High-efficiency quasi-solid state dye-sensitized solar cells using a polymer blend electrolyte with "polymer-in-salt" conduction characteristics
High-efficiency quasi-solid state dye-sensitized solar cells using a polymer blend electrolyte with "polymer-in-salt" conduction characteristics
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DOI：
10.1016/j.solener.2021.04.051
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发表时间：
2021-05-14
期刊：
影响因子：
6.7
通讯作者：
Papanicolaou, G. C.
中科院分区：
文献类型：
--
作者：
Chalkias, D. A.;Verykokkos, N. E.;Papanicolaou, G. C.
“盐包聚合物”电解质是一种特殊的导电材料，与传统的“盐包聚合物”电解质相比，其表现出更高的导电性。然而，到目前为止，它们被发现不适合染料敏化太阳能电池（DSSC）的应用，主要是因为它们导致增加的电荷复合率。本论文展示了DSSC中的聚合物共混物电解质的开发和应用，该电解质利用了“盐包聚合物”电解质中发现的特征，同时克服了上述缺点。这是通过适当选择用于使液态电解质胶凝的聚合物和聚合物的量来完成的，从而保持氧化还原对浓度固定在高水平。本文中，聚乙烯吡咯烷酮（PVP）作为含氮杂环聚合物的独特性质与聚乙二醇（PEG）溶解大量离子化合物的能力的组合是开发用于DSSC的基于PVP/PEG共混物的聚合物电解质的主要原因。与采用PVP基和PEG基聚合物电解质的DSSC相比，采用聚合物共混物电解质的太阳能电池获得的效率提高了30%。通过在性能最好的聚合物共混物电解质中额外使用两种常用添加剂和先进的多层光阳极，DSSC的效率达到8.21%，这是使用非复合离子液体的无碘化物基聚合物电解质的准固态DSSC的最高报道之一。结果也被发现相当令人满意的相比，所获得的相应的DSSC使用市售的液态电解质，而所提出的电解质的制备是简单的，低成本的，其组成有很大的前景，进一步改进。
"Polymer-in-salt" electrolytes are special conductive materials that demonstrate much higher conductivity compared to the conventional "salt-in-polymer" electrolytes. However, up-to-now, they are found unsuitable for dye-sensitized solar cells (DSSCs) application, mainly because they lead to increased charge recombination rate. The present paper demonstrates the development and application in DSSCs of polymer blend electrolytes that utilize features found in "polymer-in-salt" electrolytes, while the aforementioned drawback is overcome. This is done with the appropriate selection and amount of polymers used to jellify the liquid state electrolyte, keeping the redox couple concentration fixed at a high level. Herein, the unique properties of polyvinylpyrrolidone (PVP), as a nitrogen-containing heterocyclic polymer, in combination with the ability of polyethylene glycol (PEG) to dissolve high quantities of ionic compounds, were the main reasons for developing PVP/PEG blend-based polymer electrolytes for DSSCs. The efficiency attained by the solar cells employing the polymer blend electrolytes was found enhanced up to 30% compared to the corresponding of DSSCs employing the PVP-based and PEG-based polymer electrolytes. By the extra use of two common additives in the best-performing polymer blend electrolyte and an advanced multi-layered photo-anode, the efficiency of DSSCs reached 8.21%, which is one of the highest reported for quasi-solid state DSSCs employing non-composite ionic liquid-free iodide-based polymer electrolytes. The results are also found quite satisfactory compared to the corresponding ones obtained by the DSSCs employing commercially available liquid state electrolytes, while the preparation of the proposed electrolytes is simple and of low-cost, and their composition has great prospects for further improvement.