Enhancing the Hole-Conductivity of Spiro-OMeTAD without Oxygen or Lithium Salts by Using Spiro(TFSI)2 in Perovskite and Dye-Sensitized Solar Cells

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• 作者：William H. Nguyen ; Colin D. Bailie ; Eva L. Unger ; Michael D. McGehee
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：August 6, 2014
• 年：2014
• 卷：136
• 期：31
• 页码：10996-11001
• 全文大小：349K
• ISSN：1520-5126

文摘

2,2鈥?7,7鈥?Tetrakis(N,N-di-p-methoxyphenylamine)-9,9鈥?spirobifluorene (spiro-OMeTAD), the prevalent organic hole transport material used in solid-state dye-sensitized solar cells and perovskite-absorber solar cells, relies on an uncontrolled oxidative process to reach appreciable conductivity. This work presents the use of a dicationic salt of spiro-OMeTAD, named spiro(TFSI)₂, as a facile means of controllably increasing the conductivity of spiro-OMeTAD up to 10^鈥? S cm^鈥? without relying on oxidation in air. Spiro(TFSI)₂ enables the first demonstration of solid-state dye-sensitized solar cells fabricated and operated with the complete exclusion of oxygen after deposition of the sensitizer with higher and more reproducible device performance. Perovskite-absorber solar cells fabricated with spiro(TFSI)₂ show improved operating stability in an inert atmosphere. Gaining control of the conductivity of the HTM in both dye-sensitized and perovskite-absorber solar cells in an inert atmosphere using spiro(TFSI)₂ is an important step toward the commercialization of these technologies.