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首页> 外文期刊>RSC Advances >Pyridyl vs. bipyridyl anchoring groups of porphyrin sensitizers for dye sensitized solar cells
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Pyridyl vs. bipyridyl anchoring groups of porphyrin sensitizers for dye sensitized solar cells

机译：吡啶基与染色荧光致敏太阳能电池卟啉敏化剂的双吡啶基锚固组

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The synthesis of two porphyrins with donor–π–acceptor (D–π–A) molecular architecture is described, namely Znpor-py ( 3a ) and Znpor-bpy ( 3b ), which consist of a 4- tert -butyl-phenyl group as donor and either a pyridine or a bipyridine group as acceptor at opposite positions of the porphyrin macrocycle. Photophysical and electrochemical properties of the two compounds, as well as theoretical DFT calculation results suggest that the two porphyrins have the potential to act as sensitizers in dye-sensitized solar cells (DSSCs). Both dyes contain N (pyridyl) atoms able to act as anchors onto the acid sites of TiO _(2) . A Znpor-py ( 3a ) sensitized solar cell was found to exhibit power conversion efficiency (PCE) of 3.57%, while the corresponding Znpor-bpy ( 3b )-functionalized solar cell showed a higher PCE of 5.08%. The enhanced short circuit current J _(sc) and open circuit voltage V _(oc) parameters are the main factors responsible for the improved photovoltaic performance of the latter solar cell. These are attributed to its faster charge injection into the TiO _(2) photoanode and its reduced charge recombination at the electrode/electrolyte interface, which result from the stronger binding and coordination geometry of the bipyridine anchoring group on TiO _(2) . Electrochemical impedance spectra (EIS) of the two solar cells further support these assumptions, revealing a higher charge recombination resistance R _(rec) and a longer electron lifetime τ _(e) for the Znpor-bpy ( 3b ) sensitized solar cell.
机译：描述了两个卟啉与供体-π-受体（D-π-A）分子结构的合成，即Znpor-py（3a）和Znpor-bpy（3b），其由4-叔丁基 - 苯基组成作为供体和吡啶或吡啶基团作为卟啉宏循环相对位置的受体。两种化合物的光物理和电化学性质以及理论DFT计算结果表明，两个卟啉有可能作为染料敏化太阳能电池（DSSCs）中的敏化剂。两种染料含有N（吡啶基）原子，能够充当TiO _（2）的酸位点上的锚。发现Znpor-py（3a）敏化太阳能电池显示出功率转换效率（PCE）为3.57％，而相应的Znpor-Bpy（3b） - 功能化太阳能电池显示出较高的PCE为5.08％。增强的短路电流J _（SC）和开路电压V _（OC）参数是负责改进后者太阳能电池的光伏性能的主要因素。这些归因于其更快的电荷注入TiO _（2）光电亮片及其在电极/电解质界面上的减少电荷重组，这是由TiO _（2）上的Bi0吡啶锚固基团的较强的结合和配位几何形状产生。两种太阳能电池的电化学阻抗谱（EIS）进一步支持这些假设，揭示Znpor-Bpy（3B）敏化太阳能电池的更高电荷重组电阻R _（REC）和更长的电子寿命τ_（e）。

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