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首页> 外文期刊>Physical chemistry chemical physics: PCCP >Insights into mechanical compression and the enhancement in performance by Mg(OH)_2 coating in flexible dye sensitized solar cells
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Insights into mechanical compression and the enhancement in performance by Mg(OH)_2 coating in flexible dye sensitized solar cells

机译：Mg（OH）_2涂层对柔性染料敏化太阳能电池的机械压缩和性能增强的见解

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摘要

The engineering of flexible dye sensitized solar cells (DSCs) by mechanical compression is one of the methods that allow low temperature processing of these devices. However, suppressing the high temperature sintering process also significantly reduces the performance of the cells. In our previous work [J. Phys. Chem. C, 2012, 116, 1211], we have attempted to improve flexible DSC performance by coating the porous TiC>2 photoanode with an electrodeposited Mg(OH)_2 layer. In that work, we have obtained one of the highest photovoltages reported to date in flexible DSCs (847 mV). In order to gain more insights into the reasons for both poorer performance of compressed cells and the origin of the voltage enhancement achieved by the Mg(OH)_2 coating, here we present an in-depth study by means of electrochemical impedance spectroscopy, Mott-Schottky plots analysis and open-circuit voltage decays. The existence of a shunt resistance in the mechanically compressed cells is revealed, causing an additional drawback to the poor inter-particle necking. By introducing the Mg(OH)_2 coating the recombination in the cell becomes significantly reduced, being the key reason which is responsible for the higher photovoltage. Additionally, the coating and the compression cause modifications in the surface states and in the nature of the interfaces with the electrolyte. This induces TiO_2 conduction band displacements and shifts of the relative position of the modified states that influence the performance.
机译：通过机械压缩对柔性染料敏化太阳能电池（DSC）进行工程设计是允许对这些设备进行低温处理的方法之一。然而，抑制高温烧结过程也显着降低了电池的性能。在我们以前的工作中[J.物理化学C，2012，116，1211]，我们已尝试通过在多孔TiC> 2光电阳极上涂覆电沉积的Mg（OH）_2层来改善柔性DSC性能。在这项工作中，我们获得了迄今为止报道的柔性DSC中最高的光电压之一（847 mV）。为了深入了解压缩电池性能较差的原因以及Mg（OH）_2涂层实现电压增强的原因，在这里，我们通过电化学阻抗谱Mott-肖特基曲线图分析和开路电压衰减。揭示了机械压缩的电池中存在分流电阻，这导致了不良的颗粒间颈缩的另一个缺点。通过引入Mg（OH）_2涂层，电池中的重组显着降低，这是造成较高光电压的关键原因。另外，涂层和压缩引起表面状态和与电解质的界面性质的改变。这会引起TiO_2导带位移和影响性能的改性态相对位置的偏移。

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