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High-performance dye-sensitized solar cells with gel-coated binder-free carbon nanotube films as counter electrode

机译：高性能染料敏化太阳能电池，带有无胶涂层的碳纳米管薄膜作为对电极

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摘要

High-performance dye-sensitized solar cells (DSCs) with binder-free films of carbon nanotubes (CNTs), including single-walled CNTs (SWCNTs) and multi-walled CNTs (MWCNTs), as the counter electrode are reported. The CNT films were fabricated by coating gels, which were prepared by dispersing CNTs in low-molecular-weight poly(ethylene glycol) (PEG) through mechanical grinding and subsequent ultrasonication, on fluorine tin oxide (FTO) glass. PEG was removed from the CNT films through heating. These binder-free CNT films were rough and exhibited good adhesion to substrates. They were used as the counter electrode of DSCs. The DSCs with SWCNT or MWCNT counter electrodes exhibited a light-to-electricity conversion efficiency comparable with that with the conventional platinum (Pt) counter electrode, when the devices were tested immediately after device fabrication. The DSCs with an SWCNT counter electrode exhibited good stability in photovoltaic performance. The efficiency did not decrease after four weeks. On the other hand, DSCs with the MWCNT or Pt counter electrode exhibited a remarkable decrease in the photovoltaic efficiency after four weeks. The high photovoltaic performance of these DSCs is related to the excellent electrochemical catalysis of CNTs on the redox of the iodide/triiodide pair, as revealed by the cyclic voltammetry and ac impedance spectroscopy.
机译：据报道，高性能的染料敏化太阳能电池（DSC）具有无粘合剂的碳纳米管（CNT）膜，其中包括单壁CNT（SWCNT）和多壁CNT（MWCNT），作为对电极。碳纳米管薄膜是通过涂覆凝胶制备的，该凝胶是通过将碳纳米管通过机械研磨和随后的超声处理分散在低分子量聚乙二醇（PEG）中的方法制成的，然后将其分散在氟氧化锡（FTO）玻璃上。通过加热从CNT膜去除PEG。这些无粘合剂的CNT膜是粗糙的，并且表现出对基材的良好粘附性。它们被用作DSC的反电极。当在器件制造后立即对器件进行测试时，带有SWCNT或MWCNT对电极的DSC的光电转换效率可与常规铂（Pt）对电极相比。具有SWCNT对电极的DSC在光伏性能方面表现出良好的稳定性。四周后效率没有下降。另一方面，带有MWCNT或Pt对电极的DSC在四周后显示出光伏效率的显着下降。这些DSC的高光伏性能与CNT在碘化物/三碘化物对的氧化还原上的出色电化学催化作用有关，如循环伏安法和交流阻抗谱所揭示的那样。

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