离子液体在有机光电转换器件中的应用研究进展

doi:10.11896/j.issn.1005-023X.2018.23.013

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Abstract In recent years, ionic liquids have shown wide application potential and prospects because of their physical and chemical properties, such as non-volatile, stability of properties, favorable transmittance, high conductivity, designability, and easy to form electric double layers at the interface. Accordingly, ionic liquids have gradually become one of the frontier and hot spots in international scientific research. Among them, the applications of ionic liquids in organic optoelectronic conversion devices, including dye-sensitized solar cells, perovskite solar cells and organic photodetectors have attracted numerous attention over the world.
In the organic photoelectric conversion devices, the application of ionic liquids in dye-sensitized solar cells is the most extensive and perfect. The high efficiency of dye-sensitized solar cells is primarily depended on liquid electrolyte junctions in organic solvents. Nevertheless, the high photoelectric conversion efficiency benefited from organic solvents is usually accompanied by volatile vaporization, poor photothermal stability, which badly affected the lifetime and long-term stability of dye-sensitized solar cells devices. While the introduction of ionic liquids can effectively solve these problems. In addition, ionic liquids are introduced in the form of electron transport layers and interfacial modification layers, bringing the advantages of high charge mobility, low power function and high stability, which contribute to improving the short-circuit current, filling factor and photoelectric conversion efficiency to a certain extent. As a result, ionic liquids have been recognized as the auxiliary materials with high cost performance ratio, low encapsulation difficulty, excellent performance and good stability in practical application of dye-sensitized solar cells. In perovskite solar cells, the low power function and high electron mobility of ionic liquids and some special properties like passivation reaction, viscosity effect can realize the control of electron extraction rate, charge transfer resistance, perovskite crystallization, so as to meet the design requirements in practice, and further help to improve the photoelectric conversion efficiency and filling factor of perovskite solar cells. Regarding to organic photodetectors, the introduction of ionic liquids can result in the formation of electric double layers at the interface. The formation of electric double layers and the high conductivity of ionic liquids make it possible to produce large photocurrent outputs without the need to illuminate the overlapping region of the upper and lower electrodes of the organic photodetectors. Therefore, it can effectively get rid of the limitation of organic photodetectors on the transmittance of electrode materials, meanwhile, the formation of electric double layers will also promote the charge separation in the working layer of the organic photodetectors, thus further enhance the response rate of the organic photodetectors.
In terms of dye-sensitized solar cells, perovskite solar cells and organic photodetectors, this article reviews the research progress in the application of ionic liquids in organic photoelectric conversion devices at home and abroad. The mechanism of ionic liquids for improving the efficiency of organic photoelectronic conversion and realizing the new function of the devices is analyzed and expounded in detail. The future application and research directions of ionic liquids are proposed, for the sake of providing reference for further design of ionic liquids that are more suitable for the application of organic optoelectronic conversion field in the future.

Key words： ionic liquid photoelectric conversion device organic solar cell photodetector

Published: 20 December 2018

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TB322

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	LI Bo
	XU Xiaoting
	ZHENG Xueqing

Cite this article:

LI Bo,XU Xiaoting,ZHENG Xueqing. Progress in the Application of Ionic Liquids in Organic Photoelectric Conversion Devices[J]. Materials Reports, 2018, 32(23): 4116-4124.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.23.013 OR http://www.mater-rep.com/EN/Y2018/V32/I23/4116

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