Can a temporary bond between dye and redox mediator increase the efficiency of p-type dye-sensitized solar cells?
Can a temporary bond between dye and redox mediator increase the efficiency of p-type dye-sensitized solar cells?
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DOI：
10.1007/s00894-018-3848-8
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发表时间：
2018-10
影响因子：
2.2
通讯作者：
Stefan Merker;H. Krautscheid;Stefan Zahn
中科院分区：
文献类型：
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作者：
Stefan Merker;H. Krautscheid;Stefan Zahn
自1991年O 'Reagan和Grätzel的开创性工作以来，高效的n型染料敏化太阳能电池是已知的。然而，迄今为止还没有开发出高效的p型染料敏化太阳能电池。这阻碍了串联染料敏化太阳能电池的构建，而串联染料敏化太阳能电池的性能可以超过n型器件。在这项工作中，我们调查，如果一个临时的协调过渡金属为基础的氧化还原介质在敏化剂可以提高效率的p型染料敏化太阳能电池。基于计算筛选，选择不同的Cu，Ni和Co氧化还原介体来构建p型染料敏化太阳能电池。不幸的是，所研究的设备的效率不超过类似的电池与碘化物-三碘化物作为氧化还原介体。虽然Ni和Cu络合物可以分别还原为Ni（0）和Cu（0），但是所研究的Co络合物有效地淬灭激发态。因此，从半导体注入的必要电子太慢，这阻碍了高效p型染料敏化太阳能电池的构建。图形摘要p型染料敏化太阳能电池作用模式的比较。虽然顶部显示了传统的，底部显示了研究的设备，其中染料和氧化还原介体之间的临时连接起着至关重要的作用。
Efficient n-type dye-sensitized solar cells are known since the seminal work of O’Reagan and Grätzel in 1991. However, highly efficient p-type dye-sensitized solar cells have not been developed so far. This hinders the construction of tandem dye-sensitized solar cells, which can surpass the performance of n-type devices. Within this work, we investigate if a temporary coordination of transition metal-based redox mediators at a sensitizer can increase the efficiency of p-type dye-sensitized solar cells. Based on a computational screening, diverse Cu, Ni, and Co redox mediators were selected to construct p-type dye-sensitized solar cells. Unfortunately, the efficiency of the investigated devices does not surpass analogous cells with iodide-triiodide as redox mediator. While Ni and Cu complexes might be reduced to Ni(0) and Cu(0), respectively, the investigated Co-complex quenches the excited state efficiently. As a result, the necessary electron injection from the semiconductor is too slow, which hinders the construction of a highly efficient p-type dye-sensitized solar cell.Graphical AbstractComparison of the mode of action of p-type dye-sensitized solar cells. While top shows the traditional one, bottom shows the investigated devices where a temporary link between dye and redox mediator plays a crucial role.