos
通过合理的设计和合成，研究了它们的结构、性质和吸附几何构型之间的关系，以及它们在染料敏化太阳能电池中作为染料的相对性能。对新型不对称N-羟基酸氨基苯基卟啉的光物理、电化学和二氧化钛锚定性能进行了评价。大多数染料的激发态能量与二氧化钛导带的能量匹配良好。根据卟啉的不同，只有一个羧基锚基或两个N-乙醇酸氨基苯基连接到相反和相邻的苯基上，就会发生锚定在二氧化钛上的现象。研究发现，表面覆盖率归一化后的电池效率受到吸附几何形状和间隔基连接基灵活性的强烈影响。卟啉核心与二氧化钛表面之间的有效距离对电池效率至关重要。该数据与通过空间电子转移是一致的，通过位于相邻苯基上的N-乙醇酸取代基来锚定会导致更高的表面复盖率，归一化电池效率。(C)2019爱思唯尔B.V.保留所有权利。
Unsymmetrical porphyrins were rationally-designed and synthesized to investigate the relation between their structure, properties and adsorption geometries, and their relative performance as dyes in dye-sensitized solar cells. Photophysics, electrochemical and TiO2 anchoring properties of the new unsymmetrical N-glycolic acid amino phenyl porphyrins were evaluated. Most dyes showed good energy matching between excited state energies and the TiO2 conduction band. Depending on the porphyrins, anchoring to TiO2 occurred with only one carboxyl anchor group or with two N-glycolic acid amino phenyl connected to opposite and adjacent phenyl groups. It was found that cell efficiencies normalized for surface coverage are strongly affected by the adsorption geometry and spacer linker flexibility. The effective distance between the porphyrin core and the TiO2 surface has key importance in cell efficiencies. The data is consistent with a through-space electron transfer and anchoring via N-glycolic acid substituents located in adjacent phenyl groups results in higher surface coverage normalized cell efficiencies. (C) 2019 Elsevier B.V. All rights reserved.