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首页> 外文期刊>RSC Advances >Stepwise co-sensitization of two metal-based sensitizers: probing their competitive adsorption for improving the photovoltaic performance of dye-sensitized solar cells
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Stepwise co-sensitization of two metal-based sensitizers: probing their competitive adsorption for improving the photovoltaic performance of dye-sensitized solar cells

机译：两种金属基敏化剂的逐步共敏化：探测它们的竞争性吸附，以改善染料敏化太阳能电池的光伏性能

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How to graft co-sensitizers with different binding strengths onto TiO2 surfaces for enhancing the performance of dye-sensitized solar cells (DSSCs) has not been discussed very much. Herein a ruthenium-based sensitizer (N719) and a porphyrin molecule (LP-2) with complementary absorption spectra (300–750 nm) have been chosen to investigate how the dye loading procedure would influence the photovoltaic performance of co-sensitized solar cells. Interestingly, it is found that 54.7% of the loading amounts of pre-adsorbed LP-2 are replaced by the post-adsorption of N719. The replacement adsorption is not observed when the two molecules are loaded in reverse order, which is attributed to their different adsorption configurations and binding energies. The competitive adsorption between co-sensitizers is thus systematically investigated by UV-visible absorption spectroscopy, energy dispersive spectrometry (EDS) and electron probe microanalysis (EPMA). Upon optimization, the device sequentially sensitized with LP-2 and N719 exhibits efficiency (7.72%) enhancement of 38.6% and 18.0% compared with those fabricated with single LP-2 and N719, respectively. The results provide a new vision on the stepwise sensitization of TiO2 films using co-sensitizers with a difference in adsorption properties, suggesting that complementary spectral absorption of co-sensitizers can lead to excellent cell performance by choosing an appropriate dye loading procedure.
机译：如何将具有不同结合强度的共敏化剂接枝到TiO 2 表面上以增强染料敏化太阳能电池（DSSC）的性能尚未得到太多讨论。在此，选择了钌基敏化剂（N719）和具有互补吸收光谱（300–750 nm）的卟啉分子（LP-2），以研究染料加载程序如何影响共敏化太阳能电池的光伏性能。有趣的是，发现预先吸附的LP-2的负载量的54.7％被N719的后吸附所代替。当两个分子以相反顺序加载时，未观察到置换吸附，这归因于它们的不同吸附构型和结合能。因此，通过紫外-可见吸收光谱，能量分散光谱（EDS）和电子探针微分析（EPMA）系统地研究了共敏化剂之间的竞争性吸附。经过优化，与分别使用单个LP-2和N719制造的器件相比，依次用LP-2和N719敏化的器件的效率（7.72％）增强了38.6％和18.0％。结果为使用吸附性能不同的共增敏剂逐步增敏TiO 2 薄膜提供了新的认识，表明共增敏剂的互补光谱吸收可以导致通过选择适当的染料加载程序，可确保电池具有出色的性能。

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