Stable Quasi-Solid-State Dye-Sensitized Solar Cells Using Novel Low Molecular Mass Organogelators and Room-Temperature Molten Salts

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• 作者：Li Tao ; Zhipeng Huo ; Songyuan Dai ; Yong Ding ; Jun Zhu ; Changneng Zhang ; Bing Zhang ; Jianxi Yao ; Mohammad K. Nazeeruddin ; Michael Gr盲tzel
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：July 31, 2014
• 年：2014
• 卷：118
• 期：30
• 页码：16718-16726
• 全文大小：468K
• ISSN：1932-7455

文摘

Stable quasi-solid-state dye-sensitized solar cells (DSCs) were fabricated by using room-temperature molten salts (1-methyl-3-hexyl-imidazolium iodide), and a series of diamine derivatives with different lengths of alkyl chain as low molecular mass organogelators (LMOGs). The number of methylene (鈭扖H₂鈭? units between the two amide carbonyl groups in the gelator molecule has significant influence on the charge transport property of gel electrolyte, and the kinetic processes of the electron transport and recombination. Less compact networks of the ionic liquid gel electrolytes containing odd-numbered 鈭扖H₂鈥?gelator facilitate the diffusion of I₃^{鈥?/sup> and I鈥?/sup>. Also, the odd-numbered 鈭扖H₂鈥?gelators-based DSCs exhibit longer electron recombination lifetime and a higher open circuit potential (V_oc) compared with the DSCs based on even-numbered 鈭扖H₂鈥?gelators; consequently, the photovoltaic performances of DSCs based on odd-numbered 鈭扖H₂鈥?gelators are much better than those even-numbered 鈭扖H₂鈥?gelators. Remarkably, the results of the accelerated aging tests showed that the ionic liquid gel electrolyte-based DSCs could retain 93%鈥?9% of their initial photoelectric conversion efficiencies (畏) under heat at 60 掳C, and 100% of their initial photoelectric conversion efficiencies under one sun light soaking with UV cutoff filter at 50 掳C for 1000 h. This excellent long-term stability of quasi-solid-state DSCs is very important for application and commercialization of DSCs.}