Organic-free Anatase TiO2 Paste for Efficient Plastic Dye-Sensitized Solar Cells and Low Temperature Processed Perovskite Solar Cells

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• 作者：Nianqing Fu ; Chun Huang ; Yan Liu ; Xing Li ; Wei Lu ; Limin Zhou ; Feng Peng ; Yanchun Liu ; Haitao Huang
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 2, 2015
• 年：2015
• 卷：7
• 期：34
• 页码：19431-19438
• 全文大小：463K
• ISSN：1944-8252

文摘

Recently, the synthesis of fine TiO₂ paste with organic-free binder emerged as an indispensable technique for plastic photovoltaics due to the low temperature processing requirement. In this study, pure anatase TiO₂ nanoparticles and organic-free TiO₂-sol were successfully synthesized individually in organic-free solution. By mixing the pure anatase TiO₂ with the newly developed TiO₂-sol binder, mechanically robust and well-interconnected TiO₂ films were prepared via UV-irradiation at low temperature for applications in plastic dye-sensitized solar cells (p-DSSCs). The structural, electrical, and photovoltaic properties of the films as well as the devices were investigated by various techniques. The dye-loading amount of the obtained film is 2.6 times that of the P25 electrodes. As revealed by electrochemical impedance spectroscopy results, the film derived from the as-prepared anatase TiO₂ paste (A-TiO₂) exhibits much smaller charge transport resistance and lower electron recombination rate than the P25 film, while the introduction of TiO₂-sol into the paste can further remarkably decrease the resistance of the produced film (AS-TiO₂). The p-DSSCs employing AS-TiO₂ photoanode yield a high efficiency up to 7.51%, which is 86% higher than the P25 reference cells and also 31% higher than the A-TiO₂ cell. As a proof of concept, the newly developed AS-TiO₂ paste was also applied to low temperature processed perovskite solar cells (PSCs), and a promising high efficiency up to 9.95% was achieved.